void WriteSetAtIndexHLSL ( const [FNiagaraDataInterfaceGPUParamInfo](API\Plugins\NiagaraShader\FNiagaraDataInterfaceGPUParamInf-) & ParamInfo, const [FNiagaraDataInterfaceGeneratedFunction](API\Plugins\NiagaraShader\FNiagaraDataInterfaceGeneratedFu-) & FunctionInfo, int32 InNumChannels, [FString](API\Runtime\Core\Containers\FString) & OutHLSL )