Sphere calculation

    private void create(TexturedModel model) {
        Vector3f center = Vector3f.add(model.getMax(), model.getMin(), null);
        center = new Vector3f(center.x / 2,center.y / 2,center.z / 2);

        this.center = center;
        Vector3f[] vertices = model.getVertices();
        float length = Float.MIN_VALUE;
        for(int i = 0; i < vertices.length;i++) {


            for(int j = 1; j < vertices.length;j++) {
                Vector3f v0 = vertices[i];
                Vector3f v1 = vertices[j];

                float tmp = Vector3f.dot(v0, v1);

                if(tmp < length) {
                    length = tmp;
                }
            }
        }

        this.radius = length;
    }