Ogre的材质创建和应用

参考：http://blog.csdn.net/butwang/article/details/5807707

参考：http://blog.csdn.net/pizi0475/article/details/6341726

参考：Ogre 3d 1.7 beginner Guide 中文版.doc

Ogre材质的创建可以通过脚本或代码创建：层级 Material -〉technique -> pass -> texture_unit

Ogre的材质具有动态的效果，提供有animation，rotate，scroll，mirror等效果

Ogre中的材质可以在mesh创建时指定材质，也可以在entiry创建时重新制定材质。

通过脚本创建材质：(*.material)

material MyMaterial1
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture leaf.png
			}
		}
	}
}

通过代码创建一个简单材质：

// 添加一种新材质
Ogre::MaterialPtr m_pManualMat = Ogre::MaterialManager::getSingletonPtr()->create("manualMaterial1", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
// 设置图片纹理
Ogre::TextureUnitState* m_pTexUnitState = m_pManualMat->getTechnique(0)->getPass(0)->createTextureUnitState("ogrelogo-small.jpg");
// 设置图片纹理旋转或其他变换
m_pTexUnitState->setTextureRotate(Ogre::Radian(Ogre::Degree(45)));

通过脚本创建动态材质：

分别为：

"MyMaterial4"  - rock + clamp

"MyMaterial5"  - leaf + mirror

"MyMaterial6"- leaf + border

"MyMaterial7"- leaf + border + bordercolor

"MyMaterial8"- rock + scroll + scroll animation

"MyMaterial11"- rock + rotate animation

"MyMaterial12"-  "MyMaterial11" -> water = water + rotate animation

material MyMaterial4
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture terr_rock6.jpg
				tex_address_mode clamp
			}
		}
	}
}
material MyMaterial5
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture leaf.png
				tex_address_mode mirror
			}
		}
	}
}
material MyMaterial6
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture leaf.png
				tex_address_mode border
			}
		}
	}
}
material MyMaterial7
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture leaf.png
				tex_address_mode border
				tex_border_colour 0 0 1
			}
		}
	}
}
material MyMaterial8
{
	technique
	{
		pass
		{
			texture_unit
			{
				texture terr_rock6.jpg
				scroll 0.8 0.8
				scroll_anim 0.01 0.01
			}
		}
	}
}
material MyMaterial11
{
	technique
	{
		pass
		{
			texture_unit texture1
			{
				texture terr_rock6.jpg
				rotate_anim 0.1
			}
		}
	}
}
material MyMaterial12 : MyMaterial11
{
	set_texture_alias texture1 Water02.jpg
}

材质应用：

1. 创建ManualObject时初始指定材质： (注意：a. 三角型逆时针  b.材质左上点为0,0, 右下点为1,1)

	 // add a quad for material
 	Ogre::ManualObject* pQuad = mSceneMgr->createManualObject("Quad");
	pQuad->begin("<strong><span style="color:#000099;BACKGROUND-COLOR: #cccccc">manualMaterial1</span></strong>", RenderOperation::OT_TRIANGLE_LIST);

	pQuad->position(0, 0, 0);
	pQuad->textureCoord(0, 1);

	pQuad->position(20, 0, 0);
	pQuad->textureCoord(1, 1);

	pQuad->position(20, 20, 0);
	pQuad->textureCoord(1, 0);

	pQuad->position(0, 20, 0);
	pQuad->textureCoord(0, 0);

	pQuad->triangle(0, 1, 2);
	pQuad->triangle(2, 3, 0);
	pQuad->end();
	pQuad->convertToMesh("Quad");

2. 创建entity后重新指定材质

	Ogre::Entity* pQuadEnt2 = mSceneMgr->createEntity("Quad");
	pQuadEnt2->setMaterialName("<strong><span style="color:#000099;BACKGROUND-COLOR: #cccccc">MyMaterial12</span></strong>");	// water + roate
	Ogre::SceneNode* pQuadNode2 = mSceneMgr->createSceneNode();
	pQuadNode2->attachObject(pQuadEnt2);

3. 创建plane entity时指定材质

 	// create plane
 	Ogre::Plane plane(Ogre::Vector3(0, 1, 0), -50);
 	Ogre::MeshManager::getSingleton().createPlane("planeMesh", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME
  	, plane, 1500.0, 1500.0, 200, 200, true, 1, 5, 5, Ogre::Vector3::UNIT_Z);
 	Ogre::Entity* pPlaneEnt = mSceneMgr->createEntity("planeMesh");
 	pPlaneEnt->setMaterialName("Examples/GrassFloor");

 	Ogre::SceneNode* pPlaneNode = mSceneMgr->createSceneNode();
 	pPlaneNode->attachObject(pPlaneEnt);