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POCreating manual mesh in Ogre3d?
 

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  1. POCreating manual mesh in Ogre3d?
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    <p>I am getting a bit confused as to why my manually created mesh is not appearing correctly. I have created the vertex and index buffers and they seem (although I am not 100% sure) to contain the correct values.</p> <p>Essentially I am creating a grid of mapSize * mapSize vetrices, at a height of 0, then creating the triangles out of them.</p> <pre><code>void TerrainGeneration::createTerrainMesh() { /// Create the mesh via the MeshManager Ogre::MeshPtr msh = Ogre::MeshManager::getSingleton().createManual("TerrainTest", "General"); Ogre::SubMesh* sub = msh-&gt;createSubMesh(); const size_t nVertices = mapSize*mapSize; const size_t vbufCount = 3*2*nVertices; float vertices[vbufCount]; size_t vBufCounter = 0; for(int z = 0; z &lt; mapSize; z++) { for(int x = 0; x &lt; mapSize; x++) { //Position vertices[vBufCounter] = x; vertices[vBufCounter+1] = 0; vertices[vBufCounter+2] = z; //Normal vertices[vBufCounter+3] = 0; vertices[vBufCounter+4] = 1; vertices[vBufCounter+5] = 0; vBufCounter += 6; } } Ogre::RenderSystem* rs = Ogre::Root::getSingleton().getRenderSystem(); Ogre::RGBA colours[nVertices]; Ogre::RGBA *pColour = colours; //Create triangles const size_t ibufCount = 6*(mapSize - 1)*(mapSize - 1); unsigned int faces[ibufCount]; size_t iBufCounter = 0; for(int x=0; x &lt;= mapSize -2; x++) { for(int y=0; y &lt;= mapSize -2; y++) { faces[iBufCounter] = vertices[(y*mapSize) + x]; faces[iBufCounter+1] = vertices[((y+1)*mapSize) + x]; faces[iBufCounter+2] = vertices[((y+1)*mapSize) + (x+1)]; faces[iBufCounter+3] = vertices[(y*mapSize) + x]; faces[iBufCounter+4] = vertices[((y+1)*mapSize) + (x+1)]; faces[iBufCounter+5] = vertices[(y*mapSize) + (x+1)]; iBufCounter += 6; } } /// Create vertex data structure for n*n vertices shared between submeshes msh-&gt;sharedVertexData = new Ogre::VertexData(); msh-&gt;sharedVertexData-&gt;vertexCount = nVertices; /// Create declaration (memory format) of vertex data Ogre::VertexDeclaration* decl = msh-&gt;sharedVertexData-&gt;vertexDeclaration; size_t offset = 0; // 1st buffer decl-&gt;addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION); offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3); decl-&gt;addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_NORMAL); offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3); /// Allocate vertex buffer of the requested number of vertices (vertexCount) /// and bytes per vertex (offset) Ogre::HardwareVertexBufferSharedPtr vbuf = Ogre::HardwareBufferManager::getSingleton().createVertexBuffer( offset, msh-&gt;sharedVertexData-&gt;vertexCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY); /// Upload the vertex data to the card vbuf-&gt;writeData(0, vbuf-&gt;getSizeInBytes(), vertices, true); /// Set vertex buffer binding so buffer 0 is bound to our vertex buffer Ogre::VertexBufferBinding* bind = msh-&gt;sharedVertexData-&gt;vertexBufferBinding; bind-&gt;setBinding(0, vbuf); /// Allocate index buffer of the requested number of vertices (ibufCount) Ogre::HardwareIndexBufferSharedPtr ibuf = Ogre::HardwareBufferManager::getSingleton(). createIndexBuffer( Ogre::HardwareIndexBuffer::IT_16BIT, ibufCount, Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY); /// Upload the index data to the card ibuf-&gt;writeData(0, ibuf-&gt;getSizeInBytes(), faces, true); /// Set parameters of the submesh sub-&gt;useSharedVertices = true; sub-&gt;indexData-&gt;indexBuffer = ibuf; sub-&gt;indexData-&gt;indexCount = ibufCount; sub-&gt;indexData-&gt;indexStart = 0; /// Set bounding information (for culling) msh-&gt;_setBounds(Ogre::AxisAlignedBox(-5000,-5000,-5000,5000,5000,5000)); //msh-&gt;_setBoundingSphereRadius(Ogre::Math::Sqrt(3*100*100)); /// Notify -Mesh object that it has been loaded msh-&gt;load(); } </code></pre> <p>I initialise the mesh and load it as follows </p> <pre><code>Ogre::Entity* thisEntity = mSceneMgr-&gt;createEntity("cc", "TerrainTest", "General"); thisEntity-&gt;setMaterialName("Examples/Rockwall"); Ogre::SceneNode* thisSceneNode = mSceneMgr-&gt;getRootSceneNode()-&gt;createChildSceneNode(); thisSceneNode-&gt;setPosition(0, 0, 0); thisSceneNode-&gt;attachObject(thisEntity); </code></pre> <p>Any insight would be greatly appreciated.</p>
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    1. USJon Taylor
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      1. POCreating manual mesh in Ogre3d?
      1. USXavier
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    1. COI can't speak directly to your question, but here's a thought: Does your mesh get all the triangle orientations correct? Input triangle ABC where triangle BAC was needed, and you can confuse many mesh engines.
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      1. USManagu
    2. COYeah I believe my triangles are correct, Ogre requires anti clockwise selection of vertices for a face. I have tried clockwise too, just incase. The problem seems to be that the vertices are not being spread out as I would expect but im not really sure why.
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      1. POCreating manual mesh in Ogre3d?
      1. USJon Taylor
 

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