Suggestion: VDB import / export support #319
Description
Hi, firstly thank you for making this project public and putting so much time into optimizing it.
I'm interested in testing it for film and VFX applications (non-commercial) to see how it compares to existing fluid solvers.
For film and VFX, VDB files are commonly used. Despite their size, they're common for rendering in software like Houdini and Blender. There's also been recent work on compression such as ZibraVDB.
Currently this software only supports .vtk volumes. This is useful for scientific applications, but not ideal for film. I thought it would be nice to add VDB import/export as an optional #define, if the user has OpenVDB headers installed.
For importing, VDB could be used for collision objects stored as level set (SDF) volumes.
For exporting, it could be useful for smoke and fluids so they could be rendered in other software.
When I have time I'll look into implementing this myself, but want to see what you think too.