[Sidefx-houdini-list] Transform axis

Jerry Corda-Stanley jerry at intelligentcreatures.com
Tue Feb 27 17:17:25 EST 2007

if you want a manual solution you can use a transform SOP, disconnect
the transform handle using
then ctrl right click (I think) start orientation picking, select 3
points and your handle will snap to your

with the transform axis SOP. think of the direction as a normal, or the
direction from point0 to point1
on your edge. you can get that from a simple point expression in the
direction fields.

hope that helps some.

> I'm trying to figure out a way to select
> any edge on a poly model and then
> be able to rotate the object around
> that edge (like an axis)
> So far, as an example, I've tried to
> 1. drop down a default poly sphere
> 2. branch a transformaxis SOP off to one side.
> 3. go back to the poly and select any edge
> 4. then dissolve away all edges but that one.
> I can then source the centroid of that edge,
> in the origin fields of the transformaxis SOP,
> and that part works. I can rotate around that
> point.
> However, direction is the problem. I can't figure
> out what to put in the direction fields (of the
> transformaxis SOP) so the object can be rotated
> around that edge exactly like an axis.
> I hope I'm not missing something really simple.
> Thanks for any thoughts.
> Larry

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