Screen Area Ray Casting

Works also for real-time lighting by plane-ray casting. Intended to narrow down the plane-rays to be cast per object from the camera origin point. For really high pre-baked scenes, 4K,8K,16K vertical plane rays per rendered scene camera origin. OpenGL/Vulkan vertex/pixel shader with ray caster accurate rendering on z-buffer. Works for recursive image view raster casting. also for grid based world partitioning sphere boundary volume ray culling.