the ShadowMap is not correct !

zhucde

03-02-2010 05:59:27

I use ETL(ETM has the same problem), i generate terrain shadow with follow code:







Ogre::ColourValue color(mSunLight->getDiffuseColour().r,mSunLight->getDiffuseColour().g,mSunLight->getDiffuseColour().b);

	 	Ogre::Vector3 direction = mSunLight->getDirection();

		

	 	direction.normalise();

	 	if(direction.x == 0.0f && direction.z == 0.0f) return;

	 	// calculate new lightmap

	 	ET::ColourArray2D mArray (m_LightMapSize,m_LightMapSize, Ogre::ColourValue::White);

 	 	ET::generateLightMap(mArray, m_Terrain, direction,

 	 		color, mSceneMgr->getAmbientLight());

	 	ET::generateShadowMap(mArray, m_Terrain, direction, mShadowColor );

	 	ET::boxFilter(mArray, 2);  //blur

	 	m_LightMap->setColourArray(mArray);

	 	m_LightMap->update();

the result is :
[attachment=1]裁剪.jpg[/attachment]

you see, the terrain's shadow is not correct, it won't farther than tree's shadow, tree's shadow generated by OGRE shadow technology,
correct is :
[attachment=0]裁剪3.jpg[/attachment]

what's wrong ? anybody help me?