<Collide> causes a segmentation fault if the group has Lines inside of it

[Wizzerinus]

Description

Using a object inside a group with in any mode causes a segmentation fault when pview, egg2bam etc. is run. This happens even if the collide mode does not need to look at the line (i.e. Plane type is used)

Steps to Reproduce

• Create an egg file like this:

<CoordinateSystem> { Z-Up }

<VertexPool> Scene {
  <Vertex> 0 {
    1 0 0
  }
  <Vertex> 1 {
    0 1 0
  }
  <Vertex> 2 {
    1 1 1
  }
  <Vertex> 3 {
    0 0 1
  }
}
<Group> test {
  <Collide> test { Plane descend }
  <Group> inside {
    <Polygon> {
      <VertexRef> { 0 1 3 <Ref> { Scene } }
    }
    <Line> {
      <VertexRef> { 1 2 <Ref> { Scene } }
    }
  }
}

• Save as file.egg
• Run pview file.egg

If <Line> or <Collide> is removed everything works, having both causes a segmentation fault

Environment

• Operating system: Linux
• System architecture: 64x
• Panda3D version: 1.10.12 (just tested, 1.10.13 also has this issue)
• Installation method: pip
• Python version (if using Python): 3.11.3

[Wizzerinus]

Btw: I do not know if non-polygon objects also have this problem. It seems that the other two egg nodes that can exist in a group are Patch and PointLight (and theres that one technical type that should not be in an egg), but I don't know how theyre used, nor if they're common, and nor if they crash.

[rdb]

It's composite primitives that can't be triangulated, which is just lines - the egg loader enters an infinite loop trying to "triangulate" the lines.