Forums Technical Discussion Copytopoint node driven by 3@transform?

Copytopoint node driven by 3@transform?

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jackdon4682
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In my case,

Instead of p@orient, I can combine Copytopoint nodes and adjust the rotation value with 3@transform.

But I'm a little confused that I find nothing with 3@transform in official manual,

Is it an attribute defined as a houdini known type?


matrix3 m = ident();

rotate(m, radians(chf("angel")), set(0,1,0));

3@transform = m; 

//p@orient = quaternion(m);

Attachments:
houdini_RotByTransform.gif (300.7 KB)
DrivenByTransform.png (946.8 KB)
I find @orient ，but nothing with @transform.png (148.3 KB)

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Xue_Yue
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Hello,
3 is not a vector type. You use 3@transform to write a 3x3 matrix (aka rotation matrix) which is called "transform". The rotation matrix called transform is a standard and can be interpreted by the copytopoints SOP in the same way as orient, or N or v etc.
There is also 4@ and 2@.
Edited by Xue_Yue - Sept. 11, 2024 09:52:17
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tamte
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jackdon4682
But I'm a little confused that I find nothing with 3@transform in official manual,
It's listed here, it can be 3x3 or 4x4 matrix
https://www.sidefx.com/docs/houdini/copy/instanceattrs#attributes [www.sidefx.com]
Tomas Slancik
CG Supervisor
Framestore, NY
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jackdon4682
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Xue_Yue
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Dear Xue_Yue , thanks for your detailed explanation~!
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jackdon4682
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tamte
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Hi, dear tamte, thanks so much for the url,

oooooh, that's it~!
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