Vector transform problem

[Lewul]

Hey,

 

Is there a way to create an attribute vector which can follow transformations like rotations, like the N vector. For exemple : I want my vector attribute to be (0, 1, 0) at the first frame, and next frame if my object is rotating I want my attribute to inherit that rotation (so my vector attribute is not equal to (0, 1, 0) anymore). Maybe there is a simple solution to this problem, but I'm unable to find it...

 

Thanks,

 

Tom

[anim]

either set Qualifier to vector or normal through Attribute Create SOP (right next to type, defaults to Guess From Name)

or use setattribtypeinfo() VEX function to do that in wrangle 

or or Add Attribute VOP

 

http://forums.odforce.net/topic/23891-how-to-get-dops-to-transform-your-input-point-vectors/?p=140366

[Lewul]

Thanks for your help Tomas,

 

But do I have to assign it as a "rest" attribute (freezing frame 1, creating the attribute, and then attribute copy to the animated geo; if it is the best way to do it) ?

 

Here is what I'm writing :

 

v@newN = {0,1,0};
setattribtypeinfo(geoself(), "point", "newN", "normal");

With or without the timeshift the attribute value remain  {0,1,0} during animation. But I want the first frame to be a kind of rest vector for the entire sequence.

Or maybe I'm not doing it correctly.

[f1480187]

Hip-file? It is working for me. Make sure you are not testing by rotating around that axis and some deforming node is selected, not wrangle one.

[anim]

well it will work for any SOP that transforms attributes, like Transform SOP, Deformation Wrangle SOP, and others

however if you already have deforming geometry as an input, then just changing attribute qualifier will not change anything

in that case you can use Attribute Reorient SOP, where you can feed frozen geo with "rest" version of that attribute to second input

[Lewul]

Yes sorry I think I wasn't clear enough, indeed I already have deforming geometry.

The Attribute Reorient SOP is working great, thank a lot !