lflores Posted September 13, 2013 Share Posted September 13, 2013 Don't know if this is more of a VDB issue rather a Houdini issue. One thinks you should be able to create a relatively low resolution VDB for a large model, then combine it with VDB grids for areas of high detail. Good example, patching in a flip sims into a large body of water. You could have a relatively low rez SDF grid for the main body of water, then generate high rez SDFs for each of your flip simulations, do a VDB combine using 'min', and they all combine nicely. As far as I can tell, the output is set to a single voxel size, multiresolution is not an option. I know that VDB scales so well, this should be a non-issue for most cases. But I'm definitely hitting RAM walls with the resolution detail requirements. Multires grids are a perfect solution to this problem. Quote Link to comment Share on other sites More sharing options...
lflores Posted September 13, 2013 Author Share Posted September 13, 2013 And while we're at it, is there any VDB VOP capability? Quote Link to comment Share on other sites More sharing options...
edward Posted September 13, 2013 Share Posted September 13, 2013 You're correct, VDB grids (as a data structure) are not multiresolution. If you want multires grids, I think you would need some sort of "meta" structure on top of multiple VDB grid primitives and manage that somehow. VDB VOP == Volume VOP. Quote Link to comment Share on other sites More sharing options...
lflores Posted September 13, 2013 Author Share Posted September 13, 2013 That's interesting. I'll bet it would be possible to emulate some kind of multires funtionality by having a VDB VOP delegate SDF lookups to multiple VDB grids, based on point position. Quote Link to comment Share on other sites More sharing options...
lflores Posted September 13, 2013 Author Share Posted September 13, 2013 I'm using Houdini 12.5.427, no VDB VOP. What version has this? Quote Link to comment Share on other sites More sharing options...
Skybar Posted September 13, 2013 Share Posted September 13, 2013 I'm using Houdini 12.5.427, no VDB VOP. What version has this? You misunderstood, there is none. Use the Volume VOP. Quote Link to comment Share on other sites More sharing options...
edward Posted September 13, 2013 Share Posted September 13, 2013 The Volume VOP also operates on VDB primitives Quote Link to comment Share on other sites More sharing options...
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