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POReading in a BMP Heightmap
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  1. POReading in a BMP Heightmap
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    copied!<p>I am trying to load in a height map using C++ with DirectX. As a test I created a BMP file that is all black, so the terrain should be flat. Part of the edge is not flat though. Can anyone tell me why?</p> <pre><code>BITMAPFILEHEADER bitmapFileHeader; BITMAPINFOHEADER bitmapInfoHeader; ifstream bitmapFile("heightMap.bmp", ios::binary); if (!bitmapFile) return; // Read in file header. bitmapFile.read((char*)&amp;bitmapFileHeader, sizeof(BITMAPFILEHEADER)); // Read in the bitmap info header. bitmapFile.read((char*)&amp;bitmapInfoHeader, sizeof(BITMAPINFOHEADER)); int width = bitmapInfoHeader.biWidth; int height = bitmapInfoHeader.biHeight; unsigned char* bitmapImage = new unsigned char[width * height * 3]; bitmapFile.seekg(bitmapFileHeader.bfOffBits, ios::beg); // Store the image data. bitmapFile.read((char*)bitmapImage, width * height * 3); int numCellsWide = 200; int numCellsHigh = 200; int numVerticesWide = numCellsWide + 1; int numVerticesHigh = numCellsHigh + 1; numberVertices = (numCellsWide + 1) * (numCellsHigh + 1); numberTriangles = numCellsWide * numCellsHigh * 2; int cellWidth = 1; int cellHeight = 1; // Create the terrain vertices. Vertex* vertices = new Vertex[numberVertices]; int k = 0; for (int z = 0; z &lt; numVerticesHigh; z++) { for (int x = 0; x &lt; numVerticesWide; x++) { int index = z * numVerticesWide + x; vertices[index].x = x * cellWidth; vertices[index].y = (float)bitmapImage[k]; vertices[index].z = z * cellHeight; vertices[index].tu = vertices[index].x / (numCellsWide * cellWidth); vertices[index].tv = vertices[index].z / (numCellsHigh * cellHeight); k += 3; } } </code></pre>
 

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