// public static double GetCoord(double i1, double i2, double w1, double w2, double p)
// {
// return ((p - i1) / (i2 - i1)) * (w2 - w1) + w1;
// }
public override Vector2D GetTexCoord(Vector3D p, uint subIdx)
{
p = p - origin;
Vector3D.RotX(1.5, ref p.Y, ref p.Z);
Vector3D.RotZ(-2.5, ref p.X, ref p.Y);
double phi = Math.Acos(p.Z / radius);
double S = Math.Sqrt(p.X * p.X + p.Y * p.Y);
double theta;
if (p.X > 0)
{
theta = Math.Asin(p.Y / S);//Atan(py/px);
}
else
{
theta = Math.PI - Math.Asin(p.Y / S);// Math.Atan(py / px);
}
if (theta < 0)
{
theta = 2.0 * Math.PI + theta;
}
double x1 = Vector3D.GetCoord(0.0, Math.PI * 2.0,
0.0, 1 /*imgBitmap.Width - 1*/, theta);
double y1 = Vector3D.GetCoord(0.0, Math.PI, 0.0,
1 /*imgBitmap.Height - 1*/, phi);
// NOTE: Do clamping etc. elsewhere
return(new Vector2D(x1, y1));
/*int i1 = (int)x1, j1 = (int)y1;
* if (i1 >= 0 && j1 >= 0 && i1 < imgBitmap.Width &&
* j1 < imgBitmap.Height)
* {
* Color clr = imgBitmap.GetPixel(i1, j1);
* color.x = clr.R;
* color.y = clr.G;
* color.z = clr.B;
* }*/
}
public override Vector2D GetTexCoord(Vector3D p, uint subIdx)
{
double dx = 1; // imgBitmap.Width;
double dy = 1; // imgBitmap.Height;
Vector3D U;
Vector3D V;
Vector3D v2;
double distp = 0;
U = points[triangles[subIdx].P3] - points[triangles[subIdx].P2];
v2 = p - points[triangles[subIdx].P2];
distp = Vector3D.modv(points[triangles[subIdx].P2] - p);
V = points[triangles[subIdx].P1] - points[triangles[subIdx].P2];
double dU = Vector3D.modv(U);
double dV = Vector3D.modv(V);
U.Normalize();
v2.Normalize();
double cost = Vector3D.Dot(U, v2);
double t = Math.Acos(cost);
double distY = 0, distX = 0;
distY = dU - distp * Math.Cos(t);
distX = dV - distp * Math.Sin(t);
double x1 = 0;
double y1 = 0;
int tIdx = (int)subIdx * 3;
y1 = Vector3D.GetCoord(0, dU, tCoords[tIdx + 2].Y, tCoords[tIdx + 1].Y, distY);
x1 = Vector3D.GetCoord(0, dV, tCoords[tIdx].X, tCoords[tIdx + 1].X, distX);
return(new Vector2D(x1, y1));
}