osgjuguangdeng.rar_osg_osg 聚光灯_osg聚光灯

/* OpenSceneGraph example, osgspotlight. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include <osg/Notify> #include <osg/MatrixTransform> #include <osg/ShapeDrawable> #include <osg/PositionAttitudeTransform> #include <osg/Geometry> #include <osg/Texture2D> #include <osg/Geode> #include <osg/LightSource> #include <osg/TexGenNode> #include <osgUtil/Optimizer> #include <osgDB/Registry> #include <osgDB/ReadFile> #include <osgViewer/Viewer> // for the grid data.. #include "../osghangglide/terrain_coords.h" osg::Image* createSpotLightImage(const osg::Vec4& centerColour, const osg::Vec4& backgroudColour, unsigned int size, float power) { osg::Image* image = new osg::Image; image->allocateImage(size,size,1, GL_RGBA,GL_UNSIGNED_BYTE); float mid = (float(size)-1)*0.5f; float div = 2.0f/float(size); for(unsigned int r=0;r<size;++r) { unsigned char* ptr = image->data(0,r,0); for(unsigned int c=0;c<size;++c) { float dx = (float(c) - mid)*div; float dy = (float(r) - mid)*div; float r = powf(1.0f-sqrtf(dx*dx+dy*dy),power); if (r<0.0f) r=0.0f; osg::Vec4 color = centerColour*r+backgroudColour*(1.0f-r); *ptr++ = (unsigned char)((color[0])*255.0f); *ptr++ = (unsigned char)((color[1])*255.0f); *ptr++ = (unsigned char)((color[2])*255.0f); *ptr++ = (unsigned char)((color[3])*255.0f); } } return image; //return osgDB::readImageFile("spot.dds"); } osg::StateSet* createSpotLightDecoratorState(unsigned int lightNum, unsigned int textureUnit) { osg::StateSet* stateset = new osg::StateSet; stateset->setMode(GL_LIGHT0+lightNum, osg::StateAttribute::ON); osg::Vec4 centerColour(1.0f,1.0f,1.0f,1.0f); osg::Vec4 ambientColour(0.05f,0.05f,0.05f,1.0f); // set up spot light texture osg::Texture2D* texture = new osg::Texture2D(); texture->setImage(createSpotLightImage(centerColour, ambientColour, 64, 1.0)); texture->setBorderColor(osg::Vec4(ambientColour)); texture->setWrap(osg::Texture::WRAP_S,osg::Texture::CLAMP_TO_BORDER); texture->setWrap(osg::Texture::WRAP_T,osg::Texture::CLAMP_TO_BORDER); texture->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_BORDER); stateset->setTextureAttributeAndModes(textureUnit, texture, osg::StateAttribute::ON); // set up tex gens stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_S, osg::StateAttribute::ON); stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_T, osg::StateAttribute::ON); stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_R, osg::StateAttribute::ON); stateset->setTextureMode(textureUnit, GL_TEXTURE_GEN_Q, osg::StateAttribute::ON); return stateset; } osg::Node* createSpotLightNode(const osg::Vec3& position, const osg::Vec3& direction, float angle, unsigned int lightNum, unsigned int textureUnit) { osg::Group* group = new osg::Group; // create light source. osg::LightSource* lightsource = new osg::LightSource; osg::Light* light = lightsource->getLight(); light->setLightNum(lightNum); light->setPosition(osg::Vec4(position,1.0f)); light->setAmbient(osg::Vec4(0.00f,0.00f,0.05f,1.0f)); light->setDiffuse(osg::Vec4(1.0f,1.0f,1.0f,1.0f)); group->addChild(lightsource); // create tex gen. osg::Vec3 up(0.0f,0.0f,1.0f); up = (direction ^ up) ^ direction; up.normalize(); osg::TexGenNode* texgenNode = new osg::TexGenNode; texgenNode->setTextureUnit(textureUnit); osg::TexGen* texgen = texgenNode->getTexGen(); texgen->setMode(osg::TexGen::EYE_LINEAR); texgen->setPlanesFromMatrix(osg::Matrixd::lookAt(position, position+direction, up)* osg::Matrixd::perspective(angle,1.0,0.1,100)* osg::Matrixd::translate(1.0,1.0,1.0)* osg::Matrixd::scale(0.5,0.5,0.5)); group->addChild(texgenNode); return group; } osg::AnimationPath* createAnimationPath(const osg::Vec3& center,float radius,double looptime) { // set up the animation path osg::AnimationPath* animationPath = new osg::AnimationPath; animationPath->setLoopMode(osg::AnimationPath::LOOP); int numSamples = 40; float yaw = 0.0f; float yaw_delta = 2.0f*osg::PI/((float)numSamples-1.0f); float roll = osg::inDegrees(30.0f); double time=0.0f; double time_delta = looptime/(double)numSamples; for(int i=0;i<numSamples;++i) { osg::Vec3 position(center+osg::Vec3(sinf(yaw)*radius,cosf(yaw)*radius,0.0f)); 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))); animationPath->insert(time,osg::AnimationPath::ControlPoint(position,rotation)); yaw += yaw_delta; time += time_delta; } return animationPath; } osg::Node* createBase(const osg::Vec3& center,float radius) { osg::Geode* geode = new osg::Geode; // set up the texture of the base. osg::StateSet* stateset = new osg::StateSet(); osg::Image* image = osgDB::readImageFile("Images/lz.rgb"); if (image) { osg::Texture2D* texture = new osg::Texture2D; texture->setImage(image); stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON); } geode->setStateSet( stateset ); osg::HeightField* grid = new osg::HeightField; grid->allocate(38,39); grid->setOrigin(center+osg::Vec3(-radius,-radius,0.0f)); grid->setXInterval(radius*2.0f/(float)(38-1)); grid->setYInterval(radius*2.0f/(float)(39-1)); float minHeight = FLT_MAX; float maxHeight = -FLT_MAX; unsigned int r; for(r=0;r<39;++r) { for(unsigned int c=0;c<38;++c) { float h = vertex[r+c*39][2]; if (h>maxHeight) maxHeight=h; if (h<minHeight) minHeight=h; } } float hieghtScale = radius*0.5f/(maxHeight-minHeight); float hieghtOffset = -(minHeight+maxHeight)*0.5f; for(r=0;r<39;++r) { for(unsigned int c=0;c<38;++c) { float h = vertex[r+c*39][2]; grid->setHeight(c,r,(h+hieghtOffset)*hieghtScale); } } geode->addDrawable(new osg::ShapeDrawable(grid)); osg::Group* group = new osg::Group; group->addChild(geode); return group; } osg::Node* createMovingModel(const osg::Vec3& center, float radius) { float animationLength = 10.0f; osg::AnimationPath* animationPath = createAnimationPath(center,radius,animationLength); osg::Group* model = new osg::Group; osg::Node* cessna = osgDB::readNodeFile("cessna.osgt"); if (cessna) { const osg::BoundingSphere& bs = cessna->getBound(); float size = radius/bs.radius()*0.3f; osg::MatrixTransform* positioned = new osg::MatrixTransform; positioned->setDataVariance(osg::Object