occasional crash: b2PolygonShape::ComputeMass () -> Assertion `m_count >= 3' failed.

[0XDE57]

(uncommon) sometimes shatter tries to create an asteroid polygon with less than 3 points.

java: /home/runner/work/gdx-box2d/gdx-box2d/gdx-box2d-box2d/jni/src/box2d-2.4.1/src/collision/b2_polygon_shape.cpp:300: virtual void b2PolygonShape::ComputeMass(b2MassData*, float) const: Assertion m_count >= 3' failed.

[0XDE57]

investigation.

1. creating a new polygon already checks, and will throw exception is less than 3 points / 6 vertices supplied.
2. added additional checks on vertices to ensure there are absolutely 3 points.

so how can there be less than 3 by the time the polygon is passed to box2D?

beginning to suspect collinear points... need to find exact poly to reproduce with.

another problem is no stack trace produced for this type of crash...