Is there a way to get all values generated for a pixel by the samples per pixel argument?

[harshana95]

My understanding is that multiple samples are generated for each pixel (by spp argument) and aggregated at the end. I want to store all these values in an array without reducing them to the final value. Can you please tell me the way to do it?

I tried to create a custom Film, but the issue in #166 (comment) arises.

[njroussel]

There was a missing constructor in the trampoline bindings for Film plugins. It will be fixed in the next release, it's on master now: 69f39ce. This should fix the missing constructor error you were seeing.

Your understanding is correct, samples are accumulated/aggregated. The box filter will guarantee that your samples are not weighted across multiple (neighboring) pixels.
The proper implementation of what you're trying to achieve would indeed be a Film. This would also maybe require a derived ImageBlock class since that is where the accumulation actually happens. But this would require a lot of changes in the C++ part of the code.

A easier implementation would be to ignore the existing mi.render and integrator.render pipelines, but rather to directly use integrator.sample(). You can take a look at this tutorial: https://mitsuba.readthedocs.io/en/latest/src/rendering/scripting_renderer.html
This should give you an idea of how to spawn the initial rays and then you can load whichever Integrator you desire and use its sample() method instead of writing out the rendering loop manually as it is done in the tutorial.

[harshana95]

Thank you. I will try to do that. BTW if i do multiple renders with spp=1 and different seed values, can I achieve the same result?

[njroussel]

Yes, absolutely.
The only difference will be in performance, I expect it to be slower.

[harshana95]

Thank you very much!