Whisky glass and Ray epsilon

[atoyuser1]

Trying to produce a simple glass of whisky. I've used a couple of C4D library assets with a whisky material from LiveDB and Specular for the glass with 1.52 index. Surprised how different and how incorrect they look.

Another thing that confused me was the vast difference when adjusting the Ray epsilon. (attached 0.00001 to 0.01) The glasses are to scale.

I found this thread which experiments with the liquid overlapping the glass, but I don't think that is the problem

I'm using Pathtracing. Is there somewhere I'm going wrong?

ray epsilon 0.00001

ray epsilon 0.0001

ray epsilon 0.001

ray epsilon 0.01

[atoyuser1]

Hi,

It's strongly advised to avoid changing the Ray Epsilon, especially if the scene is already at-scale aka properly scaled (should always be).
This is a nested dielectric case, not Ray Epsilon.

I found this thread which experiments with the liquid overlapping the glass, but I don't think that is the problem

This thread is from 2013 and no longer relevant since the introduction of priorities for meshes featuring transmission through multiple mediums embedded inside of each other (nested dielectrics).

Thanks, I have been looking at Nested Dielectrics. However I think it may not be available in Octane PR14 yet...

[bepeg4d]

Hi atoyuser1,
yes correct, Nested Dielectric option is not available in OctaneX PR14.
Nested Dielectric has been introduced with 2020.2 SDK, while OctaneX PR14 is based on 2020.1.5 SDK.

About the scene, the issue is caused by the Normal direction, in one case it is the Glass, and in the other is the Liquid that needs to flip the normals:

Liquid in glass-v02_b.c4d.zip

(93.09 KiB) Downloaded 78 times

ciao,
Beppe

[atoyuser1]

Thanks Beppe. I realised it matters which side the spline is on in the Lathe object, that dictates where it's normals are, I don't use Lathe much

Thanks again