syzmatrix Posted August 19, 2010 Share Posted August 19, 2010 Hi everyone,long time no see. I have a little problem in Houdini. Assuming there is a curve, resampled, transformed,merged and skined,to generate a Tape. Now some of the tape face should be twisted. So how can i get each pair of points and rotate them (their center point is the rotate center and there skined point normal define the construction plane) thanks in advance. untitled.hip 1 Quote Link to comment Share on other sites More sharing options...
Macha Posted August 19, 2010 Share Posted August 19, 2010 Here is one solution but I am afraid it isn't stable. There are sometimes twists in the twist if you know what I mean. Perhaps it is good enough for the purpose? I'll see if I can come up with a quaternion solution instead... twist.hipnc Quote Link to comment Share on other sites More sharing options...
Macha Posted August 19, 2010 Share Posted August 19, 2010 (edited) This seems to work correctly now without twists in twists. twist.hipnc Edited August 19, 2010 by Macha Quote Link to comment Share on other sites More sharing options...
Macha Posted August 19, 2010 Share Posted August 19, 2010 and a screenshot Quote Link to comment Share on other sites More sharing options...
Macha Posted August 19, 2010 Share Posted August 19, 2010 Interestingly, with a little extra work we can twist objects around curves. twist.hipnc Quote Link to comment Share on other sites More sharing options...
syzmatrix Posted August 20, 2010 Author Share Posted August 20, 2010 oh!it is really wonderful work. Thank you very much Macha,you are really a master! here is my work inspired from your hip. Quote Link to comment Share on other sites More sharing options...
syzmatrix Posted August 20, 2010 Author Share Posted August 20, 2010 my work Quote Link to comment Share on other sites More sharing options...
rich_lord Posted February 12, 2012 Share Posted February 12, 2012 This is a super useful little technique for me. I`m trying to create a host of deformations which will follow curves. Something I dont understand about this setup is that if I copy a box onto the points, rather than a line, I get issues with orientation. I cant work out how to make sure the box is copied to the points in such a way they follow the direction of the curve, as well as twist with the normals. Anyone have any insight into this? box_twist.hipnc Quote Link to comment Share on other sites More sharing options...
rich_lord Posted February 27, 2012 Share Posted February 27, 2012 Ok, I just realised that you can pass an up vector into the objects if the curve points have an up attribute. Problem solved! Quote Link to comment Share on other sites More sharing options...
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