www.iforce2d.net

Can I change the code in library files, for example, in joins ?

You can also see how it works by referring to the standard Box2D testbed.

Yes I found a solution in the source code testbed, and then I saw a piece of code I was looking for in your code

You can say me about World.DrawDebugData();

a little normal documentation for box2d. I didn't think it works that simple

I watched all!
I haven't found this scene here.

iforce2d What is the file include this scene??
Please give me this code.

Please look at the source code (DebugDraw.cpp), all shapes are already implemented.

I use code from DebugDraw.cpp originally!!

it would be great if you added in the example drawing the polygon

Questions about rendering are not really the topic for this forum. The method will depend on your rendering API and there are many different cases. If you are using SDL2, maybe you could try the example I made: https://www.iforce2d.net/rube/?panel=loaders I did it using your example. But in your ex...

How about just drawing one single thing at a time, I don't see how you can debug a crazy situation with dozens of things all moving around that fast. Start small.

I did a lot of things for clarity. One object of the same flies

I try another code: if (shape->GetType() == b2Shape::e_polygon) // Если полигон { b2PolygonShape* poly = (b2PolygonShape*)shape; int count = poly->GetVertexCount(); b2Vec2* vertices= (b2Vec2*)poly->m_vertices; for (int i = 0; i < count; i++) { vertices[i] = poly->GetVertex(i); } debugDraw.DrawPolygo...

for (b2Body* it = World.GetBodyList(); it != 0; it = it->GetNext()) { for (b2Fixture *fixture = it->GetFixtureList(); fixture; fixture = fixture->GetNext()) { b2Shape *shape = (b2Shape*)fixture->GetShape(); if (shape->GetType() == b2Shape::e_polygon) // { b2PolygonShape* poly = (b2PolygonShape*)sha...