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Index › Programming Questions & Help › OpenGL and 3D Libraries › Workaround for polygon fill problems
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Workaround for polygon fill problems? (Read 613 times)
godzig
Workaround for polygon fill problems?
Feb 13th, 2006, 6:35pm  
I'm trying to fill a polygon that has 2 bezier vertices and bumping into all kinds of trouble.  It's not Bug 111 (wherein polygons perpendicular to z-axis don't fill) and it's not quite bug 97 (wherein duplicate vertices cause trouble). Though the suggested fix for bug 97 (add some more vertices that aren't quite on the same spot as others) did cause more of my shape to be filled, but unfortunately not all of it.

here's the simplified version, any suggestions would be wonderful:

void setup(){
 size(500,500,P3D);
 stroke(0);
 fill(255,0,0);
}

void draw(){
 translate(width/2,height/2,0);
 background(255);
 for (int i=0; i<20; i++){
   pushMatrix();
   rotateZ(i*((2*PI)/20));
   translate(0,40,0);    
   beginShape(POLYGON);
   vertex(-5,0,0);
   bezierVertex((mouseX-250)/4,60,0,(mouseY-250)/4,65,0,-5,130,0);
   vertex(5,130,0);
   bezierVertex(10+(mouseY-250)/4,65,0,10+(mouseX-250)/4,60,0,5,0,0);
   endShape();
   popMatrix();
 }
}
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Ricard
Re: Workaround for polygon fill problems?
Reply #1 - Feb 13th, 2006, 7:06pm  
workaround using Geomerative

hi there, I've written a library that can handle shapes, the filling works with it.

Although this should be also marked as a bug.

Instructions:
1 - download and install Geomerative (for any questions don't doubt on asking)
2 - use the following code:
Code:

 import geomerative.*;
 
 void setup(){
  size(500,500,P3D);
  stroke(0);
  fill(255,0,0);
}
 
void draw(){
  translate(width/2,height/2,0);
  background(255);
  for (int i=0; i<20; i++){
    pushMatrix();
    rotateZ(i*((2*PI)/20));
    translate(0,40,0);  
    RShape shp = new RShape();
    shp.addMoveTo(-5,0);
    shp.addBezierTo((mouseX-250)/4,60,(mouseY-250)/4,65,-5,130);
    shp.addLineTo(5,130);
    shp.addBezierTo(10+(mouseY-250)/4,65,10+(mouseX-250)/4,60,5,0);
    shp.draw(g);
    popMatrix();
  }
}
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WWW  
godzig
Re: Workaround for polygon fill problems?
Reply #2 - Feb 13th, 2006, 7:39pm  
Worked like a charm!  I was a little nervous about defining it as a 2D shape, but it rotates every which way beautifully.

Thank you very much, Ricard.
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