feat: 树渲染改用 apple/fattree 模型，修复 Cesium alpha 抠图丢失
tree_style 新增 apple（SpeedTree Red Delicious，4475 tris，alpha 抠图叶片 + 法线贴图）和 fattree（低面数卡通树，2238 tris，实体几何）。 高度改为按模型自身包围盒归一化到目标高度，树根落在 z=0，不再用魔数； 每棵树按序号做确定性抖动（缩放 ±14%、黄金角偏航、±3° 倾斜）， tree_row 采样高度全部相同，不抖动就是同一棵树盖章 156 次。 移除 polyhaven 样式和 island_tree_01 资产（76MB）+ ingest_tree.py： 该样式 append 的 *_LOD1 并不是完整的树，枝干只有 0.41 单位高，叶片是 挂在原点下方的平面簇，本是给源文件几何节点散布用的碎片。 Cesium 侧修三处： - make_export_material 把 Alpha 恒定写死为 1.0，叶片卡片整块导出，而 SpeedTree 图集抠掉的区域是纯黑，在 Cesium 里就是黑色色块。 - Blender 4.2 起 glTF 导出不再读 blend_method（仍可写但已失效，写 CLIP 读回来是 HASHED），改为从节点树推断 alpha 模式，alpha 直连 BSDF 会落到 BLEND。新增 materials.link_alpha_clip() 构造导出器识别的 1 - (alpha < cutoff) 结构，得到 alphaMode=MASK。 - 新增 alpha_dilated_image()：把不透明像素颜色向抠图区域外扩 8 圈， 避免 mipmap 把黑色平均进叶缘。叶缘相邻的纯黑像素 10.3% → 0.6%。 另修两个既有 bug： - 材质槽在 mesh 上，181 棵树共享一个 datablock，第一棵替换后其余会把结果 再包一层，产生 Cesium Cesium Cesium... 的材质名；烘焙图缓存按材质名索引， 每轮再嵌一份同样的贴图。GLB 22.46MB → 20.76MB，materials 270 → 23。 - shrub_02 从 glTF 带进来一个 Math 节点接在 Alpha 上，但其 JPEG 贴图 alpha 全是 1.0，只判断「连了 Alpha」会误判为抠图材质。 模型资产为第三方素材，已 gitignore，缺失时回落到 natural； 来源见 assets/models/SOURCES.md。 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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"""Import Poly Haven island_tree_01 and export decimated GLBs.
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Each output GLB is a single tree variant (branch + leaf) with shared
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material references. This is the offline ingest tool; the runtime module
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(osmassets/tree.py) loads directly from the vendored .blend via wm.append.
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"""
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import math
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import os
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import sys
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import bpy
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TREE_BLEND = os.path.join(
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os.path.dirname(os.path.abspath(__file__)), "..", "..",
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"assets", "models", "polyhaven", "island_tree_01",
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"island_tree_01_1k.blend",
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)
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# Target triangle counts for the decimated per-tree mesh.
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# LOD1 branches are 135-570 tris, LOD1 leaves 380-1531 tris.
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# 180 + 220 = 400 per tree, on par with the procedural trees.
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TARGET_BRANCH_TRIS = 180
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TARGET_LEAF_TRIS = 220
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# Branch / leaf LOD1 pairings for the four variants.
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PAIRS = [("a", "b"), ("b", "a"), ("c", "a"), ("d", "b")]
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def cli_args():
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values = {"out": None}
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argv = sys.argv[sys.argv.index("--") + 1:] if "--" in sys.argv else []
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i = 0
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while i < len(argv):
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if argv[i].startswith("--") and i + 1 < len(argv):
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values[argv[i][2:]] = argv[i + 1]
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i += 2
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else:
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i += 1
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if not values.get("out"):
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raise RuntimeError("--out is required")
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return values
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def decimate_to_target(obj, target_tris):
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"""Decimate a mesh to roughly target_tris, return new mesh datablock."""
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source = obj.data
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source.calc_loop_triangles()
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source_tris = len(source.loop_triangles)
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if source_tris <= target_tris:
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return source.copy()
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modifier = obj.modifiers.new("TreeDecimate", "DECIMATE")
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modifier.ratio = max(0.05, target_tris / source_tris)
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bpy.context.view_layer.update()
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depsgraph = bpy.context.evaluated_depsgraph_get()
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evaluated = obj.evaluated_get(depsgraph)
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result = bpy.data.meshes.new_from_object(evaluated)
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result.calc_loop_triangles()
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return result
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def export_one(out_path, b_mesh, l_mesh, materials):
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"""Export a single tree variant to a clean GLB in a fresh temp scene."""
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scene = bpy.data.scenes.new("_TreeIngest")
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bpy.context.window.scene = scene
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col = bpy.data.collections.new("_Tree")
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scene.collection.children.link(col)
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b_obj = bpy.data.objects.new("Branch", b_mesh)
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l_obj = bpy.data.objects.new("Leaf", l_mesh)
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col.objects.link(b_obj)
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col.objects.link(l_obj)
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b_obj.data.materials.append(materials["branch"])
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l_obj.data.materials.append(materials["leaf"])
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l_obj.data.materials.append(materials["branch"])
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scene.view_layers[0].update()
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bpy.ops.export_scene.gltf(
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filepath=out_path,
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export_format="GLB",
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use_selection=False,
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export_apply=False,
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export_texcoords=True,
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export_normals=True,
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export_materials="EXPORT",
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export_image_format="JPEG",
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)
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bpy.data.scenes.remove(scene, do_unlink=True)
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def main():
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args = cli_args()
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out_dir = args["out"]
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os.makedirs(out_dir, exist_ok=True)
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if not os.path.exists(TREE_BLEND):
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print(f"Missing: {TREE_BLEND}")
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return 1
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bpy.ops.wm.open_mainfile(filepath=TREE_BLEND)
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branch_mat = bpy.data.materials.get("island_tree_01_branches")
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leaf_mat = bpy.data.materials.get("island_tree_01_leaves")
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if not branch_mat or not leaf_mat:
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print("Missing materials in source blend")
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return 1
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decimated = []
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for vi, (branch_id, leaf_id) in enumerate(PAIRS):
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branch_obj = bpy.data.objects.get(
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f"island_tree_01_branches_{branch_id}_LOD1")
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leaf_obj = bpy.data.objects.get(
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f"island_tree_01_leaves_{leaf_id}_LOD1")
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if not branch_obj or not leaf_obj:
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print(f"Skipping variant {vi}: missing LOD1 objects")
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continue
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b_mesh = decimate_to_target(branch_obj, TARGET_BRANCH_TRIS)
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l_mesh = decimate_to_target(leaf_obj, TARGET_LEAF_TRIS)
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decimated.extend([b_mesh, l_mesh])
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out_path = os.path.join(out_dir, f"tree_variant_{vi:02d}.glb")
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export_one(out_path, b_mesh, l_mesh,
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{"branch": branch_mat, "leaf": leaf_mat})
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kb = os.path.getsize(out_path) // 1024
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print(f" variant_{vi:02d}: branch={len(b_mesh.loop_triangles)}tris "
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f"leaf={len(l_mesh.loop_triangles)}tris ({kb}KB)")
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for mesh in decimated:
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if mesh and mesh.name in bpy.data.meshes:
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bpy.data.meshes.remove(mesh, do_unlink=True)
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print(f"\nDone — {len(PAIRS)} variants → {out_dir}")
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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