is dielectric material issue?

[tigrazone]

I try to render scenes\cornell_box\cornell_box_dir.json

when I change glass sphere material to "type": "dielectric" I have different image

i.e. roughness = 0.0

why images are different?

[tigrazone]

I try to change https://github.com/yuphin/Lumen/blob/e08a96350a416de707c5a425ef40a1639e8769f3/scenes/torus/torus.xml#L19 to dielectric and VCM give me this picture

with SPPM I have this

[yuphin]

Yes, I think something in VCM broke while I was adding new materials. I'll look into it after I restructure the project a bit and finish up the remaining issues with ReSTIR PT.

[tigrazone]

I mean maybe dielectric material is not always works correct. second screenshot - SPPM, not VCM