question

patrick trudeau avatar image
patrick trudeau asked ·

c4dtoA volume workflow issues

I am a new user who is really enjoying certain aspects of working with Arnold (getting some great results with Polymesh displacements!) However, I'm going a little bit crazy trying to figure out how to work with Arnold Volumes and .vdb files, which is what I really want to learn. I've followed many of the volume tutorials and get completely different results than what is indicated.

For example in this tutorial:

https://docs.arnoldrenderer.com/display/A5AFCUG/Volume+Sample+RGB+Example

The scene (R18) file uses the deprecated Volume Collector. If I replace it with the Standard Volume shader and follow instructions (they seem relatively straightforward) I get entirely different results than in the tutorial. Am I missing something or is valuable info missing from the tutorial?

In this tutorial things are much the same

https://docs.arnoldrenderer.com/display/A5AFCUG/OpenVDB+Workflow

and while I am 100% certain I have followed instructions to the letter, adjusting the Input Max, Bias, Gain, and Output Max values returns entirely different results that what is shown.

Furthermore, most tutorials I have found on the web still use the deprecated Volume Collector. How do I get similar results with the Standard Volume Shader?

I can see that it's possible to get great results with Arnold, and I'm willing to take the time to learn, but can someone please answer the questions above and point me to reliable and up to date sources of information?

Thanks in advance!

volumesvdb
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
Lee Griggs avatar image
Lee Griggs answered ·

>The scene (R18) file uses the deprecated Volume Collector.

It uses the Standard Volume shader. It works fine for me.

The Volume Collector would be from the Arnold 4 docs, but you have linked

to the Arnold 5 docs, so I have no idea what is going on.

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.