Ive converted some code from opengl and need someone to look over the code to see if there are any mistakes. Im in Directx 11 with a LH coordinate system.
GetPickRay( float sx, float sy, float fov, float width, float height )
{
float d = 1.0f/IvTan(fov*kPI/360.0f);
float aspect = width/height;
Vector3 viewPoint( 2.0f*aspect*sx/width - aspect, -2.0f*sy/height + 1.0f, d );
viewPoint = mViewToWorldMatrix.TransformPoint( viewPoint );
return viewPoint - mEyePoint;
}
OnMouseDown(WPARAM btnState, int x, int y)
{
mLastMousePos.x = x;
mLastMousePos.y = y;
Vector3 ray = GetPickRay( (float) x, (float) y, 45.0f,(float) mClientWidth,(float)mClientHeight );
// compute intersection with z=0 plane
float t = -mEyePoint.z/ray.z;
mClick = mEyePoint + t*ray;
moveIT = XMMatrixTranslation(mClick.x,mClick.y,mClick.z);
SetCapture(mhMainWnd);
}
Vector3 mUp(0.0f,1.0f,0.0f);
Vector3 view = Vector3(0.0f,0.0f,0.0f) - mEyePoint;
Vector3 right;
Vector3 viewUp;
view.Normalize();
right = view.Cross( mUp );
right.Normalize();
viewUp = right.Cross( view );
viewUp.Normalize();
Matrix33 rotate;
//almost similar to a view matrix accept no negating eye point and dotting with uvw
rotate.SetRows( right, viewUp, view );
mViewToWorldMatrix.Rotation(rotate);
// set translation (eye position)
mViewToWorldMatrix(0,3) = mEyePoint.x;
mViewToWorldMatrix(1,3) = mEyePoint.y;
mViewToWorldMatrix(2,3) = mEyePoint.z;
