In the new update it is important that the node_stack_top has the 1.0 as fifth value and the node_stack_bottom has the -1.0 as fifth value. Like so: // --- node definitions --- node_stack_top = 0.0, 7.2, 0.0, 0.0, 1.0, 0.0 node_stack_bottom = 0.0, -5.74338, 0.0, 0.0, -1.0, 0.0 Before it was: node_stack_top = 0.0, 7.2, 0.0, 0.0, 1.0, 0.0 node_stack_bottom = 0.0, -5.74338, 0.0, 0.0, 1.0, 0.0 the "-" was missing.