2 Copyright (C) 2003, 2010 - Wolfire Games
3 Copyright (C) 2010-2016 - Lugaru contributors (see AUTHORS file)
5 This file is part of Lugaru.
7 Lugaru is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 Lugaru is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Lugaru. If not, see <http://www.gnu.org/licenses/>.
21 #include "Animation/Muscle.hpp"
23 #include "Utils/binio.h"
25 extern float multiplier;
38 rotate1 = 0, rotate2 = 0, rotate3 = 0;
39 lastrotate1 = 0, lastrotate2 = 0, lastrotate3 = 0;
40 oldrotate1 = 0, oldrotate2 = 0, oldrotate3 = 0;
41 newrotate1 = 0, newrotate2 = 0, newrotate3 = 0;
46 void Muscle::load(FILE* tfile, int vertexNum, std::vector<Joint>& joints)
48 int numvertices, vertice, parentID;
51 funpackf(tfile, "Bf Bf Bf Bf Bf Bi Bi", &length, &targetlength, &minlength, &maxlength, &strength, &type, &numvertices);
54 for (int j = 0; j < numvertices; j++) {
55 funpackf(tfile, "Bi", &vertice);
56 if (vertice < vertexNum) {
57 vertices.push_back(vertice);
62 funpackf(tfile, "Bb Bi", &visible, &parentID);
63 parent1 = &joints[parentID];
64 funpackf(tfile, "Bi", &parentID);
65 parent2 = &joints[parentID];
68 void Muscle::loadVerticesLow(FILE* tfile, int vertexNum)
70 int numvertices, vertice;
73 funpackf(tfile, "Bi", &numvertices);
76 for (int j = 0; j < numvertices; j++) {
77 funpackf(tfile, "Bi", &vertice);
78 if (vertice < vertexNum) {
79 verticeslow.push_back(vertice);
84 void Muscle::loadVerticesClothes(FILE* tfile, int vertexNum)
86 int numvertices, vertice;
89 funpackf(tfile, "Bi", &numvertices);
92 for (int j = 0; j < numvertices; j++) {
93 funpackf(tfile, "Bi", &vertice);
94 if (vertice < vertexNum) {
95 verticesclothes.push_back(vertice);
102 * sets strength, length,
103 * parent1->position, parent2->position,
104 * parent1->velocity, parent2->velocity
108 * Skeleton::DoConstraints
110 void Muscle::DoConstraint(bool spinny)
112 // FIXME: relaxlength shouldn't be static, but may not always be set
113 // so I don't want to change the existing behavior even though it's probably a bug
114 static float relaxlength;
116 float oldlength = length;
118 if (type != boneconnect) {
119 relaxlength = findDistance(&parent1->position, &parent2->position);
122 if (type == boneconnect) {
125 if (type == constraint) {
135 length -= (length - relaxlength) * (1 - strength) * multiplier * 10000;
136 length -= (length - targetlength) * (strength) * multiplier * 10000;
138 length = relaxlength;
140 if ((relaxlength - length > 0 && relaxlength - oldlength < 0) || (relaxlength - length < 0 && relaxlength - oldlength > 0))
141 length = relaxlength;
144 if (length < minlength)
146 if (length > maxlength)
149 if (length == relaxlength)
155 XYZ midp = (parent1->position * parent1->mass + parent2->position * parent2->mass) / (parent1->mass + parent2->mass);
157 //Find vector from midpoint to second vector
158 XYZ vel = parent2->position - midp;
160 //Change to unit vector
163 //Apply velocity change
164 XYZ newpoint1 = midp - vel * length * (parent2->mass / (parent1->mass + parent2->mass));
165 XYZ newpoint2 = midp + vel * length * (parent1->mass / (parent1->mass + parent2->mass));
166 if (!freeze && spinny) {
167 parent1->velocity = parent1->velocity + (newpoint1 - parent1->position) / multiplier / 4;
168 parent2->velocity = parent2->velocity + (newpoint2 - parent2->position) / multiplier / 4;
170 parent1->velocity = parent1->velocity + (newpoint1 - parent1->position);
171 parent2->velocity = parent2->velocity + (newpoint2 - parent2->position);
174 //Move child point to within certain distance of parent point
175 parent1->position = newpoint1;
176 parent2->position = newpoint2;