- [❔ other question] Add differentiable parameter to shape #595

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1. Speierers commented on May 10, 2022

   

   Speierers

   on May 10, 2022

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   Hi @chx125ck ,

   In the current codebase this will require a few changes in sphere.cpp. First you will need to set the type of m_radius to Float. Then make sure it is properly exposed and handled in the traverse() and parameters_changed() method. You will probably need to change the update() method as well so that it doesn't overwrite m_radius.

   More importantly, you will need to use the path-reparam integrator in order to correctly account for the discontinuities in the light transport equation when differentiating w.r.t. such parameter. Please see the pathreparam-optix7 branch for this.