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            場景查詢
            創建查詢的代價比較大,而執行不是。SceneQueryResualt只定義了兩種成員:movables與worldFragments.
            掩碼也需要自己定義,自己解釋。在一個軸對齊盒子中查詢燈光的例子如下:
            const unsigned int LIGHT_QUERY_MASK = 0x00000001; //掩碼定義
            Light* light1 = mSceneMgr->createLight("Light1");
            Light* light2 = mSceneMgr->createLight("Light2");
            light1->setPosition(12, 12, 12);
            light2->setPosition(5, 5, 5);
            light1->setQueryFlags(LIGHT_QUERY_MASK);
            light2->setQueryFlags(LIGHT_QUERY_MASK);
            AxisAlignedBoxSceneQuery* lightQuery =
            mSceneMgr->createAABBQuery(
            AxisAlignedBox(0, 0, 0, 10, 10, 10), LIGHT_QUERY_MASK);
            // sometime later in the application's code, find out what lights are in the box
            SceneQueryResult& results = lightQuery->execute(); //查詢
            // iterate through the list of items returned; there should only be one, and it
            // should be light2 created above. The list iterator is MovableObject type.
            SceneQueryResultMovableList::iterator it = results.movables.begin();
            for (; it != results.movables.end(); it++)
            {
            // act only on the lights, which should be all we have
            assert ((*it)->getQueryFlags() & LIGHT_QUERY_MASK) != 0);
            // do whatever it was we needed to do with the lights
            }
            // destroy the query when we are done with it
            mSceneMgr->destroyQuery(lightQuery);

            我們知道地形總是起伏不平的,當主角在上面行走時需要根據地形的高度調整,可以光線查詢來實現。
            原理比較簡單:向主角腳下執行光線查詢,與地形有一個交點,根據交點的高度調整主角位置。
            Terrain Clamping
            void Entity::clampToTerrain() {
            static Ogre::Ray updateRay;
            updateRay.setOrigin(m_controlledNode->getPosition() + Ogre::Vector3(0, 15, 0));
            updateRay.setDirection(Ogre::Vector3::NEGATIVE_UNIT_Y);
            m_raySceneQuery->setRay(updateRay);
            Ogre::RaySceneQueryResult& qryResult = m_raySceneQuery->execute();
            if (qryResult.size() == 0) {
            // then we are under the terrain and need to pop above it
            updateRay.setOrigin(m_controlledNode->getPosition());
            updateRay.setDirection(Ogre::Vector3::UNIT_Y);
            m_raySceneQuery->setRay(updateRay);
            }
            qryResult = m_raySceneQuery->execute();
            Ogre::RaySceneQueryResult::iterator i = qryResult.begin();
            if (i != qryResult.end() && i->worldFragment)
            {
            Ogre::SceneQuery::WorldFragment* wf = i->worldFragment;
            m_controlledNode->setPosition(m_controlledNode->getPosition().x,
            i->worldFragment->singleIntersection.y,
            m_controlledNode->getPosition().z);
            }
            }
            void Entity::init()
            {
            // lots of other irrelevant entity init stuff goes here
            m_raySceneQuery = sm->createRayQuery(
            Ogre::Ray(m_controlledNode->getPosition(),
            Ogre::Vector3::NEGATIVE_UNIT_Y));
            // move this node is such a way that it is above the terrain
            clampToTerrain();
            }

            posted on 2007-03-11 17:24 清源游民 閱讀(1160) 評論(0)  編輯 收藏 引用 所屬分類: OGRE
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