辅助贴图(或细节贴图)允许您在上面列出的主纹理上覆盖第二组纹理。您可以应用第二个反照率颜色贴图和第二个法线贴图。通常,与主要的反照率贴图和细节贴图相比,这些辅助贴图将映射到对象表面上重复多次且小得多的范围。
这样做的原因是允许材质在近距离观察时具有清晰的细节,同时在从更远处观察时具有正常的细节级别,而不必使用单个极高的纹理贴图来实现两个目标。
细节纹理的典型用途为: - 为角色的皮肤添加皮肤细节,如毛孔和毛发 - 在砖墙上添加微小的裂缝和地衣生长效果 - 为大型金属容器添加小划痕和磨损
如果使用单个法线贴图,请务必将其插入主通道。辅助法线贴图通道比主通道的成本更高,但具有完全相同的效果。
细节遮罩纹理允许您在模型的某些区域禁止应用细节纹理。这意味着可在某些区域显示细节纹理,而在其他区域隐藏细节纹理。在上面的皮肤毛孔示例中,您可能希望创建遮罩,使毛孔不会显示在嘴唇和眉毛上。
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