Garrett

Trying to understand how nurbs work. I'm using Andrew Bensons patchs manipulator and catchnurbs but catchnurbs is getting me closer to what I want. I've swapped out the sound for video to control the nurbs but something I can't figure out is how Andrews original seems to grow from the centre of the jit.window and mine is always right, above and forward of this. Mine is how I would expect it to work but how is Andrews being corrected? How would I offset mine to correct it? Thanks in advance

Trying to understand how nurbs work.  I'm using Andrew Bensons patchs manipulator and catchnurbs but catchnurbs is getting me closer to what I want. I've swapped out the sound for video to control the nurbs but something I can't figure out is how Andrews original seems to grow from the centre of the jit.window and mine is always right, above and forward of this.  Mine is how I would expect it to work but how is Andrews being corrected?  How would I offset mine to correct it?  Thanks in advance

understanding-how-nurbs-work

Don't know about Andrew's but you can use the 'position' attribute on nurbs, as well as rotate and scale etc. Its in the nurbs help file.

as well as the position/scale/rotation attributes on the entire scene, send them to jit.gl.render. There's "camera X Y Z" as well, where (I believe) 0. 0. 4. is the default. Sending these commands will keep the whole scene in proportion, helpful when you've got multiple nurbs going :)

as well as the position/scale/rotation attributes on the entire scene, send them to jit.gl.render. There's "camera X Y Z" as well, where (I believe) 0. 0. 4. is the default. Sending these commands will keep the whole scene in proportion, helpful when you've got multiple nurbs going  :)


Yes I started playing with position shortly after, I did think of using the equivalent of glortho and remapping the coordinates from 0 to 1 instead of -1 to 1 (if I could find what the equivalent is for jit.gl.render) but I was wondering if there was a way of correcting this within the matrix itself? Is there a way to apply a formula to all the cells matrix? Something like (a x 2) - 1 would correct this but I don't know how to apply it.

Yes I started playing with position shortly after, I did think of using the equivalent of glortho and remapping the coordinates from 0 to 1 instead of -1 to 1 (if I could find what the equivalent is for jit.gl.render) but I was wondering if there was a way of correcting this within the matrix itself?  Is there a way to apply a formula to all the cells matrix? Something like (a x 2) - 1 would correct this but I don't know how to apply it.

jit.expr can do pretty much everything you need for matrix math:

jit.expr @op * @val 2.
|
jit.expr @op - @val 1.

ah good I was starting to look at the right thing but getting bit confused with jit.dimmap. Thanks.

ah good I was starting to look at the right thing but getting  bit confused with jit.dimmap.  Thanks.

Understanding how nurbs work