osg::Node* createPyramidModel() { // create the root node which will hold the model. osg::Group* root = new osg::Group(); // turn off lighting root->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF); osg::Geode* pyramidGeode = new osg::Geode(); osg::Geometry* pyramidGeometry = new osg::Geometry(); pyramidGeode->setUpdateCallback(new TextureCoordUpdateCallback(0.01)); pyramidGeode->setDataVariance(osg::Object::DYNAMIC); pyramidGeode->addDrawable(pyramidGeometry); root->addChild(pyramidGeode); osg::Vec3Array* pyramidVertices = new osg::Vec3Array; pyramidVertices->push_back(osg::Vec3(0, 0, 0)); // 左前 pyramidVertices->push_back(osg::Vec3(10, 0, 0)); // 右前 pyramidVertices->push_back(osg::Vec3(10, 10, 0)); // 右后 pyramidVertices->push_back(osg::Vec3(0, 10, 0)); // 左后 pyramidVertices->push_back(osg::Vec3(5, 5, 10)); // 塔尖 pyramidGeometry->setVertexArray(pyramidVertices); osg::DrawElementsUInt* pyramidBase = new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0); pyramidBase->push_back(3); pyramidBase->push_back(2); pyramidBase->push_back(1); pyramidBase->push_back(0); pyramidGeometry->addPrimitiveSet(pyramidBase); osg::DrawElementsUInt* pyramidFaceOne = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0); pyramidFaceOne->push_back(0); pyramidFaceOne->push_back(1); pyramidFaceOne->push_back(4); pyramidGeometry->addPrimitiveSet(pyramidFaceOne); osg::DrawElementsUInt* pyramidFaceTwo = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0); pyramidFaceTwo->push_back(1); pyramidFaceTwo->push_back(2); pyramidFaceTwo->push_back(4); pyramidGeometry->addPrimitiveSet(pyramidFaceTwo); osg::DrawElementsUInt* pyramidFaceThree = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0); pyramidFaceThree->push_back(2); pyramidFaceThree->push_back(3); pyramidFaceThree->push_back(4); pyramidGeometry->addPrimitiveSet(pyramidFaceThree); osg::DrawElementsUInt* pyramidFaceFour = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0); pyramidFaceFour->push_back(3); pyramidFaceFour->push_back(0); pyramidFaceFour->push_back(4); pyramidGeometry->addPrimitiveSet(pyramidFaceFour); osg::Vec4Array* colors = new osg::Vec4Array; colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f)); //红色 colors->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f)); //绿色 colors->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f)); //蓝色 colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f)); //白色 pyramidGeometry->setColorArray(colors); pyramidGeometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX); osg::Vec3Array* normals = new osg::Vec3Array(1); (*normals)[0].set(0.0f, -1.0f, 0.0f); pyramidGeometry->setNormalArray(normals, osg::Array::BIND_OVERALL); osg::Vec2Array* texcoords = new osg::Vec2Array(5); (*texcoords)[0].set(0.00f, 0.0f); (*texcoords)[1].set(0.25f, 0.0f); (*texcoords)[2].set(0.50f, 0.0f); (*texcoords)[3].set(0.75f, 0.0f); (*texcoords)[4].set(0.50f, 1.0f); pyramidGeometry->setTexCoordArray(0, texcoords); // set up the texture state. osg::Texture2D* texture = new osg::Texture2D; texture->setDataVariance(osg::Object::DYNAMIC); // protect from being optimized away as static state. texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR); texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR); texture->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::REPEAT); texture->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::REPEAT); texture->setImage(osgDB::readImageFile("Images/road.png")); osg::StateSet* stateset = pyramidGeometry->getOrCreateStateSet(); stateset->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON); return root; }
class TextureCoordUpdateCallback : public osg::NodeCallback { public: TextureCoordUpdateCallback(double delay = 1.0) : _delay(delay), _prevTime(0.0) { } virtual void operator()(osg::Node* node, osg::NodeVisitor* nv) { if (nv->getFrameStamp()) { double currTime = nv->getFrameStamp()->getSimulationTime(); if (currTime - _prevTime > _delay) { osg::Geode* geode = node->asGeode(); osg::Geometry* geom = geode->getDrawable(0)->asGeometry(); // 获取纹理坐标数组 osg::Array* tmp = geom->getTexCoordArray(0); osg::Vec2Array* coorArray = (osg::Vec2Array*) tmp; auto it = coorArray->begin(); for (; it < coorArray->end(); it++) { // 动起来 it->x() += 0.001; } // 更新纹理坐标数组 geom->setTexCoordArray(0, coorArray); // record time _prevTime = currTime; } } } protected: double _delay; double _prevTime; };