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//first submesh
float vertices[32] = {
        -100, -100, 0,  // pos
        0,0,1,          // normal
        0,1,            // texcoord
        100, -100, 0,
        0,0,1,
        1,1,
        100,  100, 0,
        0,0,1,
        1,0,
        -100,  100, 0 ,
        0,0,1,
        0,0
    };
// second submesh
   float vertices1[32] = {
        -100, 0, -100,  // pos
        0,1,0,          // normal
        0,1,            // texcoord
        100, 0, -100,
        0,1,0,
        1,1,
        100,  0, 100,
        0,1,0,
        1,0,
        -100,  0, 100 ,
        0,1,0,
        0,0
    };
  uint16 faces[6] = {0,1,2,
                       0,2,3 };

    uint16 faces1[6] = {0,1,2,
                       0,2,3 };


    MeshPtr mainMesh = MeshManager::getSingleton().createManual("mainMash", RGN_DEFAULT);


// set bounds
    mainMesh->_setBounds(AxisAlignedBox({-100,-100,-100}, {100,100,100}));

    SubMesh* sub1 = mainMesh->createSubMesh();
    sub1->vertexData= new VertexData();
    VertexDeclaration* decl = sub1->vertexData->vertexDeclaration;
    VertexBufferBinding* bind = sub1->vertexData->vertexBufferBinding;
    size_t offset = 0;
    offset += decl->addElement(0, offset, VET_FLOAT3, VES_POSITION).getSize();
    offset += decl->addElement(0, offset, VET_FLOAT3, VES_NORMAL).getSize();
    offset += decl->addElement(0, offset, VET_FLOAT2, VES_TEXTURE_COORDINATES, 0).getSize();
    HardwareVertexBufferSharedPtr vbuf =
            HardwareBufferManager::getSingleton().createVertexBuffer(offset, 4, HBU_GPU_ONLY);
    vbuf->writeData(0, vbuf->getSizeInBytes(), vertices, true);
    bind->setBinding(0, vbuf);

    HardwareIndexBufferSharedPtr ibuf = HardwareBufferManager::getSingleton().createIndexBuffer(
                HardwareIndexBuffer::IT_16BIT, 6, HBU_GPU_ONLY);
    ibuf->writeData(0, ibuf->getSizeInBytes(), faces, true);


    sub1->useSharedVertices = false;
    sub1->indexData->indexBuffer = ibuf;
    sub1->indexData->indexCount = 6;
    sub1->indexData->indexStart = 0;


    sub1->vertexData->vertexCount = 4;
    sub1->vertexData->vertexStart = 0;
    sub1->setMaterialName("color1");


//****

    SubMesh* sub2 = mainMesh->createSubMesh();
    sub2->vertexData= new VertexData();

    VertexDeclaration* decl1 = sub2->vertexData->vertexDeclaration;
    VertexBufferBinding* bind1 = sub2->vertexData->vertexBufferBinding;
    size_t offset1 = 0;
    offset1 += decl1->addElement(0, offset1, VET_FLOAT3, VES_POSITION).getSize();
    offset1 += decl1->addElement(0, offset1, VET_FLOAT3, VES_NORMAL).getSize();
    offset1 += decl1->addElement(0, offset1, VET_FLOAT2, VES_TEXTURE_COORDINATES, 0).getSize();


    HardwareVertexBufferSharedPtr vbuf1 =
            HardwareBufferManager::getSingleton().createVertexBuffer(offset1, 4, HBU_GPU_ONLY);
    vbuf1->writeData(0, vbuf1->getSizeInBytes(), vertices1, true);
    bind1->setBinding(0, vbuf1);

    HardwareIndexBufferSharedPtr ibuf1 = HardwareBufferManager::getSingleton().createIndexBuffer(
                HardwareIndexBuffer::IT_16BIT, 6, HBU_GPU_ONLY);
    ibuf1->writeData(0, ibuf1->getSizeInBytes(), faces1, true);


    sub2->useSharedVertices = false;
    sub2->indexData->indexBuffer = ibuf1;
    sub2->indexData->indexCount = 6;
    sub2->indexData->indexStart = 0;


    sub2->vertexData->vertexCount = 4;
    sub2->vertexData->vertexStart = 0;
    sub2->setMaterialName("color2");

// create an entity
    Entity* meshEntity1 = scnMgr->createEntity("mainMash");
    int size=meshEntity1->getSubEntities().size();

  //   meshEntity1->setMaterialName("Materiale blu");

// attach object
    Ogre::SceneNode* node1 = scnMgr->getRootSceneNode()->createChildSceneNode();
    node1->attachObject(meshEntity1);