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POHow to use perlin.getValue() to generate 3D heightmaps in Libnoise?
 

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  1. POHow to use perlin.getValue() to generate 3D heightmaps in Libnoise?
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    <p>I have been using the dotnet port of Libnoise to generate some heighmaps in XNA using the following code:</p> <pre><code>ImprovedPerlin perlin = new ImprovedPerlin(seed, NoiseQuality.Standard); FilterModule module = new SumFractal(); module.Frequency = 0.2f; module.OctaveCount = 6; module.Lacunarity = 2; module.Gain = 2; module.Offset = 1; module.SpectralExponent = 0.9f; module.Primitive3D = perlin; float bound = 10f; NoiseMapBuilderPlane builder = new NoiseMapBuilderPlane( 6.0f + mapX, 10.0f + mapX, 1.0f + mapZ, 5.0f + mapZ, true); //bound + mapx, (bound + mapX) * 2, bound, bound * 2, true); NoiseMap noiseMap = new NoiseMap(128, 128); builder.SetSize(128, 128); builder.SourceModule = module; builder.NoiseMap = noiseMap; builder.Build(); Graphics.Tools.Noise.Renderer.GradientColor gradient = Graphics.Tools.Noise.Renderer.GradientColor.GRAYSCALE; Color[] colorData = new Color[128 * 128]; texture = new Texture2D(AssetManager.graphicsDeviceManager.GraphicsDevice, 128, 128); for (int y = 0; y &lt; 128; ++y) { for (int x = 0; x &lt; 128; ++x) { byte color = gradient.GetColor(noiseMap.GetValue(x, y)).Green; } } texture.SetData&lt;Color&gt;(colorData); </code></pre> <p>This all works fine, even if I get different results in the provided libnoise sample that doesn't use XNA (I neeed to lower the frequancy to get the same result in XNA for some reason).</p> <p>Sadly there is no NoiseBuilder[3D] to generate a 3D variant of noise, so I have to build it myself using the perlin function. But even trying to generate 2D noise using perlin.getValue() seems to end up wrong;</p> <pre><code>float px = 0; float py = 0; for (int y = 0; y &lt; 128; ++y) { py += 0.1f; for (int x = 0; x &lt; 128; ++x) { px += 0.1f; int color = (int)((perlin.GetValue(px, py, 0) + 1) * 177.5f); } } texture.SetData &lt; Color &gt; (colorData); </code></pre> <p><img src="https://i.stack.imgur.com/nu3RY.png" alt="left = perlin.getValue(), right = mage 2 = NoiseMapBuilderPlane"></p> <p>I have no idea how to incorporate the SumFractal aswell, but that's a worry for later I guess.</p>
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    1. COCheck out this other question: http://stackoverflow.com/questions/6963388/fastest-perlin-like-3d-noise-algorithm
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      1. POHow to use perlin.getValue() to generate 3D heightmaps in Libnoise?
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    2. COI actually understand how perlin noise works behind the screens, I'm just not sure how to actually generate a proper heightmap use individual "getValue()" calls
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