Method hash

src/IECoreScene/SceneCache.cpp:676–765

		}

		void hash( HashType hashType, double time, MurmurHash &h, bool ignoreSceneHash = false ) const
		{
			size_t s0, s1;
			double x;

			h.append( (unsigned char)hashType );

			// all kinds of hashes, except the child names depend on time.
			switch( hashType )
			{
				case TransformHash:

					if ( m_indexedIO->hasEntry( transformEntry ) )
					{
						x = transformSampleInterval( time, s0, s1 );
						h.append( lerp( (double)s0, (double)s1, x ) );
					}
					else
					{
						// return a simple hash for the identity transform (which does not include the scene location).
						return;
					}
					break;

				case AttributesHash:
					{
						NameList attrs;
						attributeNames( attrs );
						if ( !attrs.size() )
						{
							// return a simple hash for no attributes (which does not include the scene location).
							return;
						}
						for ( NameList::const_iterator aIt = attrs.begin(); aIt != attrs.end(); aIt++ )
						{
							x = attributeSampleInterval( *aIt, time, s0, s1 );
							h.append( lerp( (double)s0, (double)s1, x ) );
						}
					}
					break;

				case BoundHash:

					x = boundSampleInterval( time, s0, s1 );
					h.append( lerp( (double)s0, (double)s1, x ) );
					break;

				case ObjectHash:

					if ( m_indexedIO->hasEntry( objectEntry ) )
					{
						x = objectSampleInterval( time, s0, s1 );
						h.append( lerp( (double)s0, (double)s1, x ) );
					}
					else
					{
						// return a simple hash for no object (which does not include the scene location).
						return;