simpel feathersystem

[Ezz]

Hi all Houdini-Folks

I have recently been working on a very simpel feathersystem. Its basicly an offset off points in the geometry along the normal.

Piping the offsat points through CHOP´s gives a weighted feeling when using a lagnode. Together with the originally points on the geometry,

and the offsat weighted points, I can make a new set of normals.

With a copySOP I can make the copied object act featherlike.

My problem is that the rotation of the copied object acts funny when animated.

Is there a way to make some kind of upvector for my feathers and what causes this odd rotation??

Any help or hint is much appriciated.

Erik

simple_feather.hipnc

Edited February 2, 2010 by Ezz

[SpencerL]

Hi all Houdini-Folks

I have recently been working on a very simpel feathersystem. Its basicly an offset off points in the geometry along the normal.

Piping the offsat points through CHOP´s gives a weighted feeling when using a lagnode. Together with the originally points on the geometry,

and the offsat weighted points, I can make a new set of normals.

With a copySOP I can make the copied object act featherlike.

My problem is that the rotation of the copied object acts funny when animated.

Is there a way to make some kind of upvector for my feathers and what causes this odd rotation??

Any help or hint is much appriciated.

Erik

The copy SOP can accept 3 attributes, N, up, and pscale to determine the direction, orientation, and size of each copy. Before your copy sop, add a point sop. Under the particle tab > Add Up Vector and set it to the direction you need. I havent looked at your file, but I would assume it would need to be perpendicular to your N direction, if your N is flowing along the surface of the geo.

[Ezz]

Hi Spencer.

Thanks a lot for your responce. Just what I was looking for.

Cheers

Erik