什么是体积射线投射中的射线相干性?
任何定义该术语的免费论文/教程将不胜感激(谷歌在免费部分没有提供太多帮助)。
Any free paper/tutorial defining this term would be appreciated (google hasn't been much help on the free part).
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在体积射线投射中,“射线相干性”是体积中的所有射线击中相同几何体的程度。
如果光线体积不相干,则该体积中的光线可能会击中不同的物体,这通常意味着您需要为此测试单独的光线。另一方面,如果您的体积是完全相干的,则只需对整个体积进行几何计算,并且该体积的各个光线计算可以完全矢量化。
一致性对于任何基于组的图形操作的性能都很重要。即使是现代 GPU 上的传统光栅化,也依赖于一致性来有效评估具有条件分支的像素着色器......
In volume ray casting, "ray coherence" is the degree to which all rays in a volume hit the same geometry.
If a volume of rays is not coherent, then rays in the volume may hit different objects, which usually means that you will need to test individual rays for this. On the other hand, if your volume is fully coherent, you only need to do geometry computations for the volume as a whole, and individual ray computations for that volume can be completely vectorized.
Coherence is important to the performance of any group-based graphics operation. Even conventional rasterization, on modern GPU's, relies on coherence to efficiently evaluate pixel shaders with conditional branches...