1 | |
---|
2 | |
---|
3 | |
---|
4 | |
---|
5 | |
---|
6 | |
---|
7 | |
---|
8 | |
---|
9 | |
---|
10 | |
---|
11 | |
---|
12 | |
---|
13 | #include <stdio.h> |
---|
14 | #include <math.h> |
---|
15 | |
---|
16 | #include <osg/Billboard> |
---|
17 | |
---|
18 | using namespace osg; |
---|
19 | |
---|
20 | #define square(x) ((x)*(x)) |
---|
21 | |
---|
22 | Billboard::Billboard() |
---|
23 | { |
---|
24 | _mode = AXIAL_ROT; |
---|
25 | _axis.set(0.0f,0.0f,1.0f); |
---|
26 | |
---|
27 | setNormal(Vec3(0.0f,-1.0f,0.0f)); |
---|
28 | updateCache(); |
---|
29 | } |
---|
30 | |
---|
31 | Billboard::Billboard(const Billboard& billboard,const CopyOp& copyop): |
---|
32 | Geode(billboard,copyop), |
---|
33 | _mode(billboard._mode), |
---|
34 | _axis(billboard._axis), |
---|
35 | _normal(billboard._normal), |
---|
36 | _positionList(billboard._positionList), |
---|
37 | _cachedMode(billboard._cachedMode), |
---|
38 | _side(billboard._side) |
---|
39 | { |
---|
40 | setNormal(_normal); |
---|
41 | } |
---|
42 | |
---|
43 | Billboard::~Billboard() |
---|
44 | { |
---|
45 | } |
---|
46 | |
---|
47 | void Billboard::setMode(Mode mode) |
---|
48 | { |
---|
49 | _mode = mode; |
---|
50 | _cachedMode = CACHE_DIRTY; |
---|
51 | updateCache(); |
---|
52 | } |
---|
53 | |
---|
54 | void Billboard::setAxis(const Vec3& axis) |
---|
55 | { |
---|
56 | _axis = axis; |
---|
57 | _axis.normalize(); |
---|
58 | updateCache(); |
---|
59 | } |
---|
60 | |
---|
61 | void Billboard::setNormal(const Vec3& normal) |
---|
62 | { |
---|
63 | _normal = normal; |
---|
64 | _normal.normalize(); |
---|
65 | updateCache(); |
---|
66 | |
---|
67 | |
---|
68 | |
---|
69 | Vec3 z(0.0, 0.0, 1.0); |
---|
70 | Vec3 cp(z^_normal); |
---|
71 | float dot = z*_normal; |
---|
72 | float cp_len = cp.length(); |
---|
73 | if (cp_len != 0.0f) |
---|
74 | { |
---|
75 | cp /= cp_len; |
---|
76 | float rotation_cp = acosf(dot); |
---|
77 | Matrix rotateNormalToZ; |
---|
78 | _rotateNormalToZAxis.makeRotate(-rotation_cp, cp); |
---|
79 | } |
---|
80 | else |
---|
81 | _rotateNormalToZAxis.makeIdentity(); |
---|
82 | } |
---|
83 | |
---|
84 | void Billboard::updateCache() |
---|
85 | { |
---|
86 | if (_mode==AXIAL_ROT) |
---|
87 | { |
---|
88 | if (_axis==Vec3(1.0f,0.0,0.0f) && _normal==Vec3(0.0f,-1.0,0.0f)) _cachedMode = AXIAL_ROT_X_AXIS; |
---|
89 | else if (_axis==Vec3(0.0f,1.0,0.0f) && _normal==Vec3(1.0f, 0.0,0.0f)) _cachedMode = AXIAL_ROT_Y_AXIS; |
---|
90 | else if (_axis==Vec3(0.0f,0.0,1.0f) && _normal==Vec3(0.0f,-1.0,0.0f)) _cachedMode = AXIAL_ROT_Z_AXIS; |
---|
91 | else _cachedMode = AXIAL_ROT; |
---|
92 | } |
---|
93 | else if( _mode == POINT_ROT_WORLD ) |
---|
94 | { |
---|
95 | if(_axis==Vec3(0.0f, 0.0, 1.0f) && _normal==Vec3(0.0f, -1.0f, 0.0f)) _cachedMode = POINT_ROT_WORLD_Z_AXIS; |
---|
96 | else _cachedMode = _mode; |
---|
97 | |
---|
98 | } |
---|
99 | else _cachedMode = _mode; |
---|
100 | |
---|
101 | _side = _axis^_normal; |
---|
102 | _side.normalize(); |
---|
103 | } |
---|
104 | |
---|
105 | bool Billboard::addDrawable(Drawable *gset) |
---|
106 | { |
---|
107 | if (Geode::addDrawable(gset)) |
---|
108 | { |
---|
109 | Vec3 pos(0.0f,0.0f,0.0f); |
---|
110 | while (_positionList.size()<_drawables.size()) |
---|
111 | { |
---|
112 | _positionList.push_back(pos); |
---|
113 | } |
---|
114 | return true; |
---|
115 | } |
---|
116 | return false; |
---|
117 | } |
---|
118 | |
---|
119 | |
---|
120 | bool Billboard::addDrawable(Drawable *gset,const Vec3& pos) |
---|
121 | { |
---|
122 | if (Geode::addDrawable(gset)) |
---|
123 | { |
---|
124 | while (_positionList.size()<_drawables.size()) |
---|
125 | { |
---|
126 | _positionList.push_back(pos); |
---|
127 | } |
---|
128 | return true; |
---|
129 | } |
---|
130 | return false; |
---|
131 | } |
---|
132 | |
---|
133 | |
---|
134 | bool Billboard::removeDrawable( Drawable *gset ) |
---|
135 | { |
---|
136 | PositionList::iterator pitr = _positionList.begin(); |
---|
137 | for (DrawableList::iterator itr=_drawables.begin(); |
---|
138 | itr!=_drawables.end(); |
---|
139 | ++itr,++pitr) |
---|
140 | { |
---|
141 | if (itr->get()==gset) |
---|
142 | { |
---|
143 | |
---|
144 | _drawables.erase(itr); |
---|
145 | _positionList.erase(pitr); |
---|
146 | dirtyBound(); |
---|
147 | return true; |
---|
148 | } |
---|
149 | } |
---|
150 | return false; |
---|
151 | } |
---|
152 | |
---|
153 | bool Billboard::computeMatrix(Matrix& modelview, const Vec3& eye_local, const Vec3& pos_local) const |
---|
154 | { |
---|
155 | |
---|
156 | |
---|
157 | Matrix matrix; |
---|
158 | |
---|
159 | Vec3 ev(eye_local-pos_local); |
---|
160 | switch(_cachedMode) |
---|
161 | { |
---|
162 | case(AXIAL_ROT_Z_AXIS): |
---|
163 | { |
---|
164 | |
---|
165 | ev.z() = 0.0f; |
---|
166 | float ev_length = ev.length(); |
---|
167 | if (ev_length>0.0f) |
---|
168 | { |
---|
169 | |
---|
170 | |
---|
171 | float inv = 1.0f/ev_length; |
---|
172 | float s = ev.x()*inv; |
---|
173 | float c = -ev.y()*inv; |
---|
174 | matrix(0,0) = c; |
---|
175 | matrix(1,0) = -s; |
---|
176 | matrix(0,1) = s; |
---|
177 | matrix(1,1) = c; |
---|
178 | } |
---|
179 | break; |
---|
180 | } |
---|
181 | case(AXIAL_ROT_Y_AXIS): |
---|
182 | { |
---|
183 | ev.y() = 0.0f; |
---|
184 | float ev_length = ev.length(); |
---|
185 | if (ev_length>0.0f) |
---|
186 | { |
---|
187 | |
---|
188 | |
---|
189 | float inv = 1.0f/ev_length; |
---|
190 | float s = -ev.z()*inv; |
---|
191 | float c = ev.x()*inv; |
---|
192 | matrix(0,0) = c; |
---|
193 | matrix(2,0) = s; |
---|
194 | matrix(0,2) = -s; |
---|
195 | matrix(2,2) = c; |
---|
196 | } |
---|
197 | break; |
---|
198 | } |
---|
199 | case(AXIAL_ROT_X_AXIS): |
---|
200 | { |
---|
201 | ev.x() = 0.0f; |
---|
202 | float ev_length = ev.length(); |
---|
203 | if (ev_length>0.0f) |
---|
204 | { |
---|
205 | |
---|
206 | |
---|
207 | |
---|
208 | float inv = 1.0f/ev_length; |
---|
209 | float s = -ev.z()*inv; |
---|
210 | float c = -ev.y()*inv; |
---|
211 | matrix(1,1) = c; |
---|
212 | matrix(2,1) = -s; |
---|
213 | matrix(1,2) = s; |
---|
214 | matrix(2,2) = c; |
---|
215 | } |
---|
216 | break; |
---|
217 | } |
---|
218 | case(AXIAL_ROT): |
---|
219 | { |
---|
220 | float ev_side = ev*_side; |
---|
221 | float ev_normal = ev*_normal; |
---|
222 | float rotation = atan2f(ev_side,ev_normal); |
---|
223 | matrix.makeRotate(rotation,_axis); |
---|
224 | break; |
---|
225 | } |
---|
226 | case(POINT_ROT_WORLD): |
---|
227 | { |
---|
228 | float ev_len = ev.length(); |
---|
229 | if (ev_len != 0.0f) |
---|
230 | { |
---|
231 | ev /= ev_len; |
---|
232 | |
---|
233 | Vec3 cp(ev^_normal); |
---|
234 | float dot = ev*_normal; |
---|
235 | |
---|
236 | float cp_len = cp.length(); |
---|
237 | if (cp_len != 0.0f) |
---|
238 | { |
---|
239 | cp /= cp_len; |
---|
240 | |
---|
241 | float rotation_cp = acosf(dot); |
---|
242 | matrix.makeRotate(-inRadians(rotation_cp),cp[0],cp[1],cp[2]); |
---|
243 | } |
---|
244 | } |
---|
245 | break; |
---|
246 | } |
---|
247 | case(POINT_ROT_EYE): |
---|
248 | { |
---|
249 | float ev_len = ev.length(); |
---|
250 | if (ev_len != 0.0f) |
---|
251 | { |
---|
252 | ev /= ev_len; |
---|
253 | |
---|
254 | Vec3 up(modelview(0,1), modelview(1,1), modelview(2,1)); |
---|
255 | Vec3 right(up^ev); |
---|
256 | right.normalize(); |
---|
257 | up = ev^right; |
---|
258 | up.normalize(); |
---|
259 | |
---|
260 | matrix(0,0) = right.x(); |
---|
261 | matrix(0,1) = right.y(); |
---|
262 | matrix(0,2) = right.z(); |
---|
263 | matrix(1,0) = up.x(); |
---|
264 | matrix(1,1) = up.y(); |
---|
265 | matrix(1,2) = up.z(); |
---|
266 | matrix(2,0) = ev.x(); |
---|
267 | matrix(2,1) = ev.y(); |
---|
268 | matrix(2,2) = ev.z(); |
---|
269 | |
---|
270 | matrix.preMult(_rotateNormalToZAxis); |
---|
271 | } |
---|
272 | break; |
---|
273 | } |
---|
274 | case(POINT_ROT_WORLD_Z_AXIS): |
---|
275 | { |
---|
276 | |
---|
277 | |
---|
278 | |
---|
279 | |
---|
280 | Vec2 about_z( -ev.y(), ev.x() ); |
---|
281 | if( about_z.normalize() == 0.0f ) about_z.x() = 1.0f; |
---|
282 | float xy_distance = sqrt( ev.x()*ev.x() + ev.y()*ev.y() ); |
---|
283 | Vec2 from_xy( xy_distance, -ev.z() ); |
---|
284 | if( from_xy.normalize() == 0.0f ) from_xy.x() = 1.0f; |
---|
285 | |
---|
286 | matrix(0,0) = about_z.x(); |
---|
287 | matrix(0,1) = about_z.y(); |
---|
288 | matrix(1,0) = -about_z.y()*from_xy.x(); |
---|
289 | matrix(1,1) = about_z.x()*from_xy.x(); |
---|
290 | matrix(1,2) = from_xy.y(); |
---|
291 | matrix(2,0) = about_z.y()*from_xy.y(); |
---|
292 | matrix(2,1) = -about_z.x()*from_xy.y(); |
---|
293 | matrix(2,2) = from_xy.x(); |
---|
294 | |
---|
295 | break; |
---|
296 | } |
---|
297 | } |
---|
298 | |
---|
299 | matrix.setTrans(pos_local); |
---|
300 | |
---|
301 | modelview.preMult(matrix); |
---|
302 | |
---|
303 | return true; |
---|
304 | |
---|
305 | } |
---|
306 | |
---|
307 | BoundingSphere Billboard::computeBound() const |
---|
308 | { |
---|
309 | int i; |
---|
310 | int ngsets = _drawables.size(); |
---|
311 | |
---|
312 | if( ngsets == 0 ) return BoundingSphere(); |
---|
313 | |
---|
314 | BoundingSphere bsphere; |
---|
315 | bsphere._center.set(0.0f,0.0f,0.0f); |
---|
316 | |
---|
317 | for( i = 0; i < ngsets; i++ ) |
---|
318 | { |
---|
319 | const Drawable *gset = _drawables[i].get(); |
---|
320 | const BoundingBox& bbox = gset->getBound(); |
---|
321 | |
---|
322 | bsphere._center += bbox.center(); |
---|
323 | bsphere._center += _positionList[i]; |
---|
324 | } |
---|
325 | |
---|
326 | bsphere._center /= (float)(ngsets); |
---|
327 | |
---|
328 | float maxd = 0.0; |
---|
329 | for( i = 0; i < ngsets; ++i ) |
---|
330 | { |
---|
331 | const Drawable *gset = _drawables[i].get(); |
---|
332 | const BoundingBox& bbox = gset->getBound(); |
---|
333 | Vec3 local_center = bsphere._center-_positionList[i]; |
---|
334 | for(unsigned int c=0;c<8;++c) |
---|
335 | { |
---|
336 | float d = (bbox.corner(c)-local_center).length2(); |
---|
337 | if( d > maxd ) maxd = d; |
---|
338 | } |
---|
339 | } |
---|
340 | bsphere._radius = sqrtf(maxd); |
---|
341 | |
---|
342 | return bsphere; |
---|
343 | } |
---|