Houdini - Trying to get 2 wheels to rotate with one transform at the same time

[vertigo262]

 Trying to get 2 wheels to rotate with one transform at the same time. I am using a copy  Stamp, and it partially works except one wheel is reversed, and I can't figure out how to get the other one rotated the same way so it works.

I am thinking instead of a copy stamp, linking 2 objects might make more sense with a center transform, but I don't know how to do this.

If anyone has any insight how to do this it would be greatly appreciated

 

[PixelNinja]

I looks like the copy sop is set to rotate the copy by 180 degrees on the y axis. This would make the copied wheel rotate in the wrong direction.

Here are three approaches:

1- Transform sop to control the wheel rotation, then mirror sop to create the other wheel.

2- Transform sop to control the wheel rotation then copy sop set to scale -1 in the X axis to create a the other wheel

3- Copy the wheel so that you have two packed copies and then use a mops transform modifier to rotate the packed primitives.

 

I used method 3 for a simple sops based car rig recently and it worked really well. I had a single mops transform handling auto rotation (based on travel distance) for all 4 wheels.

 

[vertigo262]

Thank you Matt!

That solved my issue, and works really well! Not doing a full rig just some simple car posing on multiple frames!