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This commit is contained in:
Alexander
2026-11-02 23:25:51 +01:00
parent cb5070dc1c
commit f447fe8e51
196 changed files with 5583 additions and 143 deletions
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90
tools/vegetation/download.py Normal file
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"""Fetch reproducible Poly Haven glTF sources and PBR ground materials (CC0)."""
import concurrent.futures, hashlib, json, pathlib, urllib.request, time
ROOT = pathlib.Path(__file__).resolve().parents[2]
DEST = ROOT / 'Content' / 'Vegitations'
ASSETS = ['pine_tree_01', 'fir_tree_01', 'tree_small_02', 'fir_sapling_medium',
'shrub_01', 'shrub_04', 'fern_02', 'grass_medium_01', 'grass_medium_02', 'weed_plant_02']
HEADERS = {'User-Agent': 'UniverseVegetationImporter/1.0 (Poly Haven CC0 asset preparation)'}
def request(url):
return urllib.request.urlopen(urllib.request.Request(url, headers=HEADERS), timeout=120)
def md5(path):
h = hashlib.md5()
with path.open('rb') as f:
for block in iter(lambda: f.read(4*1024*1024), b''): h.update(block)
return h.hexdigest()
def fetch(item):
path = DEST / item['path']
if not path.resolve().is_relative_to(DEST.resolve()): raise RuntimeError('Asset path escapes content folder')
path.parent.mkdir(parents=True, exist_ok=True)
if path.exists() and path.stat().st_size == item['size'] and md5(path) == item['md5']:
return
partial = path.with_suffix(path.suffix + '.partial')
for attempt in range(4):
try:
with request(item['url']) as response, partial.open('wb') as output:
received = 0
while True:
block = response.read(1024*1024)
if not block: break
received += len(block)
if received > item['size']: raise RuntimeError('Download exceeds declared size: '+str(path))
output.write(block)
if partial.stat().st_size != item['size'] or md5(partial) != item['md5']:
raise RuntimeError('Checksum/length mismatch: ' + str(path))
partial.replace(path)
print('Downloaded', item['path'], round(item['size']/1048576, 1), 'MiB', flush=True)
return
except Exception:
if attempt == 3: raise
time.sleep(attempt + 1)
def main():
DEST.mkdir(parents=True, exist_ok=True)
manifest_path = DEST / 'sources.json'
if manifest_path.exists():
manifest = json.loads(manifest_path.read_text())
else:
files = []
for asset in ASSETS:
with request('https://api.polyhaven.com/files/' + asset) as f: data = json.load(f)
model = data['gltf']['2k']['gltf']
entries = {'model.gltf': model, **model.get('include', {})}
for relative, entry in entries.items():
files.append({**{k: entry[k] for k in ('url','size','md5')}, 'path': asset + '/source/' + relative})
# Ground materials share the same biome field as the plants.
for asset in ['forest_ground_04', 'withered_grass', 'snow_02']:
with request('https://api.polyhaven.com/files/' + asset) as f: data = json.load(f)
for kind in ['diff', 'nor_gl', 'rough']:
key = next(k for k in data if k.lower() in ({'diff': ['diff','diffuse'], 'rough':['rough','roughness'], 'nor_gl':['nor_gl']}[kind]))
entry = data[key]['2k']['jpg']
files.append({**{k:entry[k] for k in ('url','size','md5')}, 'path':'ground/'+asset+'/'+kind+'.jpg'})
manifest = {'provider':'Poly Haven', 'license':'CC0', 'source':'https://polyhaven.com', 'files':files}
size = sum(f['size'] for f in files)
if size > 2_000_000_000: raise RuntimeError('Original asset budget exceeded: '+str(size))
manifest_path.write_text(json.dumps(manifest, indent=2)+'\n')
if not manifest.get('foliageMasksIncluded'):
for asset in ASSETS:
with request('https://api.polyhaven.com/files/' + asset) as f: data = json.load(f)
for kind, variants in data.items():
if 'alpha' not in kind.lower() and 'dry_diff' not in kind.lower(): continue
formats=variants.get('2k',{})
extension='png' if 'png' in formats else 'jpg'
if extension not in formats: continue
entry=formats[extension]
manifest['files'].append({**{k:entry[k] for k in ('url','size','md5')},
'path':asset+'/source/masks/'+kind+'.'+extension})
manifest['foliageMasksIncluded']=True
if sum(f['size'] for f in manifest['files'])>2_000_000_000: raise RuntimeError('Asset budget exceeded')
manifest_path.write_text(json.dumps(manifest,indent=2)+'\n')
print('Poly Haven CC0 assets:', len(manifest['files']), 'files,', round(sum(f['size'] for f in manifest['files'])/1048576), 'MiB', flush=True)
if any(f['size']<=0 for f in manifest['files']) or sum(f['size'] for f in manifest['files'])>2_000_000_000:
raise RuntimeError('Source download budget exceeded')
with concurrent.futures.ThreadPoolExecutor(max_workers=3) as executor:
list(executor.map(fetch, manifest['files']))
print('All source checksums verified.', flush=True)
if __name__ == '__main__': main()

738
tools/vegetation/package-lock.json generated Normal file
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@@ -0,0 +1,738 @@
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15
tools/vegetation/package.json Normal file
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@@ -0,0 +1,15 @@
{
"name": "universe-vegetation-preparation",
"private": true,
"type": "module",
"scripts": {
"prepare": "node --max-old-space-size=16384 prepare.mjs"
},
"dependencies": {
"@gltf-transform/core": "^4.5.1",
"@gltf-transform/extensions": "^4.5.1",
"@gltf-transform/functions": "^4.5.1",
"meshoptimizer": "^1.3.0",
"sharp": "^0.35.5"
}
}

143
tools/vegetation/prepare.mjs Normal file
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@@ -0,0 +1,143 @@
import fs from 'node:fs/promises';
import path from 'node:path';
import {fileURLToPath} from 'node:url';
import {NodeIO, Document, getBounds} from '@gltf-transform/core';
import {ALL_EXTENSIONS} from '@gltf-transform/extensions';
import {prune, dedup, flatten, transformMesh, cloneDocument, mergeDocuments, simplify, compactPrimitive, unpartition} from '@gltf-transform/functions';
import {MeshoptSimplifier} from 'meshoptimizer';
import sharp from 'sharp';
const root=path.resolve(path.dirname(fileURLToPath(import.meta.url)),'../../Content/Vegitations');
const manifest=JSON.parse(await fs.readFile(path.join(root,'sources.json'),'utf8'));
const ids=[...new Set(manifest.files.filter(f=>f.path.endsWith('/source/model.gltf')).map(f=>f.path.split('/')[0]))];
const io=new NodeIO().registerExtensions(ALL_EXTENSIONS);
await MeshoptSimplifier.ready;
for(const id of ids) {
const selected=process.argv.slice(2).filter(a=>!a.startsWith('--'));
if(selected.length&&!selected.includes(id))continue;
const out=path.join(root,id,'prepared');await fs.mkdir(out,{recursive:true});
const cards=JSON.parse(await fs.readFile(path.join(out,'cards.json'),'utf8').catch(()=>'null'));
const sourceOnly=process.argv.includes('--source-only');
const stamp=JSON.stringify({version:5,cards:!!cards,files:manifest.files.filter(f=>f.path.startsWith(id+'/')).map(f=>f.md5)});
if(sourceOnly&&await fs.stat(path.join(root,id,'source/bake-source.glb')).catch(()=>null))continue;
if(!sourceOnly&&await fs.readFile(path.join(out,'stamp.json'),'utf8').catch(()=>null)===stamp){console.log('Cached',id);continue;}
console.log('Preparing',id);
const doc=await io.read(path.join(root,id,'source/model.gltf'));
await doc.transform(flatten());
const scene=doc.getRoot().getDefaultScene()??doc.getRoot().listScenes()[0];
const all=scene.listChildren();
const chosen=all.length<=3?all:[all[0],all[Math.floor(all.length/3)],all[Math.floor(all.length*2/3)]];
for(const node of all)if(!chosen.includes(node))node.dispose();
// Apply source transforms and give each variant a gravity-aligned, bottom-centred origin.
for(let i=0;i<chosen.length;i++) {
const node=chosen[i],mesh=node.getMesh();
if(!mesh)throw new Error('Expected a static mesh at root: '+id);
transformMesh(mesh,node.getWorldMatrix());node.setMatrix([1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]);
const b=getBounds(node),offset=[-(b.min[0]+b.max[0])*.5,-b.min[1],-(b.min[2]+b.max[2])*.5];
transformMesh(mesh,[1,0,0,0,0,1,0,0,0,0,1,0,...offset,1]);
node.setName('variant_'+i);
}
if(sourceOnly) {
await doc.transform(unpartition());await io.write(path.join(root,id,'source/bake-source.glb'),doc);
console.log('Prepared full-detail baking source',id);continue;
}
// Dense geometric foliage is baked in small spatial clusters, preserving its volume
// instead of reducing millions of individual needles/leaves to isolated triangles.
if(cards)for(let variant=0;variant<chosen.length;variant++) {
const mesh=chosen[variant].getMesh();
for(const p of [...mesh.listPrimitives()])if(/twig|leaves/.test(p.getMaterial().getName().toLowerCase())){mesh.removePrimitive(p);p.dispose();}
const color=doc.createTexture('canopy').setImage(await fs.readFile(path.join(out,`cards-${variant}-color.png`))).setMimeType('image/png');
const normal=doc.createTexture('canopy_normal').setImage(await fs.readFile(path.join(out,`cards-${variant}-normal.png`))).setMimeType('image/png');
const material=doc.createMaterial('baked_canopy').setBaseColorTexture(color).setNormalTexture(normal)
.setMetallicFactor(0).setRoughnessFactor(.9).setAlphaMode('MASK').setAlphaCutoff(.4).setDoubleSided(true);
const pos=[],norm=[],uv=[],indices=[];
for(const card of cards.Variants[variant]) {
const index=pos.length/3;
for(const [x,y] of [[-.5,-.5],[.5,-.5],[.5,.5],[-.5,.5]]) {
pos.push(...card.Center.map((v,k)=>v+(card.Right[k]*x+card.Up[k]*y)*card.Size));
norm.push(...card.Normal);
uv.push(card.Uv[0]+(x+.5)*card.Uv[2],card.Uv[1]+(.5-y)*card.Uv[3]);
}
indices.push(index,index+1,index+2,index,index+2,index+3);
}
const buffer=doc.getRoot().listBuffers()[0];
const accessor=(type,array)=>doc.createAccessor().setType(type).setArray(array).setBuffer(buffer);
mesh.addPrimitive(doc.createPrimitive().setAttribute('POSITION',accessor('VEC3',new Float32Array(pos)))
.setAttribute('NORMAL',accessor('VEC3',new Float32Array(norm))).setAttribute('TEXCOORD_0',accessor('VEC2',new Float32Array(uv)))
.setIndices(accessor('SCALAR',new Uint32Array(indices))).setMaterial(material));
}
await doc.transform(prune());
const masks=manifest.files.filter(f=>f.path.startsWith(id+'/source/masks/')&&f.path.toLowerCase().includes('alpha'));
for(const material of doc.getRoot().listMaterials()) {
const name=material.getName().toLowerCase();
if(name==='baked_canopy')continue;
const alpha=masks.find(f=>path.basename(f.path).toLowerCase()==='alpha.png'||name.includes(path.basename(f.path).toLowerCase().replace('_alpha.png','')));
const foliage=material.getAlphaMode()!=='OPAQUE'||/twig|leaves|grass|fern|shrub|weed/.test(name);
material.setMetallicFactor(0).setDoubleSided(foliage);
if(foliage&&alpha&&material.getBaseColorTexture()) {
const texture=material.getBaseColorTexture();
const info=await sharp(texture.getImage()).metadata();
const a=await sharp(await fs.readFile(path.join(root,alpha.path))).resize(info.width,info.height).extractChannel(0).toBuffer();
const rgba=await sharp(texture.getImage()).removeAlpha().joinChannel(a).png().toBuffer();
const replacement=doc.createTexture(name+'_alpha').setImage(rgba).setMimeType('image/png');
material.setBaseColorTexture(replacement).setAlphaMode('MASK').setAlphaCutoff(.4);
}
}
const tree=/tree|sapling/.test(id),budgets=tree?[12000,2000,350]:/shrub/.test(id)?[12000,3000,600]:[2500,800,200];
const merged=new Document();const stats=[];
for(let lod=0;lod<3;lod++) {
const copy=cloneDocument(doc),sc=copy.getRoot().listScenes()[0];sc.setName('LOD'+lod);
for(const node of sc.listChildren()) {
const primitives=node.getMesh().listPrimitives();
const total=primitives.reduce((n,p)=>n+(p.getIndices()?.getCount()??p.getAttribute('POSITION').getCount())/3,0);
const canopy=primitives.filter(p=>p.getMaterial().getName()==='baked_canopy').reduce((n,p)=>n+p.getIndices().getCount()/3,0);
for(const p of primitives) {
const count=p.getIndices()?.getCount()??p.getAttribute('POSITION').getCount();
const target=p.getMaterial().getName()==='baked_canopy'?count:Math.max(6,Math.floor((budgets[lod]-canopy)*count/Math.max(1,total-canopy)/3)*3);
if(count<=target)continue;
// The library performs topology/attribute-preserving reduction first.
// simplify() acts on the whole document below; retain the target per primitive for a bounded fallback.
p.setExtras({...p.getExtras(),target});
}
}
let original=0;for(const m of copy.getRoot().listMeshes())for(const p of m.listPrimitives())original+=p.getIndices().getCount()/3;
const retained=[];
for(const mesh of copy.getRoot().listMeshes())for(const p of [...mesh.listPrimitives()])
if(p.getMaterial().getName()==='baked_canopy'){mesh.removePrimitive(p);retained.push([mesh,p]);}
await copy.transform(simplify({simplifier:MeshoptSimplifier,ratio:Math.min(1,budgets[lod]*chosen.length/original),error:.01*(lod+1),lockBorder:false}));
for(const [mesh,p] of retained)mesh.addPrimitive(p);
for(const m of copy.getRoot().listMeshes())for(const p of m.listPrimitives()) {
const indices=new Uint32Array(p.getIndices().getArray()),positions=new Float32Array(p.getAttribute('POSITION').getArray());
const target=p.getExtras().target;
if(target&&indices.length>target*1.1) {
let [reduced]=MeshoptSimplifier.simplify(indices,positions,3,target,1,['Permissive','Prune']);
if(reduced.length>target*1.1)[reduced]=MeshoptSimplifier.simplifySloppy(indices,positions,3,null,target,1);
p.setIndices(copy.createAccessor().setType('SCALAR').setArray(reduced).setBuffer(copy.getRoot().listBuffers()[0]));
compactPrimitive(p);
}
p.setExtras({});
}
await copy.transform(prune());
let triangles=0;for(const m of copy.getRoot().listMeshes())for(const p of m.listPrimitives())triangles+=p.getIndices().getCount()/3;
stats.push(triangles);mergeDocuments(merged,copy);
}
merged.getRoot().setDefaultScene(merged.getRoot().listScenes()[0]);
await merged.transform(dedup(),unpartition(),prune());
for(const ext of merged.getRoot().listExtensionsUsed())ext.dispose();
await io.write(path.join(out,'model.glb'),merged);
const dryFile=manifest.files.find(f=>f.path.startsWith(id+'/source/masks/dry_diff'));
if(dryFile) {
const dry=cloneDocument(merged);
const mask=masks[0];
const image=await sharp(await fs.readFile(path.join(root,dryFile.path))).metadata();
const a=await sharp(await fs.readFile(path.join(root,mask.path))).resize(image.width,image.height).extractChannel(0).toBuffer();
const rgba=await sharp(await fs.readFile(path.join(root,dryFile.path))).removeAlpha().joinChannel(a).png().toBuffer();
const texture=dry.createTexture('dry_grass').setImage(rgba).setMimeType('image/png');
for(const m of dry.getRoot().listMaterials())m.setBaseColorTexture(texture);
await dry.transform(prune());await io.write(path.join(out,'dry.glb'),dry);
}
const variantBounds=chosen.map(n=>getBounds(n));
await fs.writeFile(path.join(out,'preparation.json'),JSON.stringify({source:'https://polyhaven.com/a/'+id,license:'CC0',budgets,triangles:stats,variants:variantBounds},null,2));
await fs.writeFile(path.join(out,'stamp.json'),stamp);
console.log('Prepared',id,stats);
}