Maybe you're thinking of differentiable rendering? https://blog.qarnot.com/an-overview-of-differentiable-rendering/ https://blog.qarnot.com/an-overview-of-diff

Maybe you're thinking of differentiable rendering? https://blog.qarnot.com/an-overview-of-differentiable-rendering/ https://blog.qarnot.com/an-overview-of-differentiable-render...