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Added support for reading raw data and transfer function from a volume header

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This commit is contained in:
Robert Osfield 2008-09-22 17:24:26 +00:00
parent 65cb2e625f
commit 55d4756d31
1 changed files with 56 additions and 0 deletions
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56
examples/osgvolume/osgvolume.cpp
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@ -1689,6 +1689,62 @@ int main( int argc, char **argv )
while(arguments.read("--shader")) { useShader = true; }
osg::ref_ptr<osg::Image> image_3d;
std::string vh_filename;
while (arguments.read("--vh", vh_filename))
{
std::string raw_filename, transfer_filename;
int xdim(0), ydim(0), zdim(0);
std::ifstream header(vh_filename.c_str());
if (header)
{
header >> raw_filename >> transfer_filename >> xdim >> ydim >> zdim >> xSize >> ySize >> zSize;
}
if (xdim*ydim*zdim==0)
{
std::cout<<"Error in reading volume header "<<vh_filename<<std::endl;
return 1;
}
if (!raw_filename.empty())
{
image_3d = readRaw(xdim, ydim, zdim, 1, 1, "little", raw_filename);
}
if (!transfer_filename.empty())
{
std::ifstream fin(transfer_filename.c_str());
if (fin)
{
osg::TransferFunction1D::ValueMap valueMap;
float value = 0.0;
while(fin && value<1.0)
{
float red, green, blue, alpha;
fin >> red >> green >> blue >> alpha;
if (fin)
{
std::cout<<"value = "<<value<<" ("<<red<<", "<<green<<", "<<blue<<", "<<alpha<<")"<<std::endl;
valueMap[value] = osg::Vec4(red/255.0+0.5,green/255.0+0.5,blue/255.0+0.5,alpha/255.0+0.5);
}
value += 1/255.0;
}
if (valueMap.empty())
{
std::cout<<"Error: No values read from transfer function file: "<<transfer_filename<<std::endl;
return 0;
}
transferFunction = new osg::TransferFunction1D;
transferFunction->assign(valueMap, true);
}
}
}
int sizeX, sizeY, sizeZ, numberBytesPerComponent, numberOfComponents;
std::string endian, raw_filename;