Hybrid renderer

Upon finalizing a rasterizer that matches the ray-tracer, a hybrid mode may be added. The result of the primary rays will be a product of the rasterizer, while any subsequent bounces will be from the ray-tracer. This would require the rasterizer to generate a buffer of positions + normals + materials at each pixel, from which subsequent rays may be generated. A restriction in that case will be the sampling of the primary rays - in each frame the samples for those should be slightly jittered if possible. There is also a concern regarding AA, where a higher resolution image should be fed to the raytracer if actual AA is desired.

没有指定文件或测试。首先检查现有的 rasterizer 和 ray-tracer 实现，然后弄清楚主射线位置、法线、材质、抖动采样和 antialiasing 将如何在两者之间传递。完成的标准是形成一套达成共识的设计，并实现一个可运行的混合渲染器。

由索引模型根据 Issue 内容生成。