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CextensionManager* extensionManager = CextensionManager::instance();
CgeometryProceduralExtension* geomProcExtension = extensionManager->createGeometryProceduralExtension( "MaxwellParticles" );
//Get the extension container. When using this method of getting the container,
//nearly all parameters have default values, and there is no need to explicitly set them.
MXparamList* particlesParams = geomProcExtension->getExtensionData();

//Fill the required data
char* filename = "/home/rocco/Emitter01_00023.bin";
particlesParams->setString( "FileName", filename );

//Enable loading particle densities data
byte load = 1;
particlesParams->setByte( "Load particle Density", load );

//These two numbers can be obtained parsing the particles file
float minD = 0.19;
float maxD = 1.67;
particlesParams->setFloat( "Min Density", minD );
particlesParams->setFloat( "Max Density", maxD );

//Get the number of custom generators available
byte numCustomUVGenerators = geomProcPlugin->getNumberOfUVGenerators();
Cmaxwell::Cobject obj = scene->createGeometryProceduralObject( "My Particles", particlesParams );

dword uvIndex;//returned uv channel index. Use this index in the texture map properties to access its uv's
byte isOk = obj.addChannelUVW( uvIndex );
obj.generateCustomUVW( uvIndex, 34 );//34 is the type of the custom uv generator.