Hello magicians. Here I have a scene with a glass object and inside my animation. The problem is the following, no matter how thick the glass is with karma I always have a big deformation. Whereas with mantra not. And so it's annoying for my rendering.
How do I do so that under karma the glass reacts the same way as under mantra ?
is more a problem with how karma see the glass like an object full of glass
to a problem on ior
if you want i can put the scène on my server

Thanks for your help

if your glass has true thickness this should work fine as long as the thickness is thicker than Ray Bias

alternatively you can use single sided geo and use PBR Glass shader, just check
- Thin Film refractions: on
- Shade Both Sides as Front: on
(in case you are using XPU, Standard Surface MtlX also has Thin Walled checkbox and it seems to be working fine in XPU, but in CPU mode it seems to be broken)

bgood
if you want i can put the scène on my server

no need to share your production scene, just make a simple example if its still not working

Thanks for your help, i have a thickness on my mesh thats work on mantra not in karma.

Tomorrow i try the pbr glass shader
thin film refraction on is on karma settings no ?

bgood
i have a thickness on my mesh thats work on mantra not in karma.

as I said may depend on your ray bias

bgood
thin film refraction on is on karma settings no ?

no, it's a shader setting

maybe you can use Classic Shader, which has Thin Film Refraction as a single checkbok and also wraps Fake Caustics inside so you wouldnt have to do it yourself, essentially it uses PBR Glass inside
(Principled Does too, they just didnt promote that setting)

its ok now thanks