questions on the backward cuda code

sunset1995 / DirectVoxGO

Direct voxel grid optimization for fast radiance field reconstruction.

https://sunset1995.github.io/dvgo

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questions on the backward cuda code #67

Open Zhentao-Liu opened 10 months ago

Zhentao-Liu commented 10 months ago

I have a question on your backward cuda code. I could derive the first equation // grad[i] = grad_weights[i] T[i] - back_cum / (1-alpha[i] + 1e-10) but I really dont know how to get second equation // back_cum += grad_weights[i] weight[i]
what does it meanning for? many thanks! cuda1 cuda2