Feature: Rotation visualization for Ball 2d collider in debug mode about rapier HOT 4 CLOSED

Thanks for sharing your investigation, that helps! Right now I'm not sure either about how to expose it 😅, I might have ideas when I'll have encountered this codebase more.

I added the tag https://github.com/dimforge/rapier/releases/tag/v0.20.0.

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Thanks for the suggestion ! In order to validate a path to implementation, I'd like to discuss current behaviour:

Currently, the testbed demo 2d in javascript provides a rotation gizmo, but I'm not sure where this is originating from, as it's the only example having such debug info 🤔 .

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Your are right, there is already rotation gizmo implemented in debug renderer
https://docs.rs/rapier2d/latest/rapier2d/pipeline/struct.DebugRenderMode.html#associatedconstant.RIGID_BODY_AXES

But it looks like api to set flag is not exposes in TestbedApp, flag hard coded here in resource to bevy app:
https://github.com/dimforge/rapier/blob/master/src_testbed/debug_render.rs#L25

and there is no way to change it because resource is private for testbed crate, so question now how to expose those flags to user?

btw I don't see v0.20.0 tag, it looks like it is not tagged in repository, v0.19.0 is the last tag

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Your suggested patch is fine to me ! It's useful and discreet enough 👍 .

As you volunteered to submit a pull request I'm encouraging you to do so, otherwise I'll adopt it 😄

I'd welcome a comment like "// Draw a line to visualize rotation", because as you noticed this render would have a slightly different behaviour than the others.

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