408 lines
13 KiB
C++
408 lines
13 KiB
C++
#include <osgProducer/Viewer>
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#include <osg/Group>
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#include <osg/Geode>
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#include <osg/ShapeDrawable>
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#include <osg/Texture2D>
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#include <osg/PositionAttitudeTransform>
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#include <osg/MatrixTransform>
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#include <osg/Geometry>
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#include <osgDB/ReadFile>
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#include <osgText/Text>
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#include <osgSim/SphereSegment>
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#include <osgSim/OverlayNode>
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#include <osgParticle/ExplosionEffect>
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#include <osgParticle/SmokeEffect>
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#include <osgParticle/FireEffect>
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#include <osgParticle/ParticleSystemUpdater>
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// for the grid data..
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#include "../osghangglide/terrain_coords.h"
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osg::AnimationPath* createAnimationPath(const osg::Vec3& center,float radius,double looptime)
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{
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// set up the animation path
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osg::AnimationPath* animationPath = new osg::AnimationPath;
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animationPath->setLoopMode(osg::AnimationPath::LOOP);
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int numSamples = 40;
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float yaw = 0.0f;
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float yaw_delta = 2.0f*osg::PI/((float)numSamples-1.0f);
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float roll = osg::inDegrees(30.0f);
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double time=0.0f;
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double time_delta = looptime/(double)numSamples;
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for(int i=0;i<numSamples;++i)
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{
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osg::Vec3 position(center+osg::Vec3(sinf(yaw)*radius,cosf(yaw)*radius,0.0f));
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osg::Quat rotation(osg::Quat(roll,osg::Vec3(0.0,1.0,0.0))*osg::Quat(-(yaw+osg::inDegrees(90.0f)),osg::Vec3(0.0,0.0,1.0)));
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animationPath->insert(time,osg::AnimationPath::ControlPoint(position,rotation));
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yaw += yaw_delta;
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time += time_delta;
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}
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return animationPath;
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}
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osg::Node* createMovingModel(const osg::Vec3& center, float radius)
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{
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float animationLength = 10.0f;
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osg::AnimationPath* animationPath = createAnimationPath(center,radius,animationLength);
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osg::Group* model = new osg::Group;
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osg::Node* glider = osgDB::readNodeFile("glider.osg");
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if (glider)
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{
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const osg::BoundingSphere& bs = glider->getBound();
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float size = radius/bs.radius()*0.3f;
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osg::MatrixTransform* positioned = new osg::MatrixTransform;
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positioned->setDataVariance(osg::Object::STATIC);
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positioned->setMatrix(osg::Matrix::translate(-bs.center())*
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osg::Matrix::scale(size,size,size)*
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osg::Matrix::rotate(osg::inDegrees(-90.0f),0.0f,0.0f,1.0f));
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positioned->addChild(glider);
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osg::PositionAttitudeTransform* xform = new osg::PositionAttitudeTransform;
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xform->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
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xform->setUpdateCallback(new osg::AnimationPathCallback(animationPath,0.0,1.0));
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xform->addChild(positioned);
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model->addChild(xform);
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}
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osg::Node* cessna = osgDB::readNodeFile("cessna.osg");
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if (cessna)
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{
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const osg::BoundingSphere& bs = cessna->getBound();
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osgText::Text* text = new osgText::Text;
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float size = radius/bs.radius()*0.3f;
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text->setPosition(bs.center());
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text->setText("Cessna");
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text->setAlignment(osgText::Text::CENTER_CENTER);
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text->setAxisAlignment(osgText::Text::SCREEN);
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text->setCharacterSize(40.0f);
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text->setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(text);
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osg::LOD* lod = new osg::LOD;
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lod->setRangeMode(osg::LOD::PIXEL_SIZE_ON_SCREEN);
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lod->addChild(geode,0.0f,100.0f);
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lod->addChild(cessna,100.0f,10000.0f);
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osg::MatrixTransform* positioned = new osg::MatrixTransform;
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positioned->getOrCreateStateSet()->setMode(GL_NORMALIZE, osg::StateAttribute::ON);
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positioned->setDataVariance(osg::Object::STATIC);
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positioned->setMatrix(osg::Matrix::translate(-bs.center())*
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osg::Matrix::scale(size,size,size)*
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osg::Matrix::rotate(osg::inDegrees(180.0f),0.0f,0.0f,1.0f));
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//positioned->addChild(cessna);
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positioned->addChild(lod);
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osg::MatrixTransform* xform = new osg::MatrixTransform;
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xform->setUpdateCallback(new osg::AnimationPathCallback(animationPath,0.0f,2.0));
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xform->addChild(positioned);
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// add particle effects to cessna.
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{
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osg::PositionAttitudeTransform* positionEffects = new osg::PositionAttitudeTransform;
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positionEffects->setPosition(osg::Vec3(0.0f,0.0f,0.0f));
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xform->addChild(positionEffects);
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osgParticle::ExplosionEffect* explosion = new osgParticle::ExplosionEffect;
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osgParticle::SmokeEffect* smoke = new osgParticle::SmokeEffect;
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osgParticle::FireEffect* fire = new osgParticle::FireEffect;
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positionEffects->addChild(explosion);
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positionEffects->addChild(smoke);
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positionEffects->addChild(fire);
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}
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model->addChild(xform);
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}
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return model;
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}
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osg::Group* createOverlay(const osg::Vec3& center, float radius)
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{
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osg::Group* group = new osg::Group;
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// create a grid of lines.
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{
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osg::Geometry* geom = new osg::Geometry;
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unsigned int num_rows = 10;
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osg::Vec3 left = center+osg::Vec3(-radius,-radius,0.0f);
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osg::Vec3 right = center+osg::Vec3(radius,-radius,0.0f);
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osg::Vec3 delta_row = osg::Vec3(0.0f,2.0f*radius/float(num_rows-1),0.0f);
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osg::Vec3 top = center+osg::Vec3(-radius,radius,0.0f);
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osg::Vec3 bottom = center+osg::Vec3(-radius,-radius,0.0f);
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osg::Vec3 delta_column = osg::Vec3(2.0f*radius/float(num_rows-1),0.0f,0.0f);
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osg::Vec3Array* vertices = new osg::Vec3Array;
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for(unsigned int i=0; i<num_rows; ++i)
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{
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vertices->push_back(left);
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vertices->push_back(right);
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left += delta_row;
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right += delta_row;
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vertices->push_back(top);
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vertices->push_back(bottom);
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top += delta_column;
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bottom += delta_column;
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}
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geom->setVertexArray(vertices);
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geom->addPrimitiveSet(new osg::DrawArrays(GL_LINES,0,vertices->getNumElements()));
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(geom);
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group->addChild(geode);
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}
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return group;
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}
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osg::Vec3 computeTerrainIntersection(osg::Node* subgraph,float x,float y)
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{
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osgUtil::IntersectVisitor iv;
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osg::ref_ptr<osg::LineSegment> segDown = new osg::LineSegment;
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const osg::BoundingSphere& bs = subgraph->getBound();
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float zMax = bs.center().z()+bs.radius();
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float zMin = bs.center().z()-bs.radius();
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segDown->set(osg::Vec3(x,y,zMin),osg::Vec3(x,y,zMax));
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iv.addLineSegment(segDown.get());
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subgraph->accept(iv);
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if (iv.hits())
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{
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osgUtil::IntersectVisitor::HitList& hitList = iv.getHitList(segDown.get());
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if (!hitList.empty())
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{
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osg::Vec3 ip = hitList.front().getWorldIntersectPoint();
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return ip;
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}
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}
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return osg::Vec3(x,y,0.0f);
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}
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//////////////////////////////////////////////////////////////////////////////
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// MAIN SCENE GRAPH BUILDING FUNCTION
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//////////////////////////////////////////////////////////////////////////////
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void build_world(osg::Group *root)
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{
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// create terrain
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osg::ref_ptr<osg::Geode> terrainGeode = 0;
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{
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terrainGeode = new osg::Geode;
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osg::StateSet* stateset = new osg::StateSet();
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osg::Image* image = osgDB::readImageFile("Images/lz.rgb");
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if (image)
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{
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osg::Texture2D* texture = new osg::Texture2D;
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texture->setImage(image);
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stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
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}
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terrainGeode->setStateSet( stateset );
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float size = 1000; // 10km;
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float scale = size/39.0f; // 10km;
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float z_scale = scale*3.0f;
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osg::HeightField* grid = new osg::HeightField;
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grid->allocate(38,39);
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grid->setXInterval(scale);
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grid->setYInterval(scale);
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for(unsigned int r=0;r<39;++r)
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{
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for(unsigned int c=0;c<38;++c)
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{
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grid->setHeight(c,r,z_scale*vertex[r+c*39][2]);
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}
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}
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terrainGeode->addDrawable(new osg::ShapeDrawable(grid));
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}
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// create sphere segment
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osg::ref_ptr<osgSim::SphereSegment> ss = 0;
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{
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ss = new osgSim::SphereSegment(
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computeTerrainIntersection(terrainGeode.get(),550.0f,780.0f), // center
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500.0f, // radius
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osg::DegreesToRadians(135.0f),
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osg::DegreesToRadians(245.0f),
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osg::DegreesToRadians(-10.0f),
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osg::DegreesToRadians(30.0f),
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60);
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ss->setAllColors(osg::Vec4(1.0f,1.0f,1.0f,0.5f));
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ss->setSideColor(osg::Vec4(0.0f,1.0f,1.0f,0.1f));
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root->addChild(ss.get());
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}
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osgSim::SphereSegment::LineList lines = ss->computeIntersection(terrainGeode.get(), osg::Matrixd::identity());
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if (!lines.empty())
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{
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osg::notify(osg::NOTICE)<<"We've found intersections!!!!"<<std::endl;
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}
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else
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{
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osg::notify(osg::NOTICE)<<"No intersections found"<<std::endl;
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}
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#if 1
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osgSim::OverlayNode* overlayNode = new osgSim::OverlayNode;
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const osg::BoundingSphere& bs = terrainGeode->getBound();
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osg::Group* overlaySubgraph = createOverlay(bs.center(), bs.radius()*0.5f);
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overlaySubgraph->addChild(ss.get());
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overlayNode->setOverlaySubgraph(overlaySubgraph);
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overlayNode->setOverlayTextureSizeHint(2048);
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overlayNode->addChild(terrainGeode.get());
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root->addChild(overlayNode);
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#else
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root->addChild(terrainGeode);
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#endif
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// create particle effects
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{
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osg::Vec3 position = computeTerrainIntersection(terrainGeode.get(),100.0f,100.0f);
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osgParticle::ExplosionEffect* explosion = new osgParticle::ExplosionEffect(position, 10.0f);
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osgParticle::SmokeEffect* smoke = new osgParticle::SmokeEffect(position, 10.0f);
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osgParticle::FireEffect* fire = new osgParticle::FireEffect(position, 10.0f);
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root->addChild(explosion);
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root->addChild(smoke);
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root->addChild(fire);
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}
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// create particle effects
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{
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osg::Vec3 position = computeTerrainIntersection(terrainGeode.get(),200.0f,100.0f);
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osgParticle::ExplosionEffect* explosion = new osgParticle::ExplosionEffect(position, 1.0f);
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osgParticle::SmokeEffect* smoke = new osgParticle::SmokeEffect(position, 1.0f);
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osgParticle::FireEffect* fire = new osgParticle::FireEffect(position, 1.0f);
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root->addChild(explosion);
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root->addChild(smoke);
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root->addChild(fire);
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}
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// create the moving models.
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{
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root->addChild(createMovingModel(osg::Vec3(500.0f,500.0f,500.0f),100.0f));
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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// main()
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//////////////////////////////////////////////////////////////////////////////
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int main(int argc, char **argv)
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// set up the usage document, in case we need to print out how to use this program.
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates use of particle systems.");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] image_file_left_eye image_file_right_eye");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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// construct the viewer.
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osgProducer::Viewer viewer(arguments);
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// set up the value with sensible default event handlers.
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viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
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// get details on keyboard and mouse bindings used by the viewer.
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viewer.getUsage(*arguments.getApplicationUsage());
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// if user request help write it out to cout.
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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// any option left unread are converted into errors to write out later.
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arguments.reportRemainingOptionsAsUnrecognized();
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// report any errors if they have occured when parsing the program aguments.
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if (arguments.errors())
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{
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arguments.writeErrorMessages(std::cout);
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return 1;
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}
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osg::Group *root = new osg::Group;
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build_world(root);
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// add a viewport to the viewer and attach the scene graph.
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viewer.setSceneData(root);
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// create the windows and run the threads.
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viewer.realize();
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while( !viewer.done() )
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{
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// wait for all cull and draw threads to complete.
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viewer.sync();
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// update the scene by traversing it with the the update visitor which will
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// call all node update callbacks and animations.
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viewer.update();
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// fire off the cull and draw traversals of the scene.
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viewer.frame();
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}
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// wait for all cull and draw threads to complete before exit.
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viewer.sync();
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return 0;
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}
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