Create a mesh by ogre

There is a tutorial on the official website, but the format is messy when the code is copied, and you have to adjust it yourself.

void createColourCube() { /// Create the mesh via the MeshManager Ogre::MeshPtr msh = MeshManager::getSingleton().createManual("ColourCube", "General");  /// Create one submesh SubMesh* sub = msh->createSubMesh();  const float sqrt13 = 0.577350269f; /* sqrt(1/3) */  /// Define the vertices (8 vertices, each consisting of 2 groups of 3 floats const size_t nVertices = 8; const size_t vbufCount = 3*2*nVertices; float vertices[vbufCount] = { -100.0,100.0,-100.0, //0 position -sqrt13,sqrt13,-sqrt13, //0 normal 100.0,100.0,-100.0, //1 position sqrt13,sqrt13,-sqrt13, //1 normal 100.0,-100.0,-100.0, //2 position sqrt13,-sqrt13,-sqrt13, //2 normal -100.0,-100.0,-100.0, //3 position-sqrt13,-sqrt13,-sqrt13, //3 normal -100.0,100.0,100.0, //4 position -sqrt13,sqrt13,sqrt13, //4 normal 100.0,100.0,100.0, //5 position sqrt13,sqrt13,sqrt13, //5 normal 100.0,-100.0,100.0, //6 position sqrt13,-sqrt13,sqrt13, //6 normal -100.0,-100.0,100.0, //7 position-sqrt13,-sqrt13,sqrt13, //7 normal};  RenderSystem* rs = Root::getSingleton().getRenderSystem(); RGBA colours[nVertices]; RGBA *pColour = colours;// Use render system to convert colour value since colour packing varies rs->convertColourValue(ColourValue(1.0,0.0,0.0), pColour++); //0 colourrs->convertColourValue(ColourValue(1.0,1.0,0.0), pColour++); //1 colour rs->convertColourValue(ColourValue(0.0,1.0,0.0), pColour++); //2 colour rs->convertColourValue(ColourValue(0.0,0.0,0.0), pColour++); //3 colour rs->convertColourValue(ColourValue(1.0,0.0,1.0), pColour++); //4 colourrs->convertColourValue(ColourValue(1.0,1.0,1.0), pColour++); //5 colour rs->convertColourValue(ColourValue(0.0,1.0,1.0), pColour++); //6 colour rs->convertColourValue(ColourValue(0.0,0.0,1.0), pColour++); //7 colour  /// Define 12 triangles (two triangles per cube face) /// The values in this table refer to vertices in the above table const size_t ibufCount = 36; unsigned short faces[ibufCount] = { 0,2,3, 0,1,2, 1,6,2, 1,5,6, 4,6,5, 4,7,6, 0,7,4, 0,3,7, 0,5,1, 0,4,5, 2,7,3, 2,6,7 };  /// Create vertex data structure for 8 vertices shared between submeshes msh->sharedVertexData = new VertexData();msh->sharedVertexData->vertexCount = nVertices;  /// Create declaration (memory format) of vertex data VertexDeclaration* decl = msh->sharedVertexData->vertexDeclaration; size_t offset = 0;// 1st buffer decl->addElement(0, offset, VET_FLOAT3, VES_POSITION); offset += VertexElement::getTypeSize(VET_FLOAT3); decl->addElement(0, offset, VET_FLOAT3, VES_NORMAL); offset += VertexElement::getTypeSize(VET_FLOAT3); /// Allocate vertex buffer of the requested number of vertices (vertexCount) /// and bytes per vertex (offset) HardwareVertexBufferSharedPtr vbuf =        HardwareBufferManager::getSingleton().createVertexBuffer(      offset, msh->sharedVertexData->vertexCount, HardwareBuffer::HBU_STATIC_WRITE_ONLY); /// Upload the vertex data to the card vbuf->writeData(0, vbuf->getSizeInBytes(), vertices, true); /// Set vertex buffer binding so buffer 0 is bound to our vertex buffer VertexBufferBinding* bind = msh->sharedVertexData->vertexBufferBinding;  bind->setBinding(0, vbuf);  // 2nd buffer offset = 0; decl->addElement(1, offset, VET_COLOUR, VES_DIFFUSE); offset += VertexElement::getTypeSize(VET_COLOUR); /// Allocate vertex buffer of the requested number of vertices (vertexCount)  /// and bytes per vertex (offset) vbuf = HardwareBufferManager::getSingleton().createVertexBuffer( offset, msh->sharedVertexData->vertexCount, HardwareBuffer::HBU_STATIC_WRITE_ONLY); /// Upload the vertex data to the card vbuf->writeData(0, vbuf->getSizeInBytes(), colours, true);  /// Set vertex buffer binding so buffer 1 is bound to our colour buffer bind->setBinding(1, vbuf);  /// Allocate index buffer of the requested number of vertices (ibufCount)  HardwareIndexBufferSharedPtr ibuf = HardwareBufferManager::getSingleton(). createIndexBuffer( HardwareIndexBuffer::IT_16BIT,  ibufCount,  HardwareBuffer::HBU_STATIC_WRITE_ONLY);  /// Upload the index data to the card ibuf->writeData(0, ibuf->getSizeInBytes(), faces, true);  /// Set parameters of the submesh sub->useSharedVertices = true; sub->indexData->indexBuffer = ibuf; sub->indexData->indexCount = ibufCount; sub->indexData->indexStart = 0;  /// Set bounding information (for culling) msh->_setBounds(AxisAlignedBox(-100,-100,-100,100,100,100)); msh->_setBoundingSphereRadius(Math::Sqrt(3*100*100));  /// Notify -Mesh object that it has been loaded msh->load(); }