97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
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#include <osg/PointSprite>
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#include <osg/BlendFunc>
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#include <osg/StateAttribute>
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#include <osg/Point>
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#include <osg/Geometry>
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#include <osg/Texture2D>
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#include <osg/TexEnv>
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#include <osgDB/ReadFile>
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#include <osgProducer/Viewer>
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#include <osg/GLExtensions>
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#include <osg/TexEnv>
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osg::Geode *makeGalaxy(unsigned nvertices)
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{
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osg::Geode *geode = new osg::Geode();
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osg::Geometry *galaxy = new osg::Geometry();
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osg::Vec3Array *vertices = new osg::Vec3Array();
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osg::Vec4Array *colors = new osg::Vec4Array();
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osg::Vec4 ini(1,1,0,1);
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osg::Vec4 fin(0,0,1,1);
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/** Formula for the two spirals */
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for (unsigned i=0;i<nvertices/2;i++) {
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float val = (i*2/(float)nvertices * 2 * 3.14159265359);
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float modx1 = rand() / (float)RAND_MAX*2;
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float mody1 = rand() / (float)RAND_MAX*2;
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float modx2 = rand() / (float)RAND_MAX*2;
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float mody2 = rand() / (float)RAND_MAX*2;
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float modz1 = ((rand()-RAND_MAX/2) / (float)(RAND_MAX))*3/(val+1);
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float modz2 = ((rand()-RAND_MAX/2) / (float)(RAND_MAX))*3/(val+1);
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vertices->push_back(osg::Vec3(cos(val)*val+modx1, sin(val)*val+mody1, modz1));
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vertices->push_back(osg::Vec3(-cos(val)*val+modx2, -sin(val)*val+mody2, modz2));
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colors->push_back(ini+(fin-ini)*(i*2/(float)nvertices));
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colors->push_back(ini+(fin-ini)*(i*2/(float)nvertices));
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}
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galaxy->setVertexArray(vertices);
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galaxy->setColorArray(colors);
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galaxy->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
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galaxy->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, nvertices));
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geode->addDrawable(galaxy);
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return geode;
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}
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osg::StateSet* makeStateSet(float size)
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{
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osg::StateSet *set = new osg::StateSet();
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/// Setup cool blending
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set->setMode(GL_BLEND, osg::StateAttribute::ON);
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osg::BlendFunc *fn = new osg::BlendFunc();
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fn->setFunction(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::DST_ALPHA);
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set->setAttributeAndModes(fn, osg::StateAttribute::ON);
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/// Setup the point sprites
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osg::PointSprite *sprite = new osg::PointSprite();
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set->setTextureAttributeAndModes(0, sprite, osg::StateAttribute::ON);
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/// Give some size to the points to be able to see the sprite
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osg::Point *point = new osg::Point();
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point->setSize(size);
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set->setAttributeAndModes(point, osg::StateAttribute::ON);
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/// Disable depth test to avoid sort problems and Lighting
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set->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF);
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set->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
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/// The texture for the sprites
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osg::Texture2D *tex = new osg::Texture2D();
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tex->setImage(osgDB::readImageFile("Images/particle.rgb"));
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set->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON);
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return set;
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}
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int main(int, char *[])
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{
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osgProducer::Viewer viewer;
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/// Make the galaxy of points
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osg::Node *node = makeGalaxy(5000);
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node->setStateSet(makeStateSet(10.0f));
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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viewer.setSceneData(node);
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viewer.realize();
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while (!viewer.done())
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{
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viewer.sync();
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viewer.update();
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viewer.frame();
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}
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}
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