How to sample respective BSDFs after scene.ray_intersect(rays)?

[sunilhadap]

Hi all,

I am trying to programmatically render the scene (using cuda_ad_rgb variant). I populate bunch of rays. Followed by a call to scene.ray_intersect().

rays = my_sample_rays(scene=scene, sensor=sensor, sampler=sampler)
result = scene.ray_intersect(rays) # SurfaceInteraction

Once I get the ray interaction result, how can I sample the BSDFs respective to each ray using the SurfaceInteraction? This BSDF sampling will pretty fragmented, right? How can it be done efficiently in a vectorized form?

Thanks a bunch in advance, hopefully I am not missing something obvious.

Regards

Sunil

[sunilhadap]

BTW, ideally, I would like to implement a new type of sensor, instead of this ad-hoc sampling. Would there be, or would some have, an example of how to implement plugin sensor in python?

[sunilhadap]

Answering my own question about sensor plugin, found this spherical sensor example
https://github.com/rgl-epfl/differentiable-sdf-rendering/blob/main/figures/spherical_sensor.py

[njroussel]

Hi @sunilhadap

Have a look at how some of our own integrators are implemented. It is also described in the API reference: si.bsdf().

As for custom plugins, we have a tutorial on that, albeit for BSDFs: https://mitsuba.readthedocs.io/en/latest/src/others/custom_plugin.html
You simply need to implement the methods of the Sensor interface.