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Light in GroIMP
This section present how the light is modeled in GroIMP. Covering both ray tracing and rendering.
GPUFlux
GroIMP provides a GPU-based ray tracer based on a Monte-Carlo method. It utilizes available computing resources through OpenCL. During simulation, each object keeps track of the amount of light it absorbs. Per object, it either computes a fully discretized absorption spectrum or several integrated weighted spectra, which are subsequently used in a photosynthesis model.
GPUFlux implements on GPU three well known, physically based rendering algorithms: Path Tracing (PT), BiDirectional Path Tracing (BDPT) and Energy Redistribution Path Tracing (ERPT).
External renderer
External renders can be used to create a 3D view of higher quality. The POV-Ray Plugin provides a scene export to the POV-Ray format which makes it possible to use the free ray-tracer POV-Ray as an external renderer, see the POV-Ray manual. The resulting image is directly shown in GroIMP's 3D view.