The options of the GPUFlux model can be modified in the ''Preference'' panel within GroIMP see Figure 1.

{{:user-guide:gpuflux_options.png}}

**Figure 1: preference panel**

===== Flux renderer =====

==== General ====

  * **Spectral resolution in nm**: By default 1.
  * **Tessellation flatness**
  * **Sky resolution**
  * **Channel resolution**

==== Renderer ====

  * **Tracer**
  * **Full spectral rendering**
  * **Spectral dispersion**
  * **Maximum depth**
  * **Minimum sample power**
  * **Random seed**

===== OpenCL =====
==== Advanced ====
  * **Precompile kernels**
  * **Performance**
  * **Prefered iteration time in ms**
  * **Minimum sample batch size**
  * **Minimum detectors**
  * **Ray offset**
  * **Use GPU Devices**
  * **Use Multiple Devices**

See more: 
  * [[:groimp-platform:gpuflux|GPU Raytracing in GroIMP]]