public aVertex cross(aVertex operand)
{
aVertex toReturn = new aVertex();
toReturn.set(y * operand.z - z * operand.y, z * operand.x - x * operand.z, x * operand.y - y * operand.x);
return(toReturn);
}
public static aVertex operator +(aVertex o1, aVertex o2)
{
aVertex toReturn = new aVertex();
toReturn.set(o1.x + o2.x, o1.y + o2.y, o1.z + o2.z);
return(toReturn);
}
public static aVertex operator *(aVertex o1, float o2)
{
aVertex toReturn = new aVertex();
toReturn.set(o1.x * o2, o1.y * o2, o1.z * o2);
return(toReturn);
}
public aVertex norm()
{
aVertex toReturn = new aVertex();
float mag = this.mag();
toReturn.set(x / mag, y / mag, z / mag);
return(toReturn);
}
public bool loadSphere(float size, int numFaces)
{
// Loads vertices defining sphere with radius size and the given number of faces
clear();
int nPhi = (int)(Math.Sqrt(numFaces / 2.0f));
int nTht = nPhi * 2;
float phi0, tht0, phi1, tht1;
_numVertices = 6 * nPhi * nTht;
// Create triangles by rotating about sphere
for (int i = 0; i < nPhi; i++)
{
// Construct vertices for each latitude
for (int j = 0; j < nTht; j++)
{
// Redeclare to avoid reference crossover
aVertex vert0 = new aVertex();
aVertex vert1 = new aVertex();
aVertex vert2 = new aVertex();
aVertex vert3 = new aVertex();
// Construct vertices for each longitude, beginning with spherical coordinates
phi0 = (((float)i) / ((float)nPhi)) * (float)Math.PI;
phi1 = (((float)(i + 1)) / ((float)nPhi)) * (float)Math.PI;
tht0 = (((float)j) / ((float)nTht)) * 2 * (float)Math.PI;
tht1 = (((float)(j + 1)) / ((float)nTht)) * 2 * (float)Math.PI;
// Create vertices in cartesian from spherical coordinates
vert0.set(size * (float)Math.Sin(phi0) * (float)Math.Cos(tht0), size * (float)Math.Cos(phi0), -1 * size * (float)Math.Sin(phi0) * (float)Math.Sin(tht0));
vert1.set(size * (float)Math.Sin(phi1) * (float)Math.Cos(tht0), size * (float)Math.Cos(phi1), -1 * size * (float)Math.Sin(phi1) * (float)Math.Sin(tht0));
vert2.set(size * (float)Math.Sin(phi1) * (float)Math.Cos(tht1), size * (float)Math.Cos(phi1), -1 * size * (float)Math.Sin(phi1) * (float)Math.Sin(tht1));
vert3.set(size * (float)Math.Sin(phi0) * (float)Math.Cos(tht1), size * (float)Math.Cos(phi0), -1 * size * (float)Math.Sin(phi0) * (float)Math.Sin(tht1));
// Specify triangles
_vertices.Add(vert0); _vertices.Add(vert2); _vertices.Add(vert1);
_vertices.Add(vert0); _vertices.Add(vert3); _vertices.Add(vert2);
_texCoords.Add(new aTexCoord((float)(tht0 / (2.0f * Math.PI)), (float)(phi0 / Math.PI)));
_texCoords.Add(new aTexCoord((float)(tht1 / (2.0f * Math.PI)), (float)(phi1 / Math.PI)));
_texCoords.Add(new aTexCoord((float)(tht0 / (2.0f * Math.PI)), (float)(phi1 / Math.PI)));
_texCoords.Add(new aTexCoord((float)(tht0 / (2.0f * Math.PI)), (float)(phi0 / Math.PI)));
_texCoords.Add(new aTexCoord((float)(tht1 / (2.0f * Math.PI)), (float)(phi0 / Math.PI)));
_texCoords.Add(new aTexCoord((float)(tht1 / (2.0f * Math.PI)), (float)(phi1 / Math.PI)));
}
}
refreshNormals();
return(true);
}
