Scene
Depth-only program for camera-perspective offscreen prepasses (e.g. the Gaussian-splat pass's terrain occlusion depth). Unlike DirectionalDepthProgram there is no caster pancaking: under a perspective projection, geometry in front of the near plane must clip exactly as the main color pass clips it — pancaking it onto the near plane would write bogus near depth into the prepass target and wrongly occlude everything behind it.