Hello,

I'm currently implementing a PBR-based BRDF in my engine, and I'm having slight trouble/concerns about the correctness of my results. So I'd like to ask if someone knows of an application that can be used to check those kind of things - specifically, I'd like to see ie. how GGX/Microfacet-Distribution/... is supposed to look to check if I'm feeding it the right input values, so some kind of open-source code project where I can play around with the shaders would be exactly what I'm looking for. Is there any such thing? Thanks!

Maybe these:

https://github.com/derkreature/IBLBaker

https://github.com/dariomanesku/cmftStudio

Mitsuba is popular for using as a reference. MJP did a quick start article here.

Thanks all for the suggestions!

I already knew Mitsuba and was planning on using it to evaluate my results. I didn't think it was useful for what I need right now, since right now I'm probably looking for some mistake in my shader code/data, so I was looking for something simpler; the two github-links look like they might work.

You could use a raytracer(V-Ray 30 days trial https://www.chaosgroup.com/download-free-trials for example) to create a few reference images and then and use imagemagik to compare the images.