Game Development Stack Exchange is a question and answer site for professional and independent game developers. It only takes a minute to sign up.
Sign up to join this community
Is there a way to scale the bodies made from vertexes (like a guitar), i was trying to multiply each vertex point by the scale value but c++ mark an assertion failed, is there a mehtod to do this?
I have done it, but i want to make a mirror body, but i cant do it :/ just multplying it by -1 or 1 it doesnt run :/
Section 4.4 of Box2D manual says:
You must create polygons with a counter clockwise winding (CCW). We must be careful because the notion of CCW is with respect to a right-handed coordinate system with the z-axis pointing out of the plane. This might turn out to be clockwise on your screen, depending on your coordinate system conventions.
If you are taking a shape and mirroring the coordinates you are probably changing the winding and that is the reason it fails. But as you didn't provide an error log (the box2d c/c++ assertion) I can't be sure.
I believe you can perform the mirroring you want if you invert the array of vertices too, before creating the box2d shape. What I mean is, if you have [v1, v2, v3] then by inverting the array you will have [v3, v2, v1].
Hope it helps.
