Convex Moment

cpConvexMoment.c

So I see two options right now:

Idea 1:

// add a convenience method to the API 
cpMakeBodyAndShape(mass, NUM_VERTS, verts){
	verts = AllThatConvexHullStuff(verts);
	moment = cpMomentForPoly(verts, otherNumber, mass, etc);
	
	body = cpSpaceAddBody(space, cpBodyNew(mass, moment));
	
	shape = cpSpaceAddShape(space, cpPolyShapeNew(body, NUM_VERTS, verts, cpvzero));
	
	return something?;
}

// this convenience method won't work for every situation, not sure if they are expected to add multiple shapes on their own if they want more than one on a body, etc...
// People using this might not understand the distinction between a shape and a body, which was always very clean in the API before. (you always make a body, then you add zero or more shapes to it)

Idea 2:

float PLACE_HOLDER_MOMENT = 7.0; // or whatever. If I want I can calculate this myself. Otherwise I can just leave this argument off the cpBodyNew and maybe it'll give it an infinite moment. 

body = cpSpaceAddBody(space, cpBodyNew(mass, PLACE_HOLDER_MOMENT));
shape = cpSpaceAddShapeAND_SET_MOMENT(space, cpPolyShapeNew(body, NUM_VERTS, verts, cpvzero));

So cpSpaceAddShapeAND_SET_MOMENT will do the convex hull, find the moment, and replace it on body.

If you want a custom moment, you need to calculate it on your own.. so really this is just a convenience method like idea 1.