1 // a layer of 3d clouds
3 // Written by Harald JOHNSEN, started April 2005.
5 // Copyright (C) 2005 Harald JOHNSEN - hjohnsen@evc.net
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
23 #ifndef _CLOUDFIELD_HXX
24 #define _CLOUDFIELD_HXX
26 #include <simgear/compiler.h>
29 #include <osgDB/ReaderWriter>
31 #include <osg/ref_ptr>
33 #include <osg/Geometry>
44 #include <simgear/misc/sg_path.hxx>
45 #include <simgear/structure/Singleton.hxx>
46 #include <simgear/math/SGMath.hxx>
58 * A layer of 3D clouds.
72 // We create a quadtree two levels deep
73 static const int BRANCH_SIZE = 16;
74 static const int QUADTREE_SIZE = 32;
76 // this is a relative position only, with that we can move all clouds at once
77 SGVec3f relative_position;
80 osg::ref_ptr<osg::Group> field_root;
81 osg::ref_ptr<osg::MatrixTransform> field_transform;
82 osg::ref_ptr<osg::PositionAttitudeTransform> altitude_transform;
83 osg::ref_ptr<osg::Switch> field_group[QUADTREE_SIZE][QUADTREE_SIZE];
84 osg::ref_ptr<osg::LOD> quad[BRANCH_SIZE][BRANCH_SIZE];
86 osg::ref_ptr<osg::LOD> field_lod;
88 double deltax, deltay, alt;
94 struct CloudFog : public simgear::Singleton<CloudFog>
97 osg::ref_ptr<osg::Fog> fog;
106 // add one cloud, data is not copied, ownership given
107 void addCloud( SGVec3f& pos, osg::ref_ptr<simgear::EffectGeode> cloud);
110 * reposition the cloud layer at the specified origin and
112 * @param p position vector
113 * @param up the local up vector
114 * @param lon specifies a rotation about the Z axis
115 * @param lat specifies a rotation about the new Y axis
116 * @param dt the time elapsed since the last call
117 * @param asl altitude of the layer
119 bool reposition( const SGVec3f& p, const SGVec3f& up,
120 double lon, double lat, double dt, int asl);
122 osg::Group* getNode() { return field_root.get(); }
124 // visibility distance for clouds in meters
125 static float CloudVis;
127 static SGVec3f view_vec, view_X, view_Y;
129 static float view_distance;
130 static double timer_dt;
131 static float fieldSize;
135 float getCoverage(void) { return coverage; }
136 void setCoverage(float c) { coverage = c; }
138 static float getVisRange(void) { return view_distance; }
139 static void setVisRange(float d) { view_distance = d; }
141 void applyCoverage(void);
142 void applyVisRange(void);
144 static osg::Fog* getFog()
146 return CloudFog::instance()->fog.get();
148 static void updateFog(double visibility, const osg::Vec4f& color);
151 #endif // _CLOUDFIELD_HXX