Reputation: 9634
I have the following function code:
D3DXVECTOR3 Mouse::GetClickDirection(D3DXMATRIX projMatrix, D3DXMATRIX viewMatrix, D3DXVECTOR3 cameraPosition)
{
POINT mousePoint;
GetCursorPos(&mousePoint);
ScreenToClient(hwnd, &mousePoint);
float x = ((mousePoint.x * 2.0f) / (float)backBufferWidth) - 1.0f;
float y = ((mousePoint.y * -2.0f) / (float)backBufferHeight) + 1.0f;
D3DXVECTOR3 mouseClip = D3DXVECTOR3(x, y, 1.0f);
D3DXMATRIX invViewMatrix;
D3DXMatrixInverse(&invViewMatrix, 0, &viewMatrix);
D3DXMATRIX invProjMatrix;
D3DXMatrixInverse(&invProjMatrix, 0, &projMatrix);
D3DXMATRIX inversedMatrix = invViewMatrix * invProjMatrix;
D3DXVECTOR3 mouseWorldSpace;
D3DXVec3TransformCoord(&mouseWorldSpace, &mouseClip, &inversedMatrix);
D3DXVECTOR3 direction = mouseWorldSpace - cameraPosition;
D3DXVec3Normalize(&direction, &direction);
system("CLS");
std::cout << "sX: " << x << std::endl;
std::cout << "sY: " << y << std::endl;
std::cout << "X: " << direction.x << std::endl;
std::cout << "Y: " << direction.y << std::endl;
std::cout << "Z: " << direction.z << std::endl;
return direction;
}
I'm trying to calculate and create a directional ray based on the x and y screen point that the user has clicked on in my DirectX 3D app. So far, the printed results seems to indicate that my calculations are wrong as the Z value is always around 0.9 and I have no idea why. What exactly am I doing wrong here? Please help. Thanks
Upvotes: 1
Views: 209
Reputation: 6793
I think your inverse matrix calculation is backwards.
D3DXMATRIX inversedMatrix = invProjMatrix * invViewMatrix;
Upvotes: 2