Dario Seyb comments

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                                            Dario Seyb

Differentiating through loops

Thanks for the reply! That clarifies things. I'll try to look at examples in the mitsuba3 repo to get some idea of what the "proper" way to do this is....

Directional Cross Derivatives

Update: I did some working out by hand and found that I can do this relatively cleanly (though a bit wastefully) using the hessian. $$ D^2_{v_x,v_y} k(x,y) = \sum_{j=1}^d (...

Half vector reprojection not performed in GDPT, leading to high variance in specular paths

Thanks for the comment and actually looking through the code! I have to admit that my GDPT implementation is *very* lacking. I basically only went far enough to understand the...