Vector3f TrackballCamera::pos(const Vector3f &p, int x, int y)
{
int viewport[4] = { };
glGetIntegerv(GL_VIEWPORT, viewport);
if (changed) calcMatr();
Vector4f v = Vector4f(p) * matr;
v.Cartesian();
v.x = ((float)x - viewport[0]) / viewport[2]*2.0f - 1.0f;
v.y = ((viewport[3] - (float)y) - viewport[1]) / viewport[3]*2.0f - 1.0f;
v.w = 1.0f;
v *= matr_inv;
v.Cartesian();
return Vector3f(v);
}
Vector3f Viewer3D::pos(const Vector3f &p, int x, int y)
{
float viewport[4] = { };
glGetFloatv(GL_VIEWPORT, viewport);
if (changed) calcMatr();
Vector4f v = Vector4f(p) * matr;
v.Cartesian();
float winZ = (1.0f + v.z) * 0.5f;
v.x = ((float)x - viewport[0]) / viewport[2]*2.0f - 1.0f;
v.y = ((viewport[3] - (float)y) - viewport[1]) / viewport[3]*2.0f - 1.0f;
v.z = 2.0f*winZ - 1.0f;
v.w = 1.0f;
v *= matr_inv;
v.Cartesian();
return Vector3f(v);
}
