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Index › Programming Questions & Help › OpenGL and 3D Libraries › strange diagonal line
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strange diagonal line (Read 814 times)
g00dnight
strange diagonal line
Feb 5th, 2010, 7:07am  
Hi,
when i'm using P3D with smooth(), there is a strange diagonal line appears in the sketch window. Can anyone help me? This is a problem code:
Code:

void setup()
{
 size(640,480,P3D);
 smooth();
}

void draw() {
  background(0);
  beginShape(QUADS);
  fill(#FFFFFF);
  vertex(0,0);
  vertex(width,0);
  fill(#11172C);
  vertex(width,height);
  vertex(0,height);
  endShape();
}


if i remove smooth() then line disappears.
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Cedric
Re: strange diagonal line
Reply #1 - Feb 5th, 2010, 7:12am  
your quad is made out of triangles. the diagonal line, is the little gap between these two triangles, that appears when using smooth. cause not only the outer edges get smoothed but also the edge of the two triangles.

you could do it like that and start with the smooth after you have drawn the background gradient shape :

void setup()
{
size(640,480,P3D);

}

void draw() {
 background(0);
 noSmooth();
 beginShape(QUADS);
 fill(#FFFFFF);
 vertex(0,0);
 vertex(width,0);
 fill(#11172C);
 vertex(width,height);
 vertex(0,height);
 endShape();
 smooth();
}
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g00dnight
Re: strange diagonal line
Reply #2 - Feb 5th, 2010, 7:19am  
thank you!
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