[Sidefx-houdini-list] transferring data from points to volumes

Peter Bowmar pbowmar at gmail.com
Sat Apr 4 00:53:18 EDT 2009


I haven't tried this, but a pciterate() should work, basically each
volume sample would find the nearest point(s). This would need
VOPs/VEX of course but would be much faster than an expression. I
don't think you'd need a Volume VOP, but again I haven't actually
tried this.

Cheers,

Peter B

2009/4/3 Steve Gustafson <sgustafso at gmail.com>:
> Hey everyone. I'm trying to figure out how to transfer attributes from
> points to volumes. Something like the volume_sample VOP, only the reverse of
> the process: a smooth, weighted lookup of the value of an attribute for the
> particles found within each voxel. Anyone know of any good tricks to do
> this?
>
> The only approach I'm seeing atm is to use an expression inside of a
> volumemix sop. You could pregenerate a 3d grid of points, each point
> centered within the respective voxel, so that this would be a reasonably
> cheap process (the smoothing of data would be optimized through normal sop
> procedures. I.e., a weighted attribute). But it still requires an expression
> to be executed against each voxel, which obviously doesn't make for the best
> approach. Ideally, there'd be a way of access the data from within a volume
> vop.
>
> Thanks
>
> ps - I'm currently in H9.5
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