`editor.Brush`-> `List[geometry.Mesh]`

[snake-biscuits]

Visualising brushes would be really handy
Especially clips & triggers in map formats where they aren't renderable (IW & Titanfall engines)

Generating bounds for brushes would also be nice
Tho I think all brush representations have axial sides, which we can determine bounds from:

mins = sum((s.plane.normal * s.plane.distance for s in brush.sides[:6] if -1 in s.plane.normal), start=vec3())
maxs = sum((s.plane.normal * s.plane.distance for s in brush.sides[:6] if +1 in s.plane.normal), start=vec3())

Note: needs to be List[geometry.Mesh] to allow for multiple materials

[snake-biscuits]

I would also like a nicer __init__ for physics.Brush
utils.physics seems like the place to check convexity

Also:

SlicedBrush = namedtuple("SlicedBrush", ["front", "back"])

def slice(brush: Union[AABB, Brush], plane: Plane) -> SlicedBrush:
        ...