Radeon ProRender

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);