question

Goubard Thomas avatar image
Goubard Thomas asked ·

problem glass material with thickness strange reflections

hello, i've found a strange problem.

Here is my render :

you can see that there is 3 reflections of the hdri (it does the same with simple area light), that's logical because there is 3 surfaces with specular (the two surfaces of the bottle and the liquid), but what i don't understand is why there is this big offset with the three reflections, normally they're very close because the thickness is little.


so i've tested with simple sphere in 3dsmax (2019 and 2020) and maya 2019.2, i think is a bug of the rendering for 2 transparents surfaces . So there is two sphere, on the left simple sphere without thickness, on the right there is one but with a very litlle thickness. And you can see that the reflections have a big offset, it's not realistic, and even when i set the thickness at 0, there is a big offset like the thickness were very big.Thanks if someone know the solution.

glass
capture1.png (426.5 KiB)
2.png (348.6 KiB)
layer-2.png (127.9 KiB)
10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

1 Answer

· Write an Answer
Thiago Ize avatar image
Thiago Ize answered ·

Unfortunately this is a known limitation in Arnold due to our caustics avoidance code.

Share
10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Write an Answer

Hint: Notify or tag a user in this post by typing @username.

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Welcome to the Arnold Answers community.

This is the place for Arnold renderer users everywhere to ask and answer rendering questions, and share knowledge about using Arnold, Arnold plugins, workflows and developing tools with Arnold.

If you are a new user to Arnold Answers, please first check out our FAQ and User Guide for more information.

When posting questions, please be sure to select the appropriate Space for your Arnold plugin and include the plugin version you are using.

Please include images, scene and log files whenever possible as this helps the community answer your questions.

Instructions for generating full verbosity log files are available for MtoA, MaxtoA, C4DtoA, HtoA, KtoA, and Kick.

If you are looking for Arnold Documentation and Support please visit the Arnold Support site.

To try Arnold please visit the Arnold Trial page.

Bottom No panel present for this section.