Hi Norbo, I try to compile demos to try to progress with Bepu but I have errors in LineDrawer.cs : public void Deactivate(Line line) { line.ColorA = new Color(line.ColorA.R, line.ColorA.G, line.ColorA.B, 0); line.ColorB = new Color(line.ColorB.R, line.ColorB.G, line.ColorB.B, 0); } /// <summary> ///...