func getVertices(s string, m r3.Matrix) (vertices []Point) {
line := makePolyline(s)
for _, v := range line.vertices {
vertices = append(vertices, Point{m.MulVector(v.Vector).Normalize()})
}
return
}
func PointFromFrame(m r3.Matrix, q Point) Point {
return Point{m.MulVector(q.Vector)}
}