Bifrost Aero and Vray

[daniel9HCWR]

I can get my head around rendering bifrost aero with vray? My VFB is empty when i render? Does anybody know how to assign shader?

In the vray documentation its refered to a vray attribute but it does'nt appear in my attribute panel when i select my bifrost node in the outliner?

Anyone managed this that could help me?

/Daniel

[Christoph_Schaedl]

Vray cant render Bifrost Aero. You need to export a VDB.

[daniel9HCWR]

Noob question maybe, but what is a VDB?

[morten.bojsen-hansen]

OpenVDB is a file format for sparse volumes. You can export them from Bifrost using the write_OpenVDB node.

[daniel9HCWR]

How does the write node work? It doesnt seam to write anything?

[sepu6]

Watch this 

https://youtu.be/tVkaKXJx91k?si=2b8f47nYhvYZ91AN&t=1708

or this 

https://youtu.be/cd3HgvM8sXg?si=PMGXaNkRYm4y2z6R&t=1651

[morten.bojsen-hansen]

@daniel9HCWR at least on the of the outputs (on the right hand side of the node) of the write_OpenVDB node has to be connected to either an output node or a terminal for the write_openVDB node to execute.

[daniel9HCWR]

Okay, i thought the writing was an alternative output.

The linked youtube-clip showed a method using file-cache node between simulation-node and output. 

What is the difference between these to methods?

[morten.bojsen-hansen]

The file_cache node just wraps up several of the write_XYZ nodes into one node. You can check this yourself by diving into the node. Personally, I prefer to use write_OpenVDB directly since it give the most control.

[damaggio]

Just cache your VDB file and upload in a Vray volume grid for rendering.