public void colorNoChildren(float r, float g, float b) {
colorNoChildren(r, g, b, 1);
}
public void colorNoChildren(Vector4f color) {
colorNoChildren(color.x, color.y, color.z, color.w);
}
public void color(float r, float g, float b, float a) {
colorNoChildren(r, g, b, a);
for (GameObject child : children) child.color(r, g, b, a);
}