morping matrices - ctl-matrices

frank desben wrote on Fri, 27 March 2009 14:45hello all,

i use jit.gl.nurbs and distort them with the ctlmatrix matrix command.

i put matrices of the dimension 5*5 in the ctlmatrix.

and i interpolate between random control-matrixes
for that i use [line] and setcell to independly interpolate the cells between random numbers.
this is (although the matrix is quite small) computationally demanding as i change all the values for the ctl-matrices with a [metro 30] all the time.

Not sure about the optimization question, but one thought: if you use jit.spill to put your ctlmatrix into a list (like a multislider), then you can use the very powerful [pattr] to interpolate between entire sets of ctl-points, rather than the [line] and setcell for each. You won't have the same kind of individual control, but it could make certain morphing effects much easier. Use a [preset] and set @pattrstorage of it to the pattrstorage you're using. Then you can interpolate between stored slots/presets (here's where [line] or [mtr] can also be very handy). Just use jit.fill after the multislider to get the list back into matrix form, to go to the jit.gl.nurbs. (pattr does not support matrices directly.)

Also for lots more cool generative ctlmatrices, look into jit.bfg if you haven't already. This function is amazing and can save lots of work, and can generate all kinds of interesting functions with little work. Hook up a [counter] to the offset X offset Y commands (or a separate counter for each) and the matrix will "flow along" automatically through its functions.

You might also try jit.gl.mesh with these ctlmatrices as the vertex matrix, that also works great, and may be more optimized. Perhaps the jit.gl.nurbs does a lot more calculations than jit.gl.mesh, I'm not sure but I imagine so as there's lots of interpolation required.

Possibly these ideas will slow things down even more, but they sure are cool...