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Improved comments and interface of perlin noise color

This commit is contained in:
Paolo Cignoni 2012-10-19 12:32:05 +00:00
parent 1918c53a09
commit 75122cd193
2 changed files with 17 additions and 10 deletions
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8
apps/sample/trimesh_color/trimesh_color.cpp
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@ -52,13 +52,15 @@ int main(int argc, char **argv)
{
MyMesh m;
vcg::tri::io::ImporterPLY<MyMesh>::Open(m,"../../meshes/torus_irregular.ply");
vcg::tri::UpdateColor<MyMesh>::PerVertexConstant(m, vcg::Color4b::LightGray);
vcg::tri::UpdateColor<MyMesh>::PerFaceConstant(m, vcg::Color4b::LightGray);
vcg::tri::UpdateColor<MyMesh>::PerVertexPerlinNoise(m, vcg::Color4b::LightGray);
vcg::tri::UpdateColor<MyMesh>::PerFaceFromVertex(m, vcg::Color4b::LightGray);
vcg::tri::UpdateColor<MyMesh>::PerVertexPerlinNoise(m,vcg::Point3f(0.5,0.75,1.0));
vcg::tri::UpdateColor<MyMesh>::PerFaceFromVertex(m);
vcg::tri::io::ExporterPLY<MyMesh>::Save(m,argv[2]);
vcg::tri::io::ExporterPLY<MyMesh>::Save(m,"out.ply",vcg::tri::io::Mask::IOM_FACECOLOR+vcg::tri::io::Mask::IOM_VERTCOLOR);
return 0;
}

19
vcg/complex/algorithms/update/color.h
View File

@ -309,18 +309,23 @@ Note: The faux bit is used to color polygonal faces uniformly
/*! \brief Perlin Noise.
\return the number of changed vertexes (the selected ones)
Simple Perlin noise. To make things weirder each color band can be offset.
Simple Perlin noise. To make things weirder each color band can have its own offset and frequency.
Period is expressed in absolute terms.
So as period it is meaningful could be to use something in the range of 1/10 of the bbox diag.
*/
static void PerVertexPerlinNoise(MeshType& m, Box3f bbox, Matrix44<ScalarType> tr, float freq, Point3i channelOffsets=Point3i(0,0,0))
static void PerVertexPerlinNoise(MeshType& m, Point3f period, Point3f offset=Point3f(0,0,0))
{
Point3<ScalarType> p;
Point3<ScalarType> p[3];
for(VertexIterator vi = m.vert.begin(); vi!=m.vert.end(); ++vi)
{
if(!(*vi).IsD()){
p = bbox.GlobalToLocal(tr * (*vi).P()); //actual vertex position scaled to bbox
(*vi).C() = Color4b( int(255*math::Perlin::Noise(channelOffsets[0]+p[0]*freq,channelOffsets[0]+p[1]*freq,channelOffsets[0]+p[2]*freq)),
int(255*math::Perlin::Noise(channelOffsets[1]+p[0]*freq,channelOffsets[1]+p[1]*freq,channelOffsets[1]+p[2]*freq)),
int(255*math::Perlin::Noise(channelOffsets[2]+p[0]*freq,channelOffsets[2]+p[1]*freq,channelOffsets[2]+p[2]*freq)),
// perlin noise is defined in 022
p[0] = (vi->P()/period[0])+offset;
p[1] = (vi->P()/period[1])+offset;
p[2] = (vi->P()/period[2])+offset;
(*vi).C() = Color4b( int(127+128.0*math::Perlin::Noise(p[0][0],p[0][1],p[0][2])),
int(127+128.0*math::Perlin::Noise(p[1][0],p[1][1],p[1][2])),
int(127+128.0*math::Perlin::Noise(p[2][0],p[2][1],p[2][2])),
255 );
}
}