[Solved] Object floats in the air

I used OgreMax with OgreNewt to load entity and scene into space.
But cylinder floats in the air.




OgreMax::OgreMaxScene* mScene = new OgreMax::OgreMaxScene();
mScene->Load("demoField.scene",mWindow, OgreMax::OgreMaxScene::NO_OPTIONS,mSceneMgr,mSceneMgr->getRootSceneNode(),0);
SceneManager *mgr = mScene->GetSceneManager();

OgreNewt::CollisionPrimitives::TreeCollisionSceneParser *col = new OgreNewt::CollisionPrimitives::TreeCollisionSceneParser(mWorld);
col->parseScene ( mgr->getSceneNode("terrain"), true );

mSceneMgr->showBoundingBoxes(true);

OgreNewt::Body *body = new OgreNewt::Body(mWorld,col);
body->attachToNode( mgr->getSceneNode("terrain") );

Ogre::Vector3 size = Ogre::Vector3( 10.3, 10.5, 10.5 );
Ogre::SceneNode* node = mSceneMgr->getRootSceneNode()->createChildSceneNode();
Ogre::Entity* ent = mSceneMgr->createEntity("cylinder_body", "cylinder.mesh" );
node->attachObject( ent );
node->setScale( size );

// rigid body.
OgreNewt::Collision* col2 = new OgreNewt::CollisionPrimitives::Cylinder( mWorld, 10.5, 10.3 );
OgreNewt::Body* bod = new OgreNewt::Body( mWorld, col2 );
bod->attachToNode( node );

// initial position
bod->setPositionOrientation( Ogre::Vector3(-2,900,2), Ogre::Quaternion::IDENTITY );
delete col2;

Ogre::Real mass = 10000.0;
Ogre::Vector3 inertia = OgreNewt::MomentOfInertia::CalcCylinderSolid( mass, 40.0, 40.0 );

bod->setMassMatrix( mass, inertia );
bod->setStandardForceCallback();

<scene formatVersion="1.0" upAxis="y" unitsPerMeter="39.3701" minOgreVersion="1.4" author="OgreMax Scene Exporter by Derek Nedelman (www.ogremax.com)">
<resourceLocations>
<resourceLocation type="FileSystem" name="../material/" recursive="false" />
<resourceLocation type="FileSystem" name="../material/shader/" recursive="false" />
<resourceLocation type="FileSystem" name="../mesh/" recursive="false" />
<resourceLocation type="FileSystem" name="../mesh/char/" recursive="false" />
<resourceLocation type="FileSystem" name="../mesh/object/" recursive="false" />
<resourceLocation type="FileSystem" name="../mesh/plant/" recursive="false" />
<resourceLocation type="FileSystem" name="../mesh/terrain/" recursive="false" />
<resourceLocation type="FileSystem" name="../texture/char/" recursive="false" />
<resourceLocation type="FileSystem" name="../texture/object/" recursive="false" />
<resourceLocation type="FileSystem" name="../texture/plant/" recursive="false" />
<resourceLocation type="FileSystem" name="../texture/sky/" recursive="false" />
<resourceLocation type="FileSystem" name="../texture/temp/" recursive="false" />
<resourceLocation type="FileSystem" name="../texture/terrain/" recursive="false" />
<resourceLocation type="FileSystem" name="../texture/water/" recursive="false" />
</resourceLocations>
<environment>
<clipping near="1" far="10000" />
<colourAmbient r="0.776471" g="0.776471" b="0.776471" />
<colourBackground r="1" g="1" b="1" />
<skyBox enable="true" material="SkyBox" distance="4000" drawFirst="true">
<rotation qx="0" qy="0" qz="0" qw="1" />
</skyBox>
</environment>
<nodes>
<node name="Direct01">
<scale x="77.2652" y="77.2652" z="77.2652" />
<position x="175.049" y="2899.07" z="2793.34" />
<rotation qx="-0.916921" qy="-0.0077486" qz="0.0178248" qw="-0.398595" />
<trackTarget nodeName="Direct01.Target">
<localDirection x="0" y="0" z="1" />
</trackTarget>
<animations>
<animation name="Direct01" enable="true" loop="true" interpolationMode="spline" length="3.33354">
<keyframe time="0">
<translation x="175.049" y="2899.07" z="2793.34" />
<rotation qx="-0.916921" qy="-0.0077486" qz="0.0178248" qw="-0.398595" />
<scale x="77.2652" y="77.2652" z="77.2652" />
</keyframe>
<keyframe time="3.33333">
<translation x="435.146" y="2899.07" z="2167.74" />
<rotation qx="-0.904715" qy="-0.019946" qz="0.0426195" qw="-0.423409" />
<scale x="77.2652" y="77.2652" z="77.2652" />
</keyframe>
</animation>
</animations>
<light name="Direct01" id="91" type="directional" castShadows="false" power="1">
<colourDiffuse r="1" g="1" b="1" />
<colourSpecular r="1" g="1" b="1" />
<lightAttenuation range="200" constant="1" linear="0" quadric="0" />
</light>
</node>
<node name="Direct01.Target" id="107">
<scale x="4.06697" y="4.06697" z="4.06698" />
<position x="-48.4979" y="-3266.94" z="-2954.2" />
<rotation qx="0.340231" qy="0.23592" qz="-0.0886005" qw="0.905944" />
</node>
<node name="terrain">
<scale x="1" y="1" z="1" />
<position x="0" y="0" z="0" />
<rotation qx="0" qy="0" qz="0" qw="1" />
<entity name="terrain" id="110" meshFile="terrain.mesh" castShadows="true" receiveShadows="true">
<subentities>
<subentity index="0" materialName="Terrain" />
</subentities>
</entity>
</node>
</nodes>
</scene>


How can I fix this problem ?
How can I get scenenode from scene script ?
Why cylinder floats in the air ?


// initial position
bod->setPositionOrientation( Ogre::Vector3(-2,900,2), Ogre::Quaternion::IDENTITY


This line tells me that may be you are not setting the worldsize, by default, the world size is (-100,-100,-100)(100,100,100), try using mWorld->setWorldSize().

And use OgreNewt::Debugger class, to see the collision bodies, this help a lot to find problems.

Thanks ProfesorX. It works!

I can't see debugger line or any addition line when i use debugger class.

mSceneMgr = mRoot->createSceneManager(ST_GENERIC , "ExampleSMInstance");
OgreNewt::Debugger &debugger = OgreNewt::Debugger::getSingleton();
debugger.init(mSceneMgr);
debugger.showLines(mWorld);

you need to call "showLines" each frame, to see the physics world update.

you need to call "showLines" each frame, to see the physics world update.

Thanks walaber.
You should put this into doxygen doc

col->parseScene ( mgr->getSceneNode("terrain"), true );

why , I cant find the "parseScene()"???

I use Ogremax2.3.