用OSG实现的实时仿真的雷达波效果

#include "IndirectRadarEffect.h" #include <osg/Geode> #include <osg/Billboard> #include <osg/Geometry> #include <iostream> namespace RadarEffect { osg::ref_ptr<osg::Node> createTracingWave(float radius, float height, osg::Vec4& startColor, osg::Vec4& endColor) { osg::ref_ptr<osg::Geode> geode = new osg::Geode; osg::ref_ptr<osg::Geometry> geom = new osg::Geometry; osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array; osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array; osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array; geom->setVertexArray(vertices.get()); geom->setColorArray(colors.get()); geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX); geom->setNormalArray(normals.get()); geom->setNormalBinding(osg::Geometry::BIND_OVERALL); normals->push_back(osg::Vec3(0.0, -1.0, 0.0)); //下后面，保证定点是逆时针 vertices->push_back(osg::Vec3(radius, 0.0, -radius)); vertices->push_back(osg::Vec3(radius, height, -radius)); vertices->push_back(osg::Vec3(-radius, height, -radius)); vertices->push_back(osg::Vec3(-radius, 0.0, -radius)); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); colors->push_back(startColor); //下前面 vertices->push_back(osg::Vec3(radius, 0.0, -radius)); vertices->push_back(osg::Vec3(-radius, 0.0, -radius)); vertices->push_back(osg::Vec3(-radius, -height, -radius)); vertices->push_back(osg::Vec3(radius, -height, -radius)); colors->push_back(startColor); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); //左后面 vertices->push_back(osg::Vec3(-radius, 0.0, -radius)); vertices->push_back(osg::Vec3(-radius, height, -radius)); vertices->push_back(osg::Vec3(-radius, height, radius)); vertices->push_back(osg::Vec3(-radius, 0.0, radius)); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); colors->push_back(startColor); //左前面 vertices->push_back(osg::Vec3(-radius, 0.0, -radius)); vertices->push_back(osg::Vec3(-radius, 0.0, radius)); vertices->push_back(osg::Vec3(-radius, -height, radius)); vertices->push_back(osg::Vec3(-radius, -height, -radius)); colors->push_back(startColor); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); //上后面 vertices->push_back(osg::Vec3(-radius, 0.0, radius)); vertices->push_back(osg::Vec3(radius, 0.0, radius)); vertices->push_back(osg::Vec3(radius, height, radius)); vertices->push_back(osg::Vec3(-radius, height, radius)); colors->push_back(startColor); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); //上前面 vertices->push_back(osg::Vec3(-radius, 0.0, radius)); vertices->push_back(osg::Vec3(-radius, -height, radius)); vertices->push_back(osg::Vec3(radius, -height, radius)); vertices->push_back(osg::Vec3(radius, 0.0, radius)); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); colors->push_back(startColor); //右后面 vertices->push_back(osg::Vec3(radius, 0.0, radius)); vertices->push_back(osg::Vec3(radius, 0.0, -radius)); vertices->push_back(osg::Vec3(radius, height, -radius)); vertices->push_back(osg::Vec3(radius, height, radius)); colors->push_back(startColor); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); //右前面 vertices->push_back(osg::Vec3(radius, 0.0, radius)); vertices->push_back(osg::Vec3(radius, -height, radius)); vertices->push_back(osg::Vec3(radius, -height, -radius)); vertices->push_back(osg::Vec3(radius, 0.0, -radius)); colors->push_back(startColor); colors->push_back(endColor); colors->push_back(endColor); colors->push_back(startColor); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 4)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 4, 4)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 8, 4)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 12, 4)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 16, 4)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 20, 4)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 24, 4)); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 28, 4)); geode->addDrawable(geom.get()); geode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF); geode->getOrCreateStateSet()->setMode(GL_RESCALE_NORMAL, osg::StateAttribute::ON); //开启混合 geode->getOrCreateStateSet()->setMode(GL_BLEND, osg::StateAttribute::ON); return geode.release(); } //画正弦波 osg::ref_ptr<osg::Node> SincreateTracingWave(osg::Vec3 startPos,osg::Vec3 endPos, float radius, float height, osg::Vec4& startColor, osg::Vec4& endColor,int mul) { //osg::ref_ptr<osg::Billboard> geode = new osg::Billboard; osg::ref_ptr<osg::Geode>geode=new osg::Geode; osg::ref_ptr<osg::Geometry> geom = new osg::Geometry; osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array; osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array; osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array; geom->setVertexArray(vertices.get()); geom->setColorArray(colors.get()); geom->setColorBinding(osg::Geometry::BIND_OVERALL); geom->setNormalArray(normals.get()); geom->setNormalBinding(osg::Geometry::BIND_OVERALL); normals->push_back(osg::Vec3(0.0, -1.0, 0.0)); //加入正弦波的所有顶点 double number=200;//一个周期内的采点数，数越大正弦波越精细 double stepX=osg::PI*2/number;//x采点的步长 double x=0; vertices->push_back(osg::Vec3(x, 0.0,0.0));//加入起始点（0.0,0.0,0.0） osg::Vec3 temp=endPos-startPos; double distance=temp.length();//求出两点之间的距离 int r=mul*ceil(distance/(osg::PI*2));//算出所需的周期数,此处乘以10是为了增加单位长度内波形数，最后要缩放10倍，以保持两点间距离不变 for(int i=0;i<number*r;i++) { x+=stepX; vertices->push_back(osg::Vec3(x, 0.0,sin(x)*height)); } vertices->push_back(osg::Vec3(osg::PI*2*r, 0.0,0.0)); colors->push_back(startColor); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP, 0,vertices->size())); osg::ref_ptr<osg::LineWidth> linwidth=new osg::LineWidth; linwidth->setWidth(radius); geom->getOrCreateStateSet()->setAssociatedModes(linwidth.get(),osg::StateAttribute::ON); geode->addDrawable(geom.get()); geode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF); geode->getOrCreateStateSet()->setMode(GL_RESCALE_NORMAL, osg::StateAttribute::ON); //开启混合 geode->getOrCreateStateSet()->setMode(GL_BLEND, osg::StateAttribute::ON); //geode->setMode(osg::Billboard::POINT_ROT_EYE); //geode->setMode(osg::Billboard::AXIAL_ROT); //temp.normalize(); //geode->setAxis(temp); return geode.release(); } ///单个跟踪波束回调类 ///主要实现思想是：在step个回合内，波束到达终点，然后每次都去计算当前点与终点之间剩余的step数 ///然后去得出本次需要前进的距离数 tracingWaveCallback::tracingWaveCallback() { } tracingWaveCallback::tracingWaveCallback(int waveID, osg::Vec3& beginPos, osg::Vec3& endPos, int step, float radius, float height, osg::Vec4& startColor, osg::Vec4& endColor,int kind): _beginPos(beginPos), _endPos(endPos), _currentPos(beginPos), _step(step), _sizeStep(1.0 / step), _currentStep(step), _radius(radius), _height(height), _startColor(startColor), _endColor(endColor), _firstAddWave(true), _removeOnce(true), _kind(kind), _waveID(waveID), _currentCount(0) { if(kind==1)_currentSize=0.0;//由小到大的雷达波 if(kind==2)_currentSize=1.0;//由大到小的雷达波 if(kind==3)_current