Fifteenth Demo of OGRE-优快云博客

本文链接：https://blog.youkuaiyun.com/yuyunliuhen/article/details/5726525

本文介绍如何使用Ogre游戏引擎创建草地效果。通过构建草叶片子的网格，并利用StaticGeometry类将多个实例放置在场景中，实现逼真的草地渲染效果。文中详细展示了创建过程中的关键代码。

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#include "ExampleApplication.h" class TutorialApplication : public ExampleApplication { protected: public: TutorialApplication() { } ~TutorialApplication() { } protected: MeshPtr mGrassMesh; void createGrassMesh() { const float width = 25; const float height = 30; ManualObject mo("GrassObject"); Vector3 vec(width/2, 0, 0); Quaternion rot; rot.FromAngleAxis(Degree(60), Vector3::UNIT_Y); mo.begin("Examples/GrassBlades", RenderOperation::OT_TRIANGLE_LIST); for (int i = 0; i < 3; ++i) { mo.position(-vec.x, height, -vec.z); mo.textureCoord(0, 0); mo.position(vec.x, height, vec.z); mo.textureCoord(1, 0); mo.position(-vec.x, 0, -vec.z); mo.textureCoord(0, 1); mo.position(vec.x, 0, vec.z); mo.textureCoord(1, 1); int offset = i * 4; mo.triangle(offset, offset+3, offset+1); mo.triangle(offset, offset+2, offset+3); vec = rot * vec; } mo.end(); mo.convertToMesh("GrassBladesMesh"); } void createScene(void) { createGrassMesh(); mSceneMgr->setAmbientLight(ColourValue(1, 1, 1)); mCamera->setPosition(150, 50, 150); mCamera->lookAt(0, 0, 0); Entity *robot = mSceneMgr->createEntity("robot", "robot.mesh"); mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(robot); Plane plane; plane.normal = Vector3::UNIT_Y; plane.d = 0; MeshManager::getSingleton().createPlane("floor", ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, plane, 450,450,10,10,true,1,50,50,Vector3::UNIT_Z); Entity* pPlaneEnt = mSceneMgr->createEntity("plane", "floor"); pPlaneEnt->setMaterialName("Examples/GrassFloor"); pPlaneEnt->setCastShadows(false); mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(pPlaneEnt); Entity *grass = mSceneMgr->createEntity("grass", "GrassBladesMesh"); StaticGeometry *sg = mSceneMgr->createStaticGeometry("GrassArea"); const int size = 375; const int amount = 20; sg->setRegionDimensions(Vector3(size, size, size)); sg->setOrigin(Vector3(-size/2, 0, -size/2)); for (int x = -size/2; x < size/2; x += (size/amount)) for (int z = -size/2; z < size/2; z += (size/amount)) { Real r = size / (float)amount / 2; Vector3 pos(x + Math::RangeRandom(-r, r), 0, z + Math::RangeRandom(-r, r)); Vector3 scale(1, Math::RangeRandom(0.9, 1.1), 1); Quaternion orientation; orientation.FromAngleAxis(Degree(Math::RangeRandom(0, 359)), Vector3::UNIT_Y); sg->addEntity(grass, pos, orientation, scale); } sg->build(); } }; INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR strCmdLine, INT ) { // Create application object TutorialApplication app; try { app.go(); } catch( Ogre::Exception& e ) { MessageBox( NULL, e.getFullDescription().c_str(), "An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL); } return 0; }