public static ConvexSurface loadCylinder(int sides, double height, double radius) {
ConvexSurface surface = new ConvexSurface();
surface.faces = new Face[sides + 2];
double twoPI = 2 * 3.1415926535897932384626433832795;
double alpha, theta;
for (int i = 0; i < sides; i++) {
alpha = i * (twoPI / sides);
theta = (i + 1) * (twoPI / sides);
double[] face = {
radius * Math.cos(alpha),
-height / 2,
radius * Math.sin(alpha),
radius * Math.cos(alpha),
height / 2,
radius * Math.sin(alpha),
radius * Math.cos(theta),
height / 2,
radius * Math.sin(theta),
radius * Math.cos(theta),
-height / 2,
radius * Math.sin(theta),
};
surface.faces[i] = new Face(face, 4);
}
double[] top = new double[sides * 3];
double[] bottom = new double[sides * 3];
for (int i = 0; i < sides; i++) {
alpha = i * (twoPI / sides);
top[i * 3 + 0] = radius * Math.cos(alpha);
top[i * 3 + 1] = height / 2;
top[i * 3 + 2] = radius * Math.sin(alpha);
bottom[i * 3 + 0] = radius * Math.cos(alpha);
bottom[i * 3 + 1] = -height / 2;
bottom[i * 3 + 2] = radius * Math.sin(alpha);
}
surface.faces[sides + 0] = new Face(top, sides);
surface.faces[sides + 1] = new Face(bottom, sides);
surface.SURFACE_TYPE = ConvexSurface.CYLINDER;
surface.radius = (float) radius;
surface.height = (float) height;
surface.breakFaces();
surface.loadEdgeIndexing();
surface.loadPointIndexing();
return surface;
}
public static ConvexSurface loadSphere(int slices, int stacks, double radius) {
ConvexSurface surface = new ConvexSurface();
surface.faces = new Face[slices * stacks];
double twoPI = 2 * 3.1415926535897932384626433832795;
double thetaA, phiA, thetaB, phiB;
/*
r = [0, infinity)
theta = [0, 2*pi)
phi = [0, pi]
x = r*Math.cos(theta)*Math.sin(phi)
y = r*Math.cos(phi)
z = r*Math.sin(theta)*Math.sin(phi)
*/
for (int i = 0; i < stacks; i++) {
for (int j = 0; j < slices; j++) {
thetaA = j * (twoPI / slices);
thetaB = (j + 1) * (twoPI / slices);
phiA = i * (twoPI / 2 / stacks);
phiB = (i + 1) * (twoPI / 2 / stacks);
double[] face = {
radius * Math.cos(thetaA) * Math.sin(phiA),
radius * Math.cos(phiA),
radius * Math.sin(thetaA) * Math.sin(phiA),
radius * Math.cos(thetaA) * Math.sin(phiB),
radius * Math.cos(phiB),
radius * Math.sin(thetaA) * Math.sin(phiB),
radius * Math.cos(thetaB) * Math.sin(phiB),
radius * Math.cos(phiB),
radius * Math.sin(thetaB) * Math.sin(phiB),
radius * Math.cos(thetaB) * Math.sin(phiA),
radius * Math.cos(phiA),
radius * Math.sin(thetaB) * Math.sin(phiA)
};
surface.faces[i * slices + j] = new Face(face, 4);
}
}
surface.SURFACE_TYPE = ConvexSurface.SPHERE;
surface.radius = (float) radius;
surface.breakFaces();
surface.loadEdgeIndexing();
surface.loadPointIndexing();
return surface;
}
