> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to import topology optimization results from Altair Optistruct® into nTop

## Objective:

Learn how to import Topology Optimization results from Altair Optistruct into nToplogy.

## Applies to:

* Simulation
* Analysis
* Altair Optistruct

## Procedure:

Importing topology optimization results into nTop requires setting a few parameters before your analysis in Altair Optistruct®. To make the required changes and import the results into nTop do the following:

**1.** Open your Altair Optistruct® analysis.

**2.** In the panel on the bottom right of the screen, select **Analysis.**

**3.** Select **Control Card.**

**4.** Find and enable the **OUTPUT card.**

**5.** In the **OUTPUT card** in your tree set **OUTPUT1 to SHRES**, and **OUTPUT2 to OP2.**

![The Analysis screen in Altair Optistruct.](https://files.learn.ntop.com/help-articles/interop/1500000165321.png)

**6.** With these changes made, you can now run the analysis in Altair Optistruct® and it will result in an OP2 file.

Inside nTop use the **Import Topology Optimization Results** block.

**7.** Add an **Import Topology Optimization Results** (if you don't have beta blocks turned on, [go here](/help-articles/knowledge-base/user-interface/what-are-beta-blocks)).

**8.** In the first input specify the **path** to the OP2 file that was generated by Altair Optistruct®.

**9.** In the second input specify the **unit system** used within Altair Optistruct®.

**10.** After loading you can now use the results just like nTop native topology optimization results.

And that's it! You've successfully imported your results into nTop.

*Optistruct® is the trademark of Altair Engineering, Inc.*

Are you still having issues? Contact the [support team](https://support.ntopology.com/hc/en-us/requests/new), and we'll be happy to help!

## Keywords:

*import topology results from optimization importing altair optistruct*