Adaptive Sampling

Adaptive sampling is a feature which allows you to reduce computing time on framebuffer’s areas that converge faster.

Usage

1. Attach a Variance AOV to this Context:

   rpr_framebuffer framebufferVariance = nullptr;
   rprContextCreateFrameBuffer(context_, fmt, &desc, &framebufferVariance);
   rprContextSetAOV(context_, RPR_AOV_VARIANCE, framebufferVariance);
   

2. Set the following parameters:

   // Size of the sampling area in pixels – recommended: [4, 16]
   rprContextSetParameterByKey1u(context_,RPR_CONTEXT_ADAPTIVE_SAMPLING_TILE_SIZE,16);
   
   // Minimum number of samples per pixel before activating Adaptive sampling
   // Recommended to set 10 or more
   rprContextSetParameterByKey1u(context_,RPR_CONTEXT_ADAPTIVE_SAMPLING_MIN_SPP,10);
   
   // Tolerance of the Adaptive Sampler
   // Between 0 and 1
   // Lower value means better quality final image
   rprContextSetParameterByKey1f(context_,RPR_CONTEXT_ADAPTIVE_SAMPLING_THRESHOLD,0.1f);