Method GetPickLine

GTE/Graphics/Camera.cpp:37–68

}

bool Camera::GetPickLine(int32_t viewX, int32_t viewY, int32_t viewW, int32_t viewH, int32_t x, int32_t y,
    Vector4<float>& origin, Vector4<float>& direction) const
{
    if (viewX <= x && x <= viewX + viewW && viewY <= y && y <= viewY + viewH)
    {
        // Get the [0,1]^2-normalized coordinates of (x,y).
        float r = (static_cast<float>(x - viewX)) / static_cast<float>(viewW);
        float u = (static_cast<float>(y - viewY)) / static_cast<float>(viewH);

        // Get the relative coordinates in [rmin,rmax]x[umin,umax].
        float rBlend = (1.0f - r) * GetRMin() + r * GetRMax();
        float uBlend = (1.0f - u) * GetUMin() + u * GetUMax();

        if (IsPerspective())
        {
            origin = GetPosition();
            direction = GetDMin() * GetDVector() + rBlend * GetRVector() + uBlend * GetUVector();
            Normalize(direction);
        }
        else
        {
            origin = GetPosition() + rBlend * GetRVector() + uBlend * GetUVector();
            direction = GetDVector();
        }
        return true;
    }
    else
    {
        // (x,y) is outside the viewport.
        return false;
    }
}

void Camera::UpdatePVMatrix()
{