Very new to Gamemaker so asking this question just to confirm I am on the right track. I want to create a half pipe (U shaped) ramp that the player will go up and down in using physics. I know that GM doesn't like concave shapes when it comes to implementing basic Physics fixtures so based on my research the solution is to code a series of overlapping polygonal convex fixtures that are bound to the ramp sprite in order to achieve that U shape. If this seems like the best approach it would be great to know but if there are other solutions or ones you've seen it would be great to hear or see them. Thanks very much.