Progressive Lightcuts for GPU. Tom áš Davidovič I. Georgiev , P. Slusallek Saarland University, Intel VCI. Direct illumination. Direct illumination. VPL Rendering. VPL Rendering. VPL Rendering. Bruteforce : 11s. VPL Rendering. Lightcuts : 2s. VPL Rendering. VPL Rendering.
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I. Georgiev, P. Slusallek
Saarland University, Intel VCI
Contribution ≈ k / d^2
P( ray.length ) ≈ ray.length^2
Variance ≈ sqrt( b)
Bias ≈ 1 / sqrt( b)
MSE = Variance + Bias^2 = sqrt( b) + 1 / b
b= base * iteration ^ 0.66
GPU Lightcuts work
Progressive – averaging images
Can relax clamping – #VPLs ^ 0.66
Look into Multidimensional Lightcuts