127 lines
4.9 KiB
Python
Executable File
127 lines
4.9 KiB
Python
Executable File
import bpy, sys, time, math
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def clear_default_objects():
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for name in ["Cube", "Light", "Camera"]:
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if obj := bpy.data.objects.get(name):
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bpy.data.objects.remove(obj)
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def mark_sharp_edges(obj, angle=30):
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bpy.context.view_layer.objects.active = obj
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bpy.ops.object.mode_set(mode='EDIT')
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bpy.ops.mesh.select_all(action='SELECT')
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# 标记30°以上的边为锐边
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bpy.ops.mesh.edges_select_sharp(sharpness=math.radians(angle))
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bpy.ops.mesh.mark_sharp()
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bpy.ops.object.mode_set(mode='OBJECT')
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def planar_decimate(obj, angle_limit=35.0, ratio=0.5, protect_uv=True):
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"""使用Decimate修改器+智能参数配置"""
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print(f"启动高级减面流程 | 模式: 平面优化+权重控制")
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#"""
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# 添加Decimate修改器（平面模式）
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mod = obj.modifiers.new(name="PlanarDecimate", type='DECIMATE')
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mod.decimate_type = 'DISSOLVE' # 平面溶解模式
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mod.angle_limit = math.radians(angle_limit) # 角度转弧度
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mod.use_dissolve_boundaries = False # 溶解边界防止破面[5](@ref)
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#"""
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"""
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mod = obj.modifiers.new(name="CollapseDecimate", type='DECIMATE')
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mod.decimate_type = 'COLLAPSE'
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mod.ratio = 0.1 # 保留30%面数
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mod.use_symmetry = True
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mod.vertex_group = "high_detail" # 绑定顶点组保护细节区域
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#"""
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# 保护关键属性
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mod.delimit = {'NORMAL', 'UV'} if protect_uv else {'NORMAL'} # UV保护[1](@ref)
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mod.use_symmetry = True # 对称保护[1](@ref)
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# 保护边界：创建顶点组标记轮廓边
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if "boundary_edges" not in obj.vertex_groups:
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obj.vertex_groups.new(name="boundary_edges")
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mod.vertex_group = "boundary_edges"
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mod.invert_vertex_group = True # 仅减非边界区域
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# 应用修改器
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bpy.context.view_layer.objects.active = obj
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bpy.ops.object.modifier_apply(modifier=mod.name)
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print(f"平面优化完成 | 容差角: {angle_limit}°")
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def collapse_decimate(obj, ratio=0.3, protect_groups=True):
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"""核心减面：Collapse模式+细节保护"""
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mod = obj.modifiers.new(name="CollapseDecimate", type='DECIMATE')
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mod.decimate_type = 'COLLAPSE'
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mod.ratio = ratio
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# 顶点组保护（需提前在Blender中标记高细节区域）[1](@ref)
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if protect_groups and "high_detail" in obj.vertex_groups:
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mod.vertex_group = "high_detail"
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mod.invert_vertex_group = True # 仅减非保护区域
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print("启用顶点组保护 | 保留高细节区域")
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# 关键保护设置
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mod.use_symmetry = True
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bpy.ops.object.modifier_apply(modifier=mod.name)
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print(f"塌陷减面完成 | 保留比例: {ratio*100}%")
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def triangulate_mesh(obj, quad_method='BEAUTY', ngon_method='BEAUTY'):
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"""将模型三角化[1,2](@ref)"""
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print("启动三角化处理...")
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# 添加三角化修改器
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mod = obj.modifiers.new(name="Triangulate", type='TRIANGULATE')
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mod.quad_method = quad_method # 四边形处理方法
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mod.ngon_method = ngon_method # 多边形处理方法
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mod.min_vertices = 4 # 对四边形及以上面进行三角化
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# 应用修改器
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bpy.context.view_layer.objects.active = obj
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bpy.ops.object.modifier_apply(modifier=mod.name)
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# 验证三角化结果
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tris = sum(1 for poly in obj.data.polygons if len(poly.vertices) == 3)
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total_faces = len(obj.data.polygons)
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print(f"三角化完成 | 三角面比例: {tris/total_faces*100:.1f}% ({tris}/{total_faces})")
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def optimize_geometry(obj):
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"""后处理：清理拓扑+法线修复[1,6](@ref)"""
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bpy.context.view_layer.objects.active = obj
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bpy.ops.object.mode_set(mode='EDIT')
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bpy.ops.mesh.remove_doubles(threshold=0.001) # 合并重复顶点
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bpy.ops.mesh.normals_make_consistent() # 统一法线
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bpy.ops.object.mode_set(mode='OBJECT')
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print("拓扑清理完成 | 法线已重计算")
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if __name__ == "__main__":
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argv = sys.argv[sys.argv.index("--") + 1:]
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input_path = argv[0]
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angle_limit = float(argv[1]) if len(argv) > 1 else 5.0
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output_path = argv[2] if len(argv) > 2 else input_path.replace(".ply", "_decimated.ply")
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# 硬件加速配置
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# bpy.context.scene.cycles.device = 'GPU'
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# bpy.context.preferences.system.memory_cache_limit = 4096
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clear_default_objects()
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# 导入PLY模型
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bpy.ops.wm.ply_import(filepath=input_path)
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obj = bpy.context.selected_objects[0]
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print(f"开始减面操作：{obj.name}")
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# 执行减面
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mark_sharp_edges(obj)
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planar_decimate(obj, angle_limit) # 先平面优化
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collapse_decimate(obj, ratio=0.2) # 再智能塌陷 // 0.1-3效果好，0.2-3综合不错
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optimize_geometry(obj) # 最终清理
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triangulate_mesh(obj)
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print("减面完成")
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bpy.ops.wm.ply_export(
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filepath=output_path,
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apply_modifiers=False
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)
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print(f"模型已导出至：{output_path}")
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