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3d diamond (Read 1134 times)
natenine
3d diamond
Jun 22nd, 2009, 8:47am  
Hello,
I would like to draw a 3d diamond, but I have no idea how to start it, can anyone help me?
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koogy
Re: 3d diamond
Reply #1 - Jun 22nd, 2009, 10:14am  
you need to work out what the coordinates of the points of your diamond are and which points connect to which other points... 2 square-based pyramids should do it, 6 points in total...

then have one array containing the points and another with the edges

iterate through the edge list drawing a line between the pairs of points...

http://en.wikipedia.org/wiki/Octahedron
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natenine
Re: 3d diamond
Reply #2 - Jun 22nd, 2009, 11:20am  
Thanks, but... I cannot see how I can cut the second pyramid, ill show what i have.

for now is just based in another code:

void setup() {
 size(800, 600, P3D);
 smooth();
}

void draw() {
 background(0);
 lights();
 translate(width / 2, height / 2);
 rotateY(map(mouseX, 0, width, 0, PI));
 rotateZ(map(mouseY, 0, height, 0, -PI));
 rotateX(map(mouseX-mouseY, 0, width, 0, PI*2));
 noStroke();
 noFill();
 stroke(255);
 strokeWeight(1);
 translate(0, -40, 0);
 drawCylinder(0, 150, 150, 8); // Draw a pyramid
}

void drawCylinder(float topRadius, float bottomRadius, float tall, int sides) {
 float angle = 0;
 float angleIncrement = TWO_PI / sides;
 beginShape(QUAD_STRIP);
 for (int i = 0; i < sides + 1; ++i) {
   vertex(topRadius*cos(angle), 0, topRadius*sin(angle));
   vertex(bottomRadius*cos(angle), tall, bottomRadius*sin(angle));
   angle += angleIncrement;
 }
 endShape();

 // If it is not a cone, draw the circular top cap
//  if (topRadius != 0) {
   angle = 0;
   beginShape(TRIANGLE_FAN);

   // Center point
   vertex(0, 0, 0);
   for (int i = 0; i < sides + 1; i++) {
     vertex(topRadius * cos(angle), 0, topRadius * sin(angle));
     angle += angleIncrement;
   }
   endShape();
//  }

 // If it is not a cone, draw the circular bottom cap
 if (bottomRadius != 0) {
   angle = 0;
   beginShape(TRIANGLE_FAN);

   // Center point
   vertex(0, tall+150, 0);
   for (int i = 0; i < sides + 1; i++) {
     vertex(bottomRadius * cos(angle), tall, bottomRadius * sin(angle));
     angle += angleIncrement;
   }
   endShape();
 }
}
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natenine
Re: 3d diamond
Reply #3 - Jun 22nd, 2009, 11:23am  
get it. thanks
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