Fixed size buffers per thread

[ishaanshah]

Hi,

Is it possible to create a fixed-size buffer for each thread in the rendering loop? Something like mi.VectorXf, where the X is defined during JIT compilation based upon some variable.
I am trying to implement Efficient Rendering of Layered Materials using an Atomic Decomposition with Statistical Operators [Belcour, 2018] in Mitsuba 3. The paper computes a set of N energies and variances for N layers depending on the shading point and viewing angle. Hence I need a way of storing these N floats per thread for further evaluation and sampling. Currently, I can render at max four layers as the floats can be stored in a Vector4f. However, it would be good to have an implementation that works for an arbitrary number of layers.

Thanks

[rtabbara]

Hi @ishaanshah ,

Just taking a look at the accompanying (old) Mitsuba code from the paper, I think you'd similarly want to store your parameters as an N-sized vector/list of mi.Float variables