public void addQuad(int vertexA, int vertexB, int vertexC, int vertexD) {
haveQuads = true;
addPolygon(new int[] {vertexA, vertexB, vertexC, vertexD}, null);
}
public void addTriangle(int vertexA, int vertexB, int vertexC) {
addPolygon(new int[] {vertexA, vertexB, vertexC}, null);
}