-
Position point to rotation value
Hi again,
I found this code from mr.Dan, that calculate point position to rotation.
Here is my situation, “OtherComp” sized 1920×1080.
animated keyframe x 0 to another keyframe x 1920i would like to link this point i to ccsphere y rotation, but it cant get it rotate at last key point.
it give only 114.6 degree. it rotate not end to end. 🙁Thank you.
madliman
x = comp("OtherComp").layer("line").effect("Write-on")("Brush Position")[0] /// X=0,Y=540
360*x/(Math.PI*width) -
7 Replies
-
I think you just need to change the last line to this:
360*x/width
Dan
-
Thank you very much mr.Dan,
code work for X position, but why cant we put same code to Y as height?
-
For y, I guess it would be like this:
y = comp(“OtherComp”).layer(“line”).effect(“Write-on”)(“Brush Position”)[1];
360*y/heightDan
-
Dan, here is my file i would like to do.. for Y i think it work great. X rotation i tried to do so.. please guide me mr.Dan..
5150_mappointing.aep.zip
Thank you -
Sorry, I’m not sure what it is that you’re trying to do.
Dan
-
anyway thank you for X rotate code Dan. 🙂
madliman
-
I’m not sure if this is what you’re looking for, but it may help. These expressions should keep the sphere oriented so that the brush position is centered.
// shpere’s x rotation
y = comp(“Comp 1”).layer(“Worldmap.jpg”).effect(“Write-on”)(“Brush Position”)[1];
(y – height/2)*180/height// sphere’s y rotation
x = comp(“Comp 1”).layer(“Worldmap.jpg”).effect(“Write-on”)(“Brush Position”)[0];
(width/2 – x)*360/widthThe key is that the span for the x rotation is only 180 degrees.
I hope that helps.
Dan
Reply to this Discussion! Login or Sign Up