maths::C_Ray C_Camera::GetRayToNearPlane(float x, float y) const
{
    maths::C_Ray ray;

    maths::C_Matrix4 invMV = ComputeInverseMatrix();

    maths::C_Matrix4 mvp = m_Matrix * m_ProjectionMatrix;
    maths::C_Frustum frustum = mvp.ExtractFrustum();

    maths::C_Vector3 points[8];
    frustum.GetCornerPoints(points);

    float nx = 1.0f - x;
    float ny = 1.0f - y;

    maths::C_Vector3 target = points[0] * nx * ny + points[1] * x * ny + points[2] * x * y + points[3] * nx * y;

    ray.m_Position.Set(invMV.Cell[12], invMV.Cell[13], invMV.Cell[14]);
    ray.m_Direction = (target - ray.m_Position);
    ray.m_Direction.Normalize();

    ray.m_Position.Set(invMV.Cell[12], invMV.Cell[13], invMV.Cell[14]);

    return ray;
}