Brute Force (HeightMap) For Terrain Rendering

Triangle Num:32768

FPS < 30

Environment： 6G-ddr3, i5-480m

Brute Force not very userful for nowadays game, due to its poor fps. I'm a novice for terrain rendering, maybe the "LOD" could increase the fps. 

How to do : Here is the principle and below is the code(yes, I use Ogre O>_<O).

?

void createScene()

    {

        // load terrain map

        if(myTerrain.LoadHeightMap("height.dat", TERRAIN_SIZE))

        {

            myTerrain.SetHeightScale(0.25f);

        }

        else

        {

            return;

        }

 

        //config the light

        /*Ogre::Light* light = mSceneMgr->createLight("Light1");

        light->setType(Ogre::Light::LT_DIRECTIONAL);

        light->setDirection(Ogre::Vector3(1,-1,0));*/

 

        Ogre::MaterialPtr mat = Ogre::MaterialManager::getSingleton().create("myMaterialWithNoCulling",

            Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);

        mat->setCullingMode(Ogre::CULL_NONE );

        mat->setSceneBlending(Ogre::SBT_ADD);

 

        Ogre::ManualObject* manual = mSceneMgr->createManualObject("MyTerrain");

        manual->begin("myMaterialWithNoCulling", RenderOperation::OT_TRIANGLE_LIST);

        float fColor;

        for(int iz = 0; iz < TERRAIN_SIZE - 1; ++iz)

        {

            for(int ix = 0; ix < TERRAIN_SIZE - 1 ; ++ix)

            {

 

                fColor = myTerrain.GetTrueHeightAtPoint(ix, iz);

                manual->position(ix, myTerrain.GetScaledHeightAtPoint(ix,iz), iz);

                manual->colour(fColor, fColor, fColor);

 

                fColor = myTerrain.GetTrueHeightAtPoint(ix + 1, iz);

                manual->position(ix + 1, myTerrain.GetScaledHeightAtPoint(ix + 1,iz), iz);

                manual->colour(fColor, fColor, fColor);

 

                fColor = myTerrain.GetTrueHeightAtPoint(ix, iz + 1);

                manual->position(ix, myTerrain.GetScaledHeightAtPoint(ix,iz + 1), iz + 1);

                manual->colour(fColor, fColor, fColor);

 

                fColor = myTerrain.GetTrueHeightAtPoint(ix, iz + 1);

                manual->position(ix, myTerrain.GetScaledHeightAtPoint(ix,iz + 1), iz + 1);

                manual->colour(fColor, fColor, fColor);

 

                fColor = myTerrain.GetTrueHeightAtPoint(ix + 1, iz);

                manual->position(ix + 1, myTerrain.GetScaledHeightAtPoint(ix + 1,iz), iz);

                manual->colour(fColor, fColor, fColor);

 

                fColor = myTerrain.GetTrueHeightAtPoint(ix + 1, iz + 1);

                manual->position(ix + 1, myTerrain.GetScaledHeightAtPoint(ix + 1,iz + 1), iz + 1);

                manual->colour(fColor, fColor, fColor);

            }

        }

 

        manual->end();

 

        /*manual->convertToMesh("bruteForceTerrain");

 

        Ogre::Entity* terrainMesh = mSceneMgr->createEntity("bruteForceTerrain");*/

 

        mSceneMgr->getRootSceneNode()->createChildSceneNode()->attachObject(manual);

    }