Missing velocity attribute for one axis

[blur959]

Hi all, Anyone knows why is my velocity data only for 2 axis? I am using a metaball to copy onto a circle. I then use it to deform a grid by a magnet sop. Any help and suggestion given is much appreciated.

Many thanks.

velocity_check.hip

[bhaveshpandey]

hi, a metaball is not really a usual geometry its just field data (http://www.sidefx.com/docs/houdini9.5/nodes/sop/metaball)

if you inspect your metaball in a wireframe view and enable point numbers and display you can see that it has just one point.

your Y vel is coming 0 because all your metaballs are on the same Y position (ie 0) and your calculating velocity with $TY-$TY2.

I'm not really sure why you need velocity data on metaballs for deforming a grid? anyways you could just append a trail sop after your copy sop and compute velocity from there.

hope this helps.

Edited June 29, 2011 by bhaveshpandey

[blur959]

hi, a metaball is not really a usual geometry its just field data (http://www.sidefx.com/docs/houdini9.5/nodes/sop/metaball)

if you inspect your metaball in a wireframe view and enable point numbers and display you can see that it has just one point.

your Y vel is coming 0 because all your metaballs are on the same Y position (ie 0) and your calculating velocity with $TY-$TY2.

I'm not really sure why you need velocity data on metaballs for deforming a grid? anyways you could just append a trail sop after your copy sop and compute velocity from there.

hope this helps.

Yes it does, thanks!