C++ TimeSamplingPtr::getFloorIndex方法代码示例

//-*****************************************************************************
void GetRelevantSampleTimes( ProcArgs &args, TimeSamplingPtr timeSampling,
                            size_t numSamples, SampleTimeSet &output )
{
    if ( numSamples < 2 )
    {
        output.insert( 0.0 );
        return;
    }

    chrono_t frameTime = args.frame / args.fps;

    chrono_t shutterOpenTime = ( args.frame + args.shutterOpen ) / args.fps;

    chrono_t shutterCloseTime = ( args.frame + args.shutterClose ) / args.fps;

    std::pair<index_t, chrono_t> shutterOpenFloor =
        timeSampling->getFloorIndex( shutterOpenTime, numSamples );

    std::pair<index_t, chrono_t> shutterCloseCeil =
        timeSampling->getCeilIndex( shutterCloseTime, numSamples );

    //TODO, what's a reasonable episilon?
    static const chrono_t epsilon = 1.0 / 10000.0;

    //check to see if our second sample is really the
    //floor that we want due to floating point slop
    //first make sure that we have at least two samples to work with
    if ( shutterOpenFloor.first < shutterCloseCeil.first )
    {
        //if our open sample is less than open time,
        //look at the next index time
        if ( shutterOpenFloor.second < shutterOpenTime )
        {
            chrono_t nextSampleTime =
                     timeSampling->getSampleTime( shutterOpenFloor.first + 1 );

            if ( fabs( nextSampleTime - shutterOpenTime ) < epsilon )
            {
                shutterOpenFloor.first += 1;
                shutterOpenFloor.second = nextSampleTime;
            }
        }
    }


    for ( index_t i = shutterOpenFloor.first; i < shutterCloseCeil.first; ++i )
    {
        output.insert( timeSampling->getSampleTime( i ) );
    }

    //no samples above? put frame time in there and get out
    if ( output.size() == 0 )
    {
        output.insert( frameTime );
        return;
    }

    chrono_t lastSample = *(output.rbegin() );

    //determine whether we need the extra sample at the end
    if ( ( fabs( lastSample - shutterCloseTime ) > epsilon )
         && lastSample < shutterCloseTime )
    {
        output.insert( shutterCloseCeil.second );
    }
}

AtNode * ProcessPointsBase(
        IPoints & prim, ProcArgs & args,
        SampleTimeSet & sampleTimes,
        std::vector<AtPoint> & vidxs,
		std::vector<float> & radius,
		MatrixSampleMap * xformSamples )
{
    if ( !prim.valid() )
    {
        return NULL;
    }
    
    Alembic::AbcGeom::IPointsSchema  &ps = prim.getSchema();
    TimeSamplingPtr ts = ps.getTimeSampling();
    
	sampleTimes.insert( ts->getFloorIndex(args.frame / args.fps, ps.getNumSamples()).second );
    
    std::string name = args.nameprefix + prim.getFullName();
    
    AtNode * instanceNode = NULL;
    
    std::string cacheId;
    
    SampleTimeSet singleSampleTimes;
    singleSampleTimes.insert( ts->getFloorIndex(args.frame / args.fps, ps.getNumSamples()).second );

	ICompoundProperty arbGeomParams = ps.getArbGeomParams();
	ISampleSelector frameSelector( *singleSampleTimes.begin() );
	std::vector<std::string> tags;

	//get tags
	if ( arbGeomParams != NULL && arbGeomParams.valid() )
	{
		if (arbGeomParams.getPropertyHeader("mtoa_constant_tags") != NULL)
		{
			const PropertyHeader * tagsHeader = arbGeomParams.getPropertyHeader("mtoa_constant_tags");
			if (IStringGeomParam::matches( *tagsHeader ))
			{
				IStringGeomParam param( arbGeomParams,  "mtoa_constant_tags" );
				if ( param.valid() )
				{
					IStringGeomParam::prop_type::sample_ptr_type valueSample =
									param.getExpandedValue( frameSelector ).getVals();

					if ( param.getScope() == kConstantScope || param.getScope() == kUnknownScope)
					{
						Json::Value jtags;
						Json::Reader reader;
						if(reader.parse(valueSample->get()[0], jtags))
							for( Json::ValueIterator itr = jtags.begin() ; itr != jtags.end() ; itr++ )
							{
								tags.push_back(jtags[itr.key().asUInt()].asString());
							}
					}
				}
			}
		}
	}

    if ( args.makeInstance )
    {
        std::ostringstream buffer;
        AbcA::ArraySampleKey sampleKey;
        
        
        for ( SampleTimeSet::iterator I = sampleTimes.begin();
                I != sampleTimes.end(); ++I )
        {
            ISampleSelector sampleSelector( *I );
            ps.getPositionsProperty().getKey(sampleKey, sampleSelector);
            
            buffer << GetRelativeSampleTime( args, (*I) ) << ":";
            sampleKey.digest.print(buffer);
            buffer << ":";
        }
        
        cacheId = buffer.str();
        
        instanceNode = AiNode( "ginstance" );
        AiNodeSetStr( instanceNode, "name", name.c_str() );
		args.createdNodes.push_back(instanceNode);

        if ( args.proceduralNode )
        {
            AiNodeSetByte( instanceNode, "visibility",
                    AiNodeGetByte( args.proceduralNode, "visibility" ) );
        
        }
        else
        {
            AiNodeSetByte( instanceNode, "visibility", AI_RAY_ALL );
        }

		ApplyTransformation( instanceNode, xformSamples, args );

		NodeCache::iterator I = g_meshCache.find(cacheId);

		// parameters overrides
		if(args.linkOverride)
			ApplyOverrides(name, instanceNode, tags, args);
//.........这里部分代码省略.........