680 lines
28 KiB
Python
680 lines
28 KiB
Python
#!/usr/bin/env python3
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"""Minecraft and MIAPI geometry, read out of jars and turned into textured quads.
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This is the part of the armour tooling that has to be *right* rather than
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merely plausible: everything downstream is just a camera pointed at whatever
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this module says the shape is. So the two UV conventions Minecraft uses are
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both implemented here, separately and by name, rather than being averaged into
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one that is wrong for half the models:
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*Entity cubes* (`ModelPart.Cube`) are what vanilla armour is. Boxes are given a
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single texture offset and the six faces are laid out around it in the familiar
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cross; +y is down, because entity model space is flipped once more at draw
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time. `vanilla_armour` builds these.
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*JSON model faces* (`FaceBakery`) are what every MIAPI module is - a Blockbench
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item model with a `uv` rectangle written out per face. The two conventions
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disagree about which end of the rectangle is which on four of the six faces,
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which is exactly the sort of difference that survives a careless eyeball on a
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symmetrical breastplate and then ruins a pauldron.
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Everything is in model pixels: +x is the wearer's left, +y is down, -z is
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forward, and the origin of each part is its `HumanoidModel` pivot. Nothing
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converts between "item space" and "entity space", because MIAPI does not
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either - Armory's slot transforms carry an explicit `"rotation": {"z": 180}`
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to flip a model onto a body part, and that flip is the whole conversion.
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"""
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from __future__ import annotations
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import colorsys
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import io
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import json
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import math
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import os
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import zipfile
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from dataclasses import dataclass
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import numpy as np
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from PIL import Image
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# --------------------------------------------------------------------- resources
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class Resources:
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"""Jars and loose directories, searched in the order they were given.
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A resource pack and a mod jar are the same thing to this: somewhere an
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`assets/<namespace>/...` path can be read from. Directories are listed
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first when the same file is in both, so the repo's own assets win over the
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copy inside a built jar.
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"""
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def __init__(self, sources):
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self.dirs, self.zips, self.names = [], [], []
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for src in sources:
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src = os.path.expanduser(str(src))
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if os.path.isdir(src):
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self.dirs.append(src)
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elif os.path.isfile(src):
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self.zips.append(zipfile.ZipFile(src))
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else:
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raise FileNotFoundError(src)
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self.names.append(os.path.basename(src.rstrip('/')))
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def read(self, path):
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"""Bytes at an exact `assets/...` or `data/...` path."""
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for d in self.dirs:
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full = os.path.join(d, path)
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if os.path.isfile(full):
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return open(full, 'rb').read()
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for z in self.zips:
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try:
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return z.read(path)
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except KeyError:
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pass
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raise KeyError(path)
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def json(self, path):
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return json.loads(self.read(path))
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# MIAPI writes model references two ways. A module's `model` entry gives a
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# whole path - "miapi:models/item/foo/[material.texture].json" - while a
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# model's own `parent` gives the short form the game uses, "item/generated".
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def model_path(self, ref, variant='default'):
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ns, _, rest = ref.partition(':')
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if not _:
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ns, rest = 'minecraft', ref
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rest = rest.replace('[material.texture]', variant)
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if not rest.startswith('models/'):
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rest = 'models/' + rest
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if not rest.endswith('.json'):
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rest += '.json'
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return f'assets/{ns}/{rest}'
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def model(self, ref, variant='default'):
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"""A model with its parent chain already folded in."""
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model = self.json(self.model_path(ref, variant))
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chain = [model]
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seen = set()
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while 'parent' in chain[-1]:
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parent = chain[-1]['parent']
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if parent in seen:
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break
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seen.add(parent)
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try:
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chain.append(self.json(self.model_path(parent, variant)))
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except KeyError:
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# item/generated and item/handheld are builtins with no file.
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break
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out = {'textures': {}, 'parents': [c.get('parent') for c in chain]}
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for part in reversed(chain):
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out['textures'].update(part.get('textures', {}))
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for key in ('elements', 'texture_size', 'display'):
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if key in part:
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out[key] = part[key]
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return out
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def paths(self, prefix='', suffix='', loose=False):
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"""Every path in the sources between a prefix and a suffix, sorted.
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For finding what is there rather than reading what you already knew
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about. Duplicates collapse the way `read` resolves them - one path,
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whichever source answers for it first. `loose` limits the answer to
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files on disk, for a caller that means the working tree rather than
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whatever a build happened to zip up.
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"""
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found = set()
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for d in self.dirs:
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root = os.path.join(d, prefix)
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start = root if os.path.isdir(root) else os.path.dirname(root)
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for base, _dirs, files in os.walk(start):
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rel = os.path.relpath(base, d)
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found.update(f'{rel}/{f}' for f in files
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if f'{rel}/{f}'.startswith(prefix) and f.endswith(suffix))
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for z in ([] if loose else self.zips):
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found.update(n for n in z.namelist()
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if n.startswith(prefix) and n.endswith(suffix))
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return sorted(found)
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def image(self, ref):
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"""A texture as RGBA. `ref` is a namespaced texture id, no extension."""
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ns, _, rest = ref.partition(':')
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if not _:
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ns, rest = 'minecraft', ref
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if rest.startswith('textures/'):
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rest = rest[len('textures/'):]
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data = self.read(f'assets/{ns}/textures/{rest}.png')
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return Image.open(io.BytesIO(data)).convert('RGBA')
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# ------------------------------------------------------------------- transforms
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#
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# MIAPI's Transform, reproduced including the part of it that loses information.
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def ident():
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return np.eye(4)
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def translate(t):
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m = np.eye(4)
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m[:3, 3] = t
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return m
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def scale(s):
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m = np.eye(4)
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m[0, 0], m[1, 1], m[2, 2] = s
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return m
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def rot(axis, deg):
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a = math.radians(deg)
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c, s = math.cos(a), math.sin(a)
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m = np.eye(4)
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if axis == 'x':
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m[1, 1], m[1, 2], m[2, 1], m[2, 2] = c, -s, s, c
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elif axis == 'y':
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m[0, 0], m[0, 2], m[2, 0], m[2, 2] = c, s, -s, c
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else:
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m[0, 0], m[0, 1], m[1, 0], m[1, 1] = c, -s, s, c
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return m
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def transform_matrix(tr):
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"""MIAPI's `Transform.toMatrix`: T * Rx * Ry * Rz * S, translation in pixels."""
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tr = tr or {}
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def g(key, axis, dflt):
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sub = tr.get(key)
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return float(sub.get(axis, dflt)) if isinstance(sub, dict) else dflt
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m = translate([g('translation', a, 0.0) for a in 'xyz'])
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for axis in 'xyz':
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m = m @ rot(axis, g('rotation', axis, 0.0))
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return m @ scale([g('scale', a, 1.0) for a in 'xyz'])
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def decompose(m):
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"""MIAPI's `Transform.fromMatrix`: translation, XYZ Euler, per-column scale.
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Shear in the product is dropped on the floor. That is not a bug here - it
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is what the mod does, and reproducing it is the only way the preview agrees
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with the game once a rotation meets a non-uniform scale.
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"""
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t = m[:3, 3]
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cols = [m[:3, c] for c in range(3)]
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s = [float(np.linalg.norm(c)) or 1.0 for c in cols]
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r = np.column_stack([cols[c] / s[c] for c in range(3)])
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y = math.asin(max(-1.0, min(1.0, float(r[0, 2]))))
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x = math.atan2(-float(r[1, 2]), float(r[2, 2]))
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z = math.atan2(-float(r[0, 1]), float(r[0, 0]))
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return {'translation': {'x': float(t[0]), 'y': float(t[1]), 'z': float(t[2])},
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'rotation': {'x': math.degrees(x), 'y': math.degrees(y), 'z': math.degrees(z)},
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'scale': {'x': s[0], 'y': s[1], 'z': s[2]}}
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def merge(parent, child, lossy=False):
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"""MIAPI's `Transform.merge`.
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In 1.21 this is a plain matrix multiply - `Transform` holds a `Matrix4f`
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and `merge` returns `new Transform(parent.matrix.mul(child.matrix))`, with
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no round trip through Euler angles. The parent is the transform already
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accumulated and the child the one being added, so the child applies first.
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`lossy` reproduces the older behaviour, where the product was decomposed
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back into translation, Euler angles and scale before being stored - which
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silently drops the shear that appears the moment a rotation meets a
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non-uniform scale. Armory's limb slots are exactly that, so the two answers
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differ there and it is worth being able to see both.
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"""
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product = child @ parent
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return transform_matrix(decompose(product)) if lossy else product
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# `HumanoidModel.createMesh` pivots - the frame each `origin` resolves against.
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PIVOTS = {
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'head': (0.0, 0.0, 0.0),
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'hat': (0.0, 0.0, 0.0),
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'body': (0.0, 0.0, 0.0),
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'item': (0.0, 0.0, 0.0),
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'left_arm': (5.0, 2.0, 0.0),
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'right_arm': (-5.0, 2.0, 0.0),
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'left_leg': (1.9, 12.0, 0.0),
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'right_leg': (-1.9, 12.0, 0.0),
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}
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# ----------------------------------------------------------------------- quads
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@dataclass
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class Quad:
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"""Four corners, four texture coordinates, and the texture they index.
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`shape` is which box of its model the face belongs to and `face` is which
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of the six it is. Neither matters for drawing a textured model, but both
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are what lets the untextured view and the unwrap template agree on a
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colour, which is the only thing making one a legend for the other.
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"""
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pts: np.ndarray # (4, 3) model pixels
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uv: np.ndarray # (4, 2) normalised, v measured down from the top
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texture: str | None # namespaced texture id
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shape: int = 0
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face: str = ''
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def transformed(self, m, offset=(0.0, 0.0, 0.0)):
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pts = np.column_stack([self.pts, np.ones(4)]) @ m.T
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return Quad(pts[:, :3] + np.asarray(offset, float), self.uv, self.texture,
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self.shape, self.face)
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# ------------------------------------------------------------------- colouring
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#
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# One hue per shape, one shade per face. The hue says which box you are looking
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# at and the shade says which side of it, so a patch of texture can be found on
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# the model - and a face drawn on the wrong patch shows up as the wrong shade of
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# the right colour rather than as something that looks fine.
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# Saturation and value per face. Front and back are the vivid pair because they
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# are what you look at most; up and down are pushed to the ends of the value
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# range so a box read from above or below is never ambiguous. Entity cubes name
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# their vertical faces differently, and both names are here rather than
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# translated, so neither convention has to know about the other.
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FACE_SHADES = {
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'north': (0.90, 0.98), 'south': (0.90, 0.60),
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'east': (0.55, 0.90), 'west': (0.55, 0.68),
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'up': (0.26, 1.00), 'down': (1.00, 0.42),
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'top': (0.26, 1.00), 'bottom': (1.00, 0.42),
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}
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def shape_hues(count):
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"""The colour wheel split evenly, one slice per shape."""
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count = max(1, int(count))
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return [i / count for i in range(count)]
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def face_colour(shape, count, face):
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"""The colour of one face of one shape, as floats in 0..1."""
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hues = shape_hues(count)
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hue = hues[int(shape) % len(hues)]
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sat, val = FACE_SHADES.get(face, (0.70, 0.80))
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return colorsys.hsv_to_rgb(hue, sat, val)
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# uv index 0..3 is (u1,v1), (u1,v2), (u2,v2), (u2,v1) - `BlockFaceUV.getU/getV`.
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# Each entry picks x, y and z from (from, to) per corner: 0 is `from`, 1 is `to`.
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_JSON_FACE = {
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'north': ((1, 1, 0), (1, 0, 0), (0, 0, 0), (0, 1, 0)),
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'south': ((0, 1, 1), (0, 0, 1), (1, 0, 1), (1, 1, 1)),
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'west': ((0, 1, 0), (0, 0, 0), (0, 0, 1), (0, 1, 1)),
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'east': ((1, 1, 1), (1, 0, 1), (1, 0, 0), (1, 1, 0)),
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'up': ((0, 1, 0), (0, 1, 1), (1, 1, 1), (1, 1, 0)),
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'down': ((0, 0, 1), (0, 0, 0), (1, 0, 0), (1, 0, 1)),
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}
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# The two axes a face's uv rectangle runs along, for the auto-uv Minecraft
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# generates when a face omits `uv`: (u axis, v axis) as (index, flipped).
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_AUTO_UV = {
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'north': ((0, True), (1, True)), 'south': ((0, False), (1, True)),
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'west': ((2, False), (1, True)), 'east': ((2, True), (1, True)),
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'up': ((0, False), (2, False)), 'down': ((0, False), (2, True)),
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}
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def _resolve_texture(textures, key):
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"""Follow `#2` -> `#layer0` -> `miapi:item/...` to a real texture id."""
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seen = 0
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while isinstance(key, str) and key.startswith('#') and seen < 8:
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key = textures.get(key[1:])
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seen += 1
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return key
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def _element_matrix(el):
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"""A JSON element's own `rotation`, about its own origin."""
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r = el.get('rotation')
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if not r:
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return np.eye(4)
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axis, angle = r.get('axis', 'y'), float(r.get('angle', 0.0))
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origin = np.asarray(r.get('origin', [0, 0, 0]), float)
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m = translate(origin) @ rot(axis, angle) @ translate(-origin)
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if r.get('rescale') and angle:
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f = 1.0 / math.cos(math.radians(abs(angle)))
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s = [f, f, f]
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s['xyz'.index(axis)] = 1.0
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m = m @ (translate(origin) @ scale(s) @ translate(-origin))
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return m
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def model_quads(model, res=None, y_up=False):
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"""Every drawable face of a parsed JSON model, in the model's own pixels.
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A model with no `elements` whose ancestry runs through `item/generated` is
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a flat sprite, and is turned into a two-sided slab centred on the origin -
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which is what a gemstone is, and why a gem's position is a point rather
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than a plate.
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"""
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textures = model.get('textures', {})
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elements = model.get('elements')
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if not elements:
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return _sprite_quads(textures, res, y_up)
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tw, th = (model.get('texture_size') or [16, 16])[:2]
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quads = []
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for index, el in enumerate(elements):
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lo = np.asarray(el['from'], float)
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hi = np.asarray(el['to'], float)
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bounds = np.column_stack([lo, hi]) # (3, 2): axis -> (from, to)
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m = _element_matrix(el)
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for name, face in (el.get('faces') or {}).items():
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picks = _JSON_FACE.get(name)
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if picks is None:
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continue
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uv = face.get('uv')
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if uv is None:
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uv = _auto_uv(name, lo, hi)
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u1, v1, u2, v2 = (float(x) for x in uv)
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corners = [(u1, v1), (u1, v2), (u2, v2), (u2, v1)]
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turns = int(face.get('rotation', 0) // 90) % 4
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if turns:
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corners = corners[turns:] + corners[:turns]
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pts = np.array([[bounds[a][p[a]] for a in range(3)] for p in picks], float)
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pts = (np.column_stack([pts, np.ones(4)]) @ m.T)[:, :3]
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quads.append(Quad(pts,
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np.array([[u / tw, v / th] for u, v in corners]),
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_resolve_texture(textures, face.get('texture', '#0')),
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index, name))
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return quads
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def _auto_uv(name, lo, hi):
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(ui, uflip), (vi, vflip) = _AUTO_UV[name]
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a, b = (16 - hi[ui], 16 - lo[ui]) if uflip else (lo[ui], hi[ui])
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c, d = (16 - hi[vi], 16 - lo[vi]) if vflip else (lo[vi], hi[vi])
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return [a, c, b, d]
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def _sprite_quads(textures, res=None, y_up=False):
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"""An `item/generated` sprite: a two-sided slab, front and back.
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Trimmed to the sprite's opaque pixels rather than left at the full 16x16,
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because that is what the module actually is - a medium gemstone is two
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pixels of gem in the middle of fourteen of nothing, and a placement judged
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against the empty square around it is judged against the wrong thing.
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Centred on the origin, because MIAPI places one by its middle: a gemstone
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sits where its slot's translation points, not 8 pixels down and left of it.
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`y_up` builds it in item space instead. Worn armour is drawn with +y down -
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that is what the `"rotation": {"z": 180}` on every armour slot is for - but
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an inventory icon is a plain item model, where +y is up and the sprite's top
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row is at the top. Armory's belt gem settles which is which: its slot names
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no origin, so it reaches the icon, and `y: 4` puts it on the buckle, which
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the art draws four pixels above the middle.
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"""
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tex = _resolve_texture(textures, '#layer0') or _resolve_texture(textures, '#0')
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x0, y0, x1, y1 = -8.0, -8.0, 8.0, 8.0
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u0, v0, u1, v1 = 0.0, 0.0, 1.0, 1.0
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if res is not None and tex:
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try:
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image = res.image(tex)
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except KeyError:
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image = None
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box = image.split()[3].getbbox() if image is not None else None
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if box:
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w, h = image.size
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u0, u1 = box[0] / w, box[2] / w
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v0, v1 = box[1] / h, box[3] / h
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# The sprite spans 16 model pixels whatever its resolution.
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x0, x1 = u0 * 16.0 - 8.0, u1 * 16.0 - 8.0
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y0, y1 = v0 * 16.0 - 8.0, v1 * 16.0 - 8.0
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if y_up:
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y0, y1 = -y1, -y0
|
|
uv_top, uv_bottom = v1, v0 # texture top is now the larger y
|
|
else:
|
|
uv_top, uv_bottom = v0, v1
|
|
v0, v1 = uv_top, uv_bottom
|
|
|
|
front = np.array([[x0, y0, -0.5], [x0, y1, -0.5], [x1, y1, -0.5], [x1, y0, -0.5]])
|
|
back = np.array([[x1, y0, 0.5], [x1, y1, 0.5], [x0, y1, 0.5], [x0, y0, 0.5]])
|
|
uv_f = np.array([[u0, v0], [u0, v1], [u1, v1], [u1, v0]])
|
|
uv_b = np.array([[u1, v0], [u1, v1], [u0, v1], [u0, v0]])
|
|
return [Quad(front, uv_f, tex, 0, 'north'), Quad(back, uv_b, tex, 0, 'south')]
|
|
|
|
|
|
# ------------------------------------------------------------- vanilla armour
|
|
#
|
|
# `ModelPart.Cube`'s layout, which is the other convention and the reference
|
|
# this whole tool is checked against.
|
|
|
|
# Per face: the corner picks, and which slice of the texture cross it takes.
|
|
# Regions are named by the offsets vanilla computes - f9..f14 across, f15..f17
|
|
# down - so the table can be read against the source it came from.
|
|
_CUBE_FACE = {
|
|
'top': (((1, 0, 1), (0, 0, 1), (0, 0, 0), (1, 0, 0)), ('f10', 'f15', 'f11', 'f16')),
|
|
'bottom': (((1, 1, 0), (0, 1, 0), (0, 1, 1), (1, 1, 1)), ('f11', 'f16', 'f12', 'f15')),
|
|
'west': (((0, 0, 0), (0, 0, 1), (0, 1, 1), (0, 1, 0)), ('f9', 'f16', 'f10', 'f17')),
|
|
'north': (((1, 0, 0), (0, 0, 0), (0, 1, 0), (1, 1, 0)), ('f10', 'f16', 'f11', 'f17')),
|
|
'east': (((1, 0, 1), (1, 0, 0), (1, 1, 0), (1, 1, 1)), ('f11', 'f16', 'f13', 'f17')),
|
|
'south': (((0, 0, 1), (1, 0, 1), (1, 1, 1), (0, 1, 1)), ('f13', 'f16', 'f14', 'f17')),
|
|
}
|
|
|
|
|
|
def cube_quads(origin, size, tex_offs, grow=0.0, mirror=False,
|
|
tex_size=(64, 32), texture=None, shape=0):
|
|
"""One entity cube, the way `ModelPart.Cube` builds it.
|
|
|
|
`origin` and `size` are the arguments of `CubeListBuilder.addBox`, `grow`
|
|
the `CubeDeformation`. The uv rectangle is measured from the undeformed
|
|
size, which is why an inflated armour layer still lines up with the skin
|
|
it is drawn over.
|
|
"""
|
|
ox, oy, oz = (float(v) for v in origin)
|
|
dx, dy, dz = (float(v) for v in size)
|
|
x1, y1, z1 = ox - grow, oy - grow, oz - grow
|
|
x2, y2, z2 = ox + dx + grow, oy + dy + grow, oz + dz + grow
|
|
if mirror:
|
|
x1, x2 = x2, x1
|
|
bounds = ((x1, x2), (y1, y2), (z1, z2))
|
|
|
|
u, v = float(tex_offs[0]), float(tex_offs[1])
|
|
reg = {'f9': u, 'f10': u + dz, 'f11': u + dz + dx, 'f12': u + dz + dx + dx,
|
|
'f13': u + dz + dx + dz, 'f14': u + dz + dx + dz + dx,
|
|
'f15': v, 'f16': v + dz, 'f17': v + dz + dy}
|
|
tw, th = tex_size
|
|
|
|
quads = []
|
|
for name, (picks, (ua, va, ub, vb)) in _CUBE_FACE.items():
|
|
u0, v0, u1_, v1_ = reg[ua], reg[va], reg[ub], reg[vb]
|
|
# vertex order is [0]->(u1,v0) [1]->(u0,v0) [2]->(u0,v1) [3]->(u1,v1)
|
|
corners = [(u1_, v0), (u0, v0), (u0, v1_), (u1_, v1_)]
|
|
pts = np.array([[bounds[a][p[a]] for a in range(3)] for p in picks], float)
|
|
quads.append(Quad(pts, np.array([[cu / tw, cv / th] for cu, cv in corners]),
|
|
texture, shape, name))
|
|
return quads
|
|
|
|
|
|
# `HumanoidModel.createMesh`: box origin, box size, texture offset, mirrored.
|
|
HUMANOID = {
|
|
'head': ((-4, -8, -4), (8, 8, 8), (0, 0), False),
|
|
'hat': ((-4, -8, -4), (8, 8, 8), (32, 0), False),
|
|
'body': ((-4, 0, -2), (8, 12, 4), (16, 16), False),
|
|
'right_arm': ((-3, -2, -2), (4, 12, 4), (40, 16), False),
|
|
'left_arm': ((-1, -2, -2), (4, 12, 4), (40, 16), True),
|
|
'right_leg': ((-2, 0, -2), (4, 12, 4), (0, 16), False),
|
|
'left_leg': ((-2, 0, -2), (4, 12, 4), (0, 16), True),
|
|
}
|
|
|
|
# Which parts each vanilla armour slot draws, and how far each layer is
|
|
# inflated - `HumanoidArmorModel`'s inner and outer `CubeDeformation`.
|
|
ARMOUR_PIECES = {
|
|
'helmet': (('head', 'hat'), 1.0, 1),
|
|
'chestplate': (('body', 'left_arm', 'right_arm'), 1.0, 1),
|
|
'leggings': (('body', 'left_leg', 'right_leg'), 0.5, 2),
|
|
'boots': (('left_leg', 'right_leg'), 1.0, 1),
|
|
}
|
|
|
|
|
|
def vanilla_armour(piece, texture, tex_size=(64, 32)):
|
|
"""A vanilla armour piece as world-space quads, ready to draw.
|
|
|
|
The point of this is that its answer is already known. Iron leggings look
|
|
like iron leggings or the renderer is wrong, and there is no MIAPI, no
|
|
transform stack and no module JSON in the way of finding out which.
|
|
"""
|
|
parts, grow, _ = ARMOUR_PIECES[piece]
|
|
quads = []
|
|
for shape, part in enumerate(parts):
|
|
origin, size, offs, mirror = HUMANOID[part]
|
|
# The hat is a second, slightly larger skin on the head; a helmet is
|
|
# already the inflated head, so it takes vanilla's extra 0.5 as well.
|
|
g = grow + 0.5 if part == 'hat' else grow
|
|
pivot = PIVOTS[part]
|
|
quads += [q.transformed(np.eye(4), pivot)
|
|
for q in cube_quads(origin, size, offs, g, mirror, tex_size,
|
|
texture, shape)]
|
|
return quads
|
|
|
|
|
|
def humanoid_body(texture=None, tex_size=(64, 64)):
|
|
"""The wearer, as a reference figure to judge a placement against."""
|
|
quads = []
|
|
for shape, (part, (origin, size, offs, mirror)) in enumerate(HUMANOID.items()):
|
|
if part == 'hat':
|
|
continue
|
|
quads += [q.transformed(np.eye(4), PIVOTS[part])
|
|
for q in cube_quads(origin, size, offs, 0.0, mirror, tex_size,
|
|
texture, shape)]
|
|
return quads
|
|
|
|
|
|
# ------------------------------------------------------------------- unwrapping
|
|
#
|
|
# Box UV, the layout Blockbench calls "Box UV" and Minecraft's entity cubes use:
|
|
#
|
|
# [up ][dn ]
|
|
# [west][north][east][south]
|
|
#
|
|
# A box needs (2*dz + 2*dx) across and (dz + dy) down. Faces are written back as
|
|
# explicit per-face `uv` rectangles, because that is the only thing the JSON
|
|
# model format can say - `texture_size` scales them, nothing else.
|
|
|
|
def texel_size(lo, hi):
|
|
"""A box's dimensions in whole texels, which is the only size a patch has.
|
|
|
|
Rounded up and never zero: a bezel half a pixel thick still needs a row of
|
|
texture to be painted on, and a face allotted 0.5 of a texel is a face that
|
|
cannot be drawn and, on the way there, a rectangle PIL refuses to fill.
|
|
"""
|
|
return tuple(max(1, int(math.ceil(round(abs(float(b) - float(a)), 4))))
|
|
for a, b in zip(lo, hi))
|
|
|
|
|
|
def net_size(lo, hi):
|
|
"""The width and height one box's net needs, in texture pixels."""
|
|
dx, dy, dz = texel_size(lo, hi)
|
|
return (2 * dz + 2 * dx, dz + dy)
|
|
|
|
|
|
def _net_faces(u, v, dx, dy, dz):
|
|
"""Where each face lands in a net whose top-left corner is (u, v)."""
|
|
return {
|
|
'up': (u + dz, v, u + dz + dx, v + dz),
|
|
'down': (u + dz + dx, v, u + dz + dx + dx, v + dz),
|
|
'west': (u, v + dz, u + dz, v + dz + dy),
|
|
'north': (u + dz, v + dz, u + dz + dx, v + dz + dy),
|
|
'east': (u + dz + dx, v + dz, u + dz + dx + dz, v + dz + dy),
|
|
'south': (u + dz + dx + dz, v + dz, u + dz + dx + dz + dx, v + dz + dy),
|
|
}
|
|
|
|
|
|
def unwrap(elements, texture=None, padding=0, atlas_width=None):
|
|
"""Give every face of every element its own patch of texture.
|
|
|
|
Shelf-packs one net per element, tallest first, and writes the resulting
|
|
rectangles back into each face's `uv`. Returns the atlas size the caller
|
|
should put in `texture_size`, and the placement of each element so a
|
|
template can be drawn to match.
|
|
|
|
Nothing here is clever about sharing texture between identical faces. That
|
|
is deliberate: a shared patch is a patch you cannot edit on one face
|
|
without editing the other, and this exists so that faces can be painted.
|
|
"""
|
|
nets = []
|
|
for i, el in enumerate(elements):
|
|
lo, hi = el['from'], el['to']
|
|
dx, dy, dz = texel_size(lo, hi)
|
|
w, h = net_size(lo, hi)
|
|
nets.append({'index': i, 'dx': dx, 'dy': dy, 'dz': dz,
|
|
'w': w + 2 * padding, 'h': h + 2 * padding})
|
|
|
|
widest = max((n['w'] for n in nets), default=1.0)
|
|
total = sum(n['w'] * n['h'] for n in nets) or 1.0
|
|
if atlas_width is None:
|
|
# Wide enough for the widest net, and roughly square overall.
|
|
atlas_width = max(widest, math.sqrt(total) * 1.3)
|
|
atlas_width = 1 << max(0, math.ceil(math.log2(max(1.0, atlas_width))))
|
|
|
|
# Shelves: tallest first so a short net never strands a tall one.
|
|
shelf_x, shelf_y, shelf_h = 0.0, 0.0, 0.0
|
|
for net in sorted(nets, key=lambda n: -n['h']):
|
|
if shelf_x + net['w'] > atlas_width and shelf_x > 0:
|
|
shelf_y += shelf_h
|
|
shelf_x, shelf_h = 0.0, 0.0
|
|
net['u'], net['v'] = shelf_x + padding, shelf_y + padding
|
|
shelf_x += net['w']
|
|
shelf_h = max(shelf_h, net['h'])
|
|
height = shelf_y + shelf_h
|
|
atlas_height = 1 << max(0, math.ceil(math.log2(max(1.0, height))))
|
|
|
|
for net in nets:
|
|
el = elements[net['index']]
|
|
rects = _net_faces(net['u'], net['v'], net['dx'], net['dy'], net['dz'])
|
|
faces = el.setdefault('faces', {})
|
|
for name, rect in rects.items():
|
|
face = faces.get(name)
|
|
if face is None:
|
|
face = {'texture': texture or '#0'}
|
|
faces[name] = face
|
|
face['uv'] = [round(c, 4) for c in rect]
|
|
face.pop('rotation', None)
|
|
if texture:
|
|
face['texture'] = texture
|
|
return (atlas_width, atlas_height), nets
|
|
|
|
|
|
def unwrap_template(size, nets, elements, labelled=True):
|
|
"""A painting guide for an unwrap: one coloured, labelled patch per face.
|
|
|
|
The colours are the ones the untextured viewport uses - hue per shape,
|
|
shade per face - so the model on screen is the legend for this sheet.
|
|
Find the colour on the model, find the same colour here, and that is the
|
|
patch to paint.
|
|
|
|
Doubles as the check on the unwrap itself. Render a model with this as its
|
|
texture and every face should show its own colour, its own letter, and the
|
|
letter the right way up; anything else is a uv routed to the wrong place.
|
|
"""
|
|
from PIL import Image, ImageDraw
|
|
|
|
img = Image.new('RGBA', (int(size[0]), int(size[1])), (0, 0, 0, 0))
|
|
d = ImageDraw.Draw(img)
|
|
count = len(elements)
|
|
for net in nets:
|
|
rects = _net_faces(net['u'], net['v'], net['dx'], net['dy'], net['dz'])
|
|
for name, (u0, v0, u1, v1) in rects.items():
|
|
if u1 <= u0 or v1 <= v0:
|
|
continue
|
|
tint = tuple(int(round(c * 255))
|
|
for c in face_colour(net['index'], count, name))
|
|
d.rectangle([u0, v0, u1 - 1, v1 - 1], fill=tint + (255,))
|
|
# A darker top edge and left edge, so the patch has an up and a left.
|
|
shade = tuple(int(c * 0.62) for c in tint)
|
|
d.line([(u0, v0), (u1 - 1, v0)], fill=shade + (255,))
|
|
d.line([(u0, v0), (u0, v1 - 1)], fill=shade + (255,))
|
|
if labelled and (u1 - u0) >= 3 and (v1 - v0) >= 5:
|
|
d.text((u0 + 1, v0 + 1), name[0].upper(), fill=(20, 20, 24, 255))
|
|
return img
|