ROAM with DX9
Author
I''m trying to implement a ROAMing-terrain for DX9.
I can code the basics like bintrees etc. even in my dreams
but how the fuck am I supposed to create an indexbuffer for my tree?
I couldn''t even get bruteforce-terrain indexbuffer to work when I tried it.. best result I got was some flashing triangles on the edge of the screen..
Well, I suggest you figure out how to use index buffers for the simple case before you try using them on the complicated cases.
Author
I thought I finally understood it.. but then not.
I'm using triangle-lists instead of strips because I really want to implement a roam terrain.. I dont think one could use strips with triangle-bintrees without alot of effort..
help me out with this : (mostly modified from some of tutorials online)
Create terrain:
Create vertex buffer:
Create index buffer:
Render:
.. this only produces some flashing triangles on the edges of the screen.. I also checked return values from render. all ok.
[edited by - Pothead on September 1, 2003 6:05:35 AM]
I'm using triangle-lists instead of strips because I really want to implement a roam terrain.. I dont think one could use strips with triangle-bintrees without alot of effort..
help me out with this : (mostly modified from some of tutorials online)
Create terrain:
HRESULT CTerrain::Create( const string &filename, LPDIRECT3DDEVICE9 ToRenderer ){ // template result for calls. HRESULT hr; // if no rendering device, vertex&index buffers cannot be initialized if(!ToRenderer) return D3DAPPERR_NODIRECT3D; Renderer = ToRenderer; //bitmap-object for loading and processing heightmap-data bmpHeightMap = new Graphics::TBitmap(); bmpHeightMap->LoadFromFile( filename.c_str() ); //get bitmap width & height MapWidth = bmpHeightMap->Width; MapHeight = bmpHeightMap->Height; m_iTotalNumOfVertices = MapWidth * MapHeight; // Create vertex-buffer hr = Renderer->CreateVertexBuffer ( m_iTotalNumOfVertices*sizeof(TerrainVertex), 0, D3DFVF_TERRAINVERTEX, D3DPOOL_DEFAULT, &TerrainVertexBuffer, NULL ); if (FAILED(hr)) return hr; // Next fill vertex buffer with x,y,z data from heightmap.. hr=FeedVertexBuffer(); //Create index-buffer hr=CreateTerrainIndexBuffer(); if (FAILED(hr)) return hr; return S_OK;}Create vertex buffer:
HRESULT CTerrain::FeedVertexBuffer(){ if( FAILED( TerrainVertexBuffer->Lock( 0, 0, (VOID**)&pVertices,0 ) ) ) return E_FAIL; TerrainVertex* pVertex; int iVertexBuffOffset = 0; int terrScale = 4; // <- set to some parameter.. !!!!!!!!!!!!!!!!!!!!!!! TODO !!!!!!!!!!!!!!!!!!!!!!!! for (int z = 0; z < MapHeight; z++) //vertical rows { for (int x = 0; x < MapWidth; x++) //horizontal rows { pVertex = &( pVertices[ iVertexBuffOffset ] ); pVertex->x = (float)x * terrScale; pVertex->z = (float)z * terrScale; // Load height for this vertex from a pixel RGB value pVertex->y = (float)((bmpHeightMap->Canvas->Pixels[z][x]>>16) / 2.0f)-128.0f; // TODO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! <-set to some param!!!!!!! iVertexBuffOffset++; } } TerrainVertexBuffer->Unlock(); return S_OK;}Create index buffer:
HRESULT CTerrain::CreateTerrainIndexBuffer(){ WORD* pIndexData; m_iTotalNumOfPrimitives = (MapHeight-1)*(MapWidth-1)*2; Renderer->CreateIndexBuffer(sizeof(WORD) * m_iTotalNumOfPrimitives * 3,D3DUSAGE_WRITEONLY, D3DFMT_INDEX16,D3DPOOL_DEFAULT,&TerrainIndexBuffer,NULL); TerrainIndexBuffer->Lock(0,0,(void**)&pIndexData,0); for(WORD y = 0;y < MapHeight-1;++y) { for(WORD x = 0;x < MapWidth-1;++x) { *pIndexData++ = x + y * (MapWidth); *pIndexData++ = x + 1 + y * (MapWidth); *pIndexData++ = x + 1 + (y + 1) * (MapWidth); *pIndexData++ = x + y * (MapWidth); *pIndexData++ = x + 1 + (y + 1) * (MapWidth); *pIndexData++ = x + (y + 1) * (MapWidth); } } TerrainIndexBuffer->Unlock(); return S_OK;}Render:
HRESULT CTerrain::Render(){ if(!Renderer) return D3DAPPERR_NODIRECT3D; Renderer->SetIndices( TerrainIndexBuffer ); Renderer->SetStreamSource( 0, TerrainVertexBuffer, 0, sizeof(TerrainVertex) ); Renderer->SetFVF( D3DFVF_TERRAINVERTEX ); Renderer->DrawIndexedPrimitive( D3DPT_TRIANGLELIST , 0,0, m_iTotalNumOfVertices, 0, m_iTotalNumOfPrimitives); return S_OK;}.. this only produces some flashing triangles on the edges of the screen.. I also checked return values from render. all ok.
[edited by - Pothead on September 1, 2003 6:05:35 AM]
Did you set the world and view and projection matrices?
This is most probable because flashing triangles mostly appears if not valid matrices set
Also did you set a material?
This is most probable because flashing triangles mostly appears if not valid matrices set
Also did you set a material?
Author
all matrices are set properly and everything else renders fine. I also tried using a material for mi landscape. no luck.
I''ve been reading those vertex&index buffer creations over&over again and I''ve gone completely blind of my own code. there must be something trivial I''m missing every time. please help.
I''ve been reading those vertex&index buffer creations over&over again and I''ve gone completely blind of my own code. there must be something trivial I''m missing every time. please help.
The index buffer filling is true.
You use 16bit index buffer which can only handle 65536 vertices.
Your terrain size cannot be more than 255*255 if square.
You use 16bit index buffer which can only handle 65536 vertices.
Your terrain size cannot be more than 255*255 if square.
Author
yes, I know the 16bit limit and I''m testing it with 64x64 map..
what the hell could be the problem?
what the hell could be the problem?
Author
I''ve been debugging my terrain.cpp for 2days and the actual bug was in skydome.cpp (not restoring all renderstates the way they should have been..)
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