RayTracingBasic

Process

basic : camera ray -> obj in scene(combined normals and lightbuffers, then shade)

x = (\frac{2, (i + 0.5)}{w} - 1) \cdot a s p e c t R a t i o \cdot s c a l e, y = (1 - \frac{2, (j + 0.5)}{h}) \cdot s c a l e

再使用loot-at逆矩阵变换到世界空间

Direct Light contribution:

场景是纯漫反射（无高光），BSDF 即是 Lambertian：

f_{r} = \frac{ρ}{π}

方向光直接光照：

L_{o} = \underset{EvalDiffuse}{\underset{⏟}{\frac{ρ}{π}}} \times \underset{EvalDirectionalLight}{\underset{⏟}{L_{l i g h t} \cdot V}} \times \underset{main 中}{\underset{⏟}{max (N \cdot L, 0)}}

Indirect Light