• Adobe After Effects Expressions

  intersect and sampleimage??

  Posted by Maurice Jansen on January 10, 2010 at 4:39 pm

  hi there all.

  i’m trying to raise my skills with expressions.
  my goal was to draw a line on a layer where a other layer intersect’s
  with the color’s of that layer.

  a too high goal for a expression roocky like me 😉

  so i first tried to simplify my goal by making my layer that has to be sampled just rotate in Y and make a different solidlayer(the dots) change color and place it self on the place where the 2 intersect. (i guess the picture explain my goal a bit more)

  the sampling is going well but the placement goes wrong.
  it never crosses the middle of the layer and foldback!

  it’s a bit hard for me to explain my goals i hope you understand what i mean.

  is this the way to go for my final goal see begin post or am i thinking to difficult

  grt
  Maurice

  

  

  for the color of the fill effect
---------
target=thisComp.layer("tobesampled2.jpg");
angletarget=thisComp.layer("tobesampled2.jpg").transform.yRotation;
angletargetRAD=degreesToRadians(angletarget);
distancetarget=10;
x=Math.sin(angletargetRAD)*distancetarget;
a=distancetarget*distancetarget;
b=x*x;
z=Math.sqrt(a+b);
XsamplePos=target.width/2-z;
target.sampleImage([XsamplePos, 300], [0.5, 0.5])

  for the position of the layer
---------
target=thisComp.layer("tobesampled2.jpg");
angletarget=thisComp.layer("tobesampled2.jpg").transform.yRotation+90;
angletargetRAD=degreesToRadians(hoeklaag);
distancetarget=50;
x=Math.tan(angletargetRAD)*distancetarget;
a=distancetarget*distancetarget;
b=x*x;
z=Math.sqrt(a+b);
XsamplePos=(target.width/2-z);
Xpos=XsamplePos;
Ypos=index;
[Xpos,Ypos,50]

  People saying they don’t make mistake’s often make nothing at all!

  Maurice Jansen replied 16 years, 3 months ago 1 Member · 0 Replies
• 0 Replies

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