learning jitter expressions


    Feb 24 2010 | 9:18 am
    I try to learn jitter expressions because there the core of jitter . Can you recommend good books (maths or other anything) that can help me to understand these "mysterious" expressions.
    thanks in advance

    • Feb 24 2010 | 11:35 am
      the easiest way is to create a new object and start typing either "cv.jit.___" or "jit.___" and select any of the object expressions that appear in the drop-list. then (in edit mode) alt+click the object and learn more about, copy it, edit it-whatever you please.
    • Feb 24 2010 | 12:05 pm
      I speak about jit.expr
    • Feb 24 2010 | 2:02 pm
      oh-i'm sorry. my bad.
      i have no idea. :(
    • Feb 24 2010 | 6:11 pm
      there's plenty of examples on the forum, as well as in the jitter recipes.
      other that that, i would say, stay tuned to the cycling74 articles website.
    • Feb 24 2010 | 6:41 pm
      Thanks , I know there plenty of articles but the problem is that i don't have a knowledge base and when i want to put my ideas in practice i realize that i'm lost.
      The forum is like a candy store. A lot of tastes hide the ingredients :)
    • Feb 25 2010 | 11:20 am
      I speak about expressions like :
      expr " pow(min(norm[0] , sqrt(norm[1])) , 2.0)"
      or
      expr sin(norm[0]*(2*PI))*sin(norm[1]*(2*PI))
      or
      DEGTORAD, RADTODEG, E, LN2, LN10, LOG10E, LOG2E,
      I was not very good of math ( I know basic geometry) so i tried to find some good books. I need to study analytic geometry or matrices? Can you recommend some books that will illuminate me ?
      Thanks
      gobo
    • Feb 25 2010 | 6:01 pm
      i can't really think of a much better resource than the googles.
      this guy's site is chock full of information and equations:
      most of these geometric shapes can be created with jit.expr and jit.gl.mesh.
      for a more concrete example, recently i wanted to create a spiral shape, so i googled spiral equations, or something like that, and found this:
      http://www.mathematische-basteleien.de/spiral.htm
      on down the page if found the spiral equation in needed
      x=tcos(6t) y=tsin(6t) z=t
      i plugged this into jit.expr using norm[0]*5 in place of t (found by experimenting), and plugged the output into jit.gl.mesh. viola.
      'jit.expr @expr (norm[0]*5)*cos(6*(norm[0]*5)) (norm[0]*5)*sin(6*(norm[0]*5)) (norm[0]*5)'
      hopefully this is helpful, but if not, as mentioned, stay tuned.
    • Feb 26 2010 | 11:57 am
      Thanks , I will try to learn using trial and error. if I will be blocked , I will ask on forum.
    • Feb 26 2010 | 4:05 pm
      @robtherich can you expand on how this works in patch form. i just tried to code this as u describe and i get nothing...
      could you post your spiral patch so we can get an idea of how u implemented this.
      thanks
      j
    • Feb 26 2010 | 6:39 pm
    • Feb 26 2010 | 7:48 pm
      thanks v much for the share.
      j