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Fast version of perlin noise.

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This commit is contained in:
David Williams
2011-02-07 22:07:47 +00:00
parent 23a56ed000
commit 42db69e013
4 changed files with 96 additions and 33 deletions
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58
examples/Basic/main.cpp
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@ -343,7 +343,7 @@ Perlin::Perlin(int octaves,float freq,float amp,int seed)
mStart = true;
}
void createPerlinVolume(Volume<MaterialDensityPair44>& volData)
void createPerlinVolumeSlow(Volume<MaterialDensityPair44>& volData)
{
Perlin perlin(2,8,1,234);
@ -374,6 +374,54 @@ void createPerlinVolume(Volume<MaterialDensityPair44>& volData)
}
}
void createPerlinVolumeFast(Volume<MaterialDensityPair44>& volData)
{
Perlin perlin(2,8,1,234);
for(int blockZ = 0; blockZ < volData.m_uDepthInBlocks; blockZ++)
{
std::cout << blockZ << std::endl;
for(int blockY = 0; blockY < volData.m_uHeightInBlocks; blockY++)
{
for(int blockX = 0; blockX < volData.m_uWidthInBlocks; blockX++)
{
for(int offsetz = 0; offsetz < volData.m_uBlockSideLength; offsetz++)
{
for(int offsety = 0; offsety < volData.m_uBlockSideLength; offsety++)
{
for(int offsetx = 0; offsetx < volData.m_uBlockSideLength; offsetx++)
{
int x = blockX * volData.m_uBlockSideLength + offsetx;
int y = blockY * volData.m_uBlockSideLength + offsety;
int z = blockZ * volData.m_uBlockSideLength + offsetz;
if((x == 0) || (x == volData.getWidth()-1)) continue;
if((y == 0) || (y == volData.getHeight()-1)) continue;
if((z == 0) || (z == volData.getDepth()-1)) continue;
float perlinVal = perlin.Get3D(x /static_cast<float>(volData.getWidth()-1), (y) / static_cast<float>(volData.getHeight()-1), z / static_cast<float>(volData.getDepth()-1));
MaterialDensityPair44 voxel;
if(perlinVal < 0.0f)
{
voxel.setMaterial(245);
voxel.setDensity(MaterialDensityPair44::getMaxDensity());
}
else
{
voxel.setMaterial(0);
voxel.setDensity(MaterialDensityPair44::getMinDensity());
}
volData.setVoxelAt(x, y, z, voxel);
}
}
}
}
}
}
}
void createSphereInVolume(Volume<MaterialDensityPair44>& volData, Vector3DFloat v3dVolCenter, float fRadius)
{
//This vector hold the position of the center of the volume
@ -421,9 +469,9 @@ int main(int argc, char *argv[])
openGLWidget.show();
//Create an empty volume and then place a sphere in it
Volume<MaterialDensityPair44> volData(128, 128, 128);
Volume<MaterialDensityPair44> volData(1024, 1024, 1024);
//createSphereInVolume(volData, 30);
createPerlinVolume(volData);
createPerlinVolumeFast(volData);
/*srand(12345);
for(int ct = 0; ct < 1000; ct++)
@ -439,12 +487,12 @@ int main(int argc, char *argv[])
}*/
//Extract the surface
SurfaceMesh<PositionMaterialNormal> mesh;
/*SurfaceMesh<PositionMaterialNormal> mesh;
CubicSurfaceExtractorWithNormals<MaterialDensityPair44> surfaceExtractor(&volData, volData.getEnclosingRegion(), &mesh);
surfaceExtractor.execute();
//Pass the surface to the OpenGL window
openGLWidget.setSurfaceMeshToRender(mesh);
openGLWidget.setSurfaceMeshToRender(mesh);*/
//Run the message pump.
return app.exec();