static void set_polygon_shape( const World& trans,
const float l, const float t, const float r, const float b,
b2PolygonShape& out) {
const b2Vec2 lt = trans.Ci2BoxTranslation(ci::Vec3f(l, t, 0.0f), nullptr); // using nullptr for the sprite will make the polygon be in world space
const b2Vec2 rb = trans.Ci2BoxTranslation(ci::Vec3f(r, b, 0.0f), nullptr);
b2Vec2 vtx[4];
vtx[0].Set(lt.x, lt.y);
vtx[1].Set(rb.x, lt.y);
vtx[2].Set(rb.x, rb.y);
vtx[3].Set(lt.x, rb.y);
out.Set(vtx, 4);
}
