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Sphere primitive

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codeanticode
2011-11-17 02:27:54 +00:00
parent 5c96228d11
commit a9ce7ef015
1 changed files with 77 additions and 0 deletions
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java/libraries/opengl/src/processing/opengl/PShape3D.java
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@@ -1021,6 +1021,12 @@ public class PShape3D extends PShape {
}
}
public void setSphereRadius(float radius) {
if (params != null) {
params[0] = radius;
modified = true;
}
}
// done with primitives -----------------------------------------------
@@ -2099,8 +2105,79 @@ public class PShape3D extends PShape {
}
protected void tessellateSphere() {
float r = params[0];
int nu = 30;
int nv = 30;
float startLat = -90;
float startLon = 0.0f;
float latInc = 180.0f / nu;
float lonInc = 360.0f / nv;
float u, v;
float phi1, phi2;
float theta1, theta2;
PVector p0 = new PVector();
PVector p1 = new PVector();
PVector p2 = new PVector();
for (int col = 0; col < nu; col++) {
phi1 = (startLon + col * lonInc) * DEG_TO_RAD;
phi2 = (startLon + (col + 1) * lonInc) * DEG_TO_RAD;
for (int row = 0; row < nv; row++) {
theta1 = (startLat + row * latInc) * DEG_TO_RAD;
theta2 = (startLat + (row + 1) * latInc) * DEG_TO_RAD;
p0.x = PApplet.cos(phi1) * PApplet.cos(theta1);
p0.y = PApplet.sin(theta1);
p0.z = PApplet.sin(phi1) * PApplet.cos(theta1);
p1.x = PApplet.cos(phi1) * PApplet.cos(theta2);
p1.y = PApplet.sin(theta2);
p1.z = PApplet.sin(phi1) * PApplet.cos(theta2);
p2.x = PApplet.cos(phi2) * PApplet.cos(theta2);
p2.y = PApplet.sin(theta2);
p2.z = PApplet.sin(phi2) * PApplet.cos(theta2);
normal(p0.x, p0.y, p0.z);
u = PApplet.map(phi1, TWO_PI, 0, 0, 1);
v = PApplet.map(theta1, -HALF_PI, HALF_PI, 0, 1);
addVertex(r * p0.x, r * p0.y, r * p0.z, u, v);
normal(p1.x, p1.y, p1.z);
u = PApplet.map(phi1, TWO_PI, 0, 0, 1);
v = PApplet.map(theta2, -HALF_PI, HALF_PI, 0, 1);
addVertex(r * p1.x, r * p1.y, r * p1.z, u, v);
normal(p2.x, p2.y, p2.z);
u = PApplet.map(phi2, TWO_PI, 0, 0, 1);
v = PApplet.map(theta2, -HALF_PI, HALF_PI, 0, 1);
addVertex(r * p2.x, r * p2.y, r * p2.z, u, v);
p1.x = PApplet.cos(phi2) * PApplet.cos(theta1);
p1.y = PApplet.sin(theta1);
p1.z = PApplet.sin(phi2) * PApplet.cos(theta1);
normal(p0.x, p0.y, p0.z);
u = PApplet.map(phi1, TWO_PI, 0, 0, 1);
v = PApplet.map(theta1, -HALF_PI, HALF_PI, 0, 1);
addVertex(r * p0.x, r * p0.y, r * p0.z, u, v);
normal(p2.x, p2.y, p2.z);
u = PApplet.map(phi2, TWO_PI, 0, 0, 1);
v = PApplet.map(theta2, -HALF_PI, HALF_PI, 0, 1);
addVertex(r * p2.x, r * p2.y, r * p2.z, u, v);
normal(p1.x, p1.y, p1.z);
u = PApplet.map(phi2, TWO_PI, 0, 0, 1);
v = PApplet.map(theta1, -HALF_PI, HALF_PI, 0, 1);
addVertex(r * p1.x, r * p1.y, r * p1.z, u, v);
}
}
tessellateTriangles();
}
protected void copyInDataToTessData() {