Herbie Gillman
Lemon_half_moon
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Compute velocity attribute from volume sequence that was created outside Houdini? April 24, 2019, 2:38 p.m.
Thanks for the advice. I did give optical flow a go but without any luck. I'll persevere and give it another go.
Compute velocity attribute from volume sequence that was created outside Houdini? April 18, 2019, 2:38 p.m.
Hi there,
I am trying to produce a velocity attribute from a volume sequence that was produced in CFD software and converted to .vdb (not converted by me) in order to render with motion blur.
I've tried a few things, including convertvdb to polygons and then using the trail node to compute velocity based on the geometry. However this doesn't work because the volume is re-meshed every frame and the polygons end up in totally different positions each frame. resulting in this mess when I visualise the ‘v’ attribute.
I just wondered if any one knows if it is possible to produce a velocity attribute when the volume itself doesn't carry anything other than its voxel values?
I'd be very grateful if you could help, thanks.
I am trying to produce a velocity attribute from a volume sequence that was produced in CFD software and converted to .vdb (not converted by me) in order to render with motion blur.
I've tried a few things, including convertvdb to polygons and then using the trail node to compute velocity based on the geometry. However this doesn't work because the volume is re-meshed every frame and the polygons end up in totally different positions each frame. resulting in this mess when I visualise the ‘v’ attribute.
I just wondered if any one knows if it is possible to produce a velocity attribute when the volume itself doesn't carry anything other than its voxel values?
I'd be very grateful if you could help, thanks.