public void screen2spaceVecHud(float x, float y, float[] vec) {
float c[] = new float[3];
y = mViewport[3] - y;
GMath.unProject(x, y, 1.0f, mLookAtHud, 0, mProjectionHud, 0, mViewport, 0, c, 0);
vec[0] = c[0] - this.mCameraEyeHud[0];
vec[1] = c[1] - this.mCameraEyeHud[1];
vec[2] = c[2] - this.mCameraEyeHud[2];
}
public void screen2space(float x, float y, float[] spacecoords) {
float c[] = new float[3];
float f[] = new float[3];
y = mViewport[3] - y;
GMath.unProject(x, y, 1.0f, mLookAt, 0, mProjection, 0, mViewport, 0, f, 0);
GMath.unProject(x, y, 0.0f, mLookAt, 0, mProjection, 0, mViewport, 0, c, 0);
f[0] -= c[0];
f[1] -= c[1];
f[2] -= c[2];
float rayLength = (float) Math.sqrt(c[0] * c[0] + c[1] * c[1] + c[2] * c[2]);
// normalize
f[0] /= rayLength;
f[1] /= rayLength;
f[2] /= rayLength;
float dot1, dot2;
float pointInPlaneX = 0;
float pointInPlaneY = 0;
float pointInPlaneZ = 0;
float planeNormalX = 0;
float planeNormalY = 0;
float planeNormalZ = -1;
pointInPlaneX -= c[0];
pointInPlaneY -= c[1];
pointInPlaneZ -= c[2];
dot1 =
(planeNormalX * pointInPlaneX)
+ (planeNormalY * pointInPlaneY)
+ (planeNormalZ * pointInPlaneZ);
dot2 = (planeNormalX * f[0]) + (planeNormalY * f[1]) + (planeNormalZ * f[2]);
float t = dot1 / dot2;
f[0] *= t;
f[1] *= t;
spacecoords[0] = f[0] + c[0];
spacecoords[1] = f[1] + c[1];
}
