Declaration

TProgressiveRasterizer = class(TRasterizer)

Description

TProgressiveRasterizer implements multi-pass progressive subsampling. It begins by evaluating coarse pixel blocks of size $2^{\text{Steps}}\times 2^{\text{Steps}}$, filling destination blocks with initial samples. In subsequent passes, it successively halves the step size until individual 1-pixel resolution is reached.

This approach provides fast initial visual feedback during time-consuming sampling or raytracing operations, rapidly presenting a full coarse preview before refining fine details.