I am still confused why the light field is 4D? Is that because we need one additional dimension to capture the direction of light?
doberdog91
I think it starts as 5D, covering all rays in 3D space, but pointing in all directions (2D for directions). Then it can be reduced to 4D because radiance is constant along rays.
I am still confused why the light field is 4D? Is that because we need one additional dimension to capture the direction of light?
I think it starts as 5D, covering all rays in 3D space, but pointing in all directions (2D for directions). Then it can be reduced to 4D because radiance is constant along rays.
why radiance is constant alogn rays?