布料对象的当前法线。
这样,您可以读取布料对象的法线,以便分析其当前模拟状态。 注意,法线索引不一定与源网格的索引相对应 - 尤其是在源网格中使用三角形剥离 或 UV 接缝时(即,同一顶点的多个索引),布料顶点将不同,因为布料 模拟对每个顶点仅使用单个索引。
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