Function PickNode

engine/gui/src/gui.cpp:4311–4339

    }

    bool PickNode(HScene scene, HNode node, float x, float y)
    {
        Vector4 scale((float) scene->m_Context->m_PhysicalWidth / (float) scene->m_Context->m_DefaultProjectWidth,
                (float) scene->m_Context->m_PhysicalHeight / (float) scene->m_Context->m_DefaultProjectHeight, 1, 1);
        Matrix4 transform;
        InternalNode* n = GetNode(scene, node);
        CalculateNodeTransform(scene, n, CalculateNodeTransformFlags(CALCULATE_NODE_BOUNDARY | CALCULATE_NODE_INCLUDE_SIZE | CALCULATE_NODE_RESET_PIVOT), transform);
        // DEF-3066 set Z scale to 1.0 to get a sound inverse node transform for picking
        transform.setElem(2, 2, 1.0f);
        transform = inverse(transform);
        Vector4 screen_pos(x * scale.getX(), y * scale.getY(), 0.0f, 1.0f);
        Vector4 node_pos = transform * screen_pos;
        const float EPSILON = 0.0001f;
        // check if we need to project the local position to the node plane
        if (dmMath::Abs(node_pos.getZ()) > EPSILON)
        {
            Vector4 ray_dir = transform.getCol2();
            // falsify if node is almost orthogonal to the screen plane, impossible to pick
            if (dmMath::Abs(ray_dir.getZ()) < 0.0001f)
            {
                return false;
            }
            node_pos -= ray_dir * (node_pos.getZ() / ray_dir.getZ());
        }
        return node_pos.getX() >= 0.0f
                && node_pos.getX() <= 1.0f
                && node_pos.getY() >= 0.0f
                && node_pos.getY() <= 1.0f;
    }

    bool IsNodeEnabled(HScene scene, HNode node, bool recursive)
    {