2 This file is part of the simulation module of 3dengfx.
4 Copyright (c) 2005 John Tsiombikas <nuclear@siggraph.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 /* Spring, not the season... the one with the -K
23 * Author: John Tsiombikas 2005
28 SpringConn::spring_conn(const Vector3 &pos, bool fixed) {
34 void SpringConn::set_fixed(bool fixed) {
38 bool SpringConn::is_fixed() const {
42 void SpringConn::set_weight(scalar_t weight) {
43 this->weight = weight;
46 scalar_t SpringConn::get_weight() const {
54 ends[0] = ends[1] = 0;
57 Spring::Spring(SpringConn *end1, SpringConn *end2, scalar_t k, scalar_t len) {
64 void Spring::set_ends(SpringConn *end1, SpringConn *end2) {
69 void Spring::set_stiffness(scalar_t stiffness) {
70 this->stiffness = stiffness;
73 void Spring::set_length(scalar_t len) {
77 Vector3 Spring::calc_force(int end) const {