必须照射到正面才会被视为可用的射线原点发射光线的百分比。
在预计算过程中,系统会计算从射线原点到集群的可见性,但也会试图拒绝位于几何体内的射线原点。如果照射到正面的光线的百分比低于 backFaceTolerance,则系统会将该射线原点标记为无效,但这不会影响光能传递计算。
例如,如果 backFaceTolerance 为 0.0,则仅在射线原点只能看到背面的情况下才会拒绝该射线原点。如果为 1.0,即使射线原点有一条射线照射到背面,系统也会拒绝该原点。\ \
此设置有助于控制光照泄漏,但应考虑在网格制作工作流程的上下文中使用此设置。通过将值设置为 0.0 来防止射线原点遭拒,这将确保 Enlighten 不会因单面几何体而拒绝射线原点。但是,如果大多数网格已闭合,那么可见背面就极为罕见,设置正值可减少光照泄漏或防止变暗,否则相交几何体也会导致这种情况发生。
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