// Given a scene node for a terrain, find the manual object on that scene node and // update the manual object with the heightmap passed. If there is no manual object on // the scene node, remove all it's attachments and add the manual object. // The heightmap is passed in a 1D array ordered by width rows (for(width) {for(length) {hm[w,l]}}) // This must be called between frames since it touches the scene graph // BETWEEN FRAME OPERATION void Region::UpdateTerrain(const int hmWidth, const int hmLength, const float* hm) { Ogre::SceneNode* node = this->TerrainSceneNode; LG::Log("Region::UpdateTerrain: updating terrain for region %s", this->Name.c_str()); if (node == NULL) { LG::Log("Region::UpdateTerrain: terrain scene node doesn't exist. Not updating terrain."); return; } // Find the movable object attached to the scene node. If not found remove all. if (node->numAttachedObjects() > 0) { Ogre::MovableObject* attached = node->getAttachedObject(0); if (attached->getMovableType() != "ManualObject") { // don't know why this would ever happen but clean out the odd stuff LG::Log("Found extra stuff on terrain scene node"); node->detachAllObjects(); } } // if there is not a manual object on the node, create a new one if (node->numAttachedObjects() == 0) { LG::Log("Region::UpdateTerrain: creating terrain ManualObject for region %s", this->Name.c_str()); // if no attached objects, we add our dynamic ManualObject Ogre::ManualObject* mob = LG::RendererOgre::Instance()->m_sceneMgr->createManualObject("ManualObject/" + node->getName()); mob->addQueryFlags(Ogre::SceneManager::WORLD_GEOMETRY_TYPE_MASK); mob->setDynamic(true); mob->setCastShadows(true); mob->setVisible(true); node->attachObject(mob); // m_visCalc->RecalculateVisibility(); } Ogre::ManualObject* mo = (Ogre::ManualObject*)node->getAttachedObject(0); // stuff our heightmap information into the dynamic manual object mo->estimateVertexCount(hmWidth * hmLength); mo->estimateIndexCount(hmWidth * hmLength * 6); if (mo->getNumSections() == 0) { // if first time mo->begin(LG::GetParameter("Renderer.Ogre.DefaultTerrainMaterial")); } else { mo->beginUpdate(0); // we've been here before } int loc = 0; for (int xx = 0; xx < hmWidth; xx++) { for (int yy = 0; yy < hmLength; yy++) { mo->position((Ogre::Real)xx, (Ogre::Real)yy, hm[loc++]); mo->textureCoord((float)xx / (float)hmWidth, (float)yy / (float)hmLength); mo->normal(0.0, 1.0, 0.0); // always up (for the moment) } } for (int px = 0; px < hmLength-1; px++) { for (int py = 0; py < hmWidth-1; py++) { mo->quad(px + py * hmWidth, px + (py + 1) * hmWidth, (px + 1) + (py + 1) * hmWidth, (px + 1) + py * hmWidth ); } } mo->end(); return; }