Temporarily hack out shader prefixing ( it seems incompatible with USDView? )

Author: danieldresser-ie

contrib/IECoreUSD/src/IECoreUSD/ShaderAlgo.cpp

@@ -206,6 +206,7 @@ IECore::InternedString readShaderNetworkWalk( const pxr::SdfPath &anchorPath, co
 			{
 				prefix = "ai";
 			}
+
 			shaderType = prefix + ":shader";
 		}
 		shaderName = name;
@@ -311,15 +312,15 @@ pxr::UsdShadeConnectableAPI createShaderPrim( const IECoreScene::Shader *shader,
 	}
 	const std::string type = shader->getType();
 	std::string typePrefix;
-	size_t typeColonPos = type.find( ":" );
+	/*size_t typeColonPos = type.find( ":" );
 	if( typeColonPos != std::string::npos )
 	{
 		typePrefix = type.substr( 0, typeColonPos ) + ":";
 		if( typePrefix == "ai:" )
 		{
 			typePrefix = "arnold:";
 		}
-	}
+	}*/
 	usdShader.SetShaderId( pxr::TfToken( typePrefix + shader->getName() ) );
 
 	return usdShader.ConnectableAPI();