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Using the Proxy Geometry tool with HLOD

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In the following How - To we, will take a look at using the Proxy Geometry Tool in conjunction with the Hierarchical Level of Detail (HLOD) system. Using these two tools together will help increase your Unreal Engine 4 (UE4) projects rendering performance by reducing both draw calls and number of triangles drawn to the screen per frame.

Steps

  1. First, go to your project's World Settings  and expose the LODSystem menu option. 
    Proxy_Geo_HT_WHLOD_01.png

  2. In the LODSystem menu, enable the following two options: 
    Proxy_Geo_HT_WHLOD_02.png

    Property Name

    Description

    Enable Hierarchical LOD System

    Enables the HLOD to be used with this level.

    Simplify Mesh

    Enables Proxy Geometry Static Mesh simplification.

  3. Open up the Hierarchical LOD Outliner tools by going to Window > Hierarchical LOD Outliner. Proxy_Geo_HT_WHLOD_03.png5. Press the Generate Clusters button on the Hierarchical LOD Outliner and when that is completed, press the Generate Proxy Meshes button to begin the HLOD and Proxy Geometry creation process.
    Proxy_Geo_HT_WHLOD_04.png

End Result

When the Hierachical LOD tool has finished processing you can see how many triangles where removed and also compare the results against the original by moving the slider back and forth.

  ![](Proxy_Geo_HT_WHLOD_05.png "Proxy_Geo_HT_WHLOD_05.png")

The image comparison slider below shows an example of the types of results you can get when using just the default settings with Simplify Mesh enabled.

Before Running HLOD & Proxy Geo

After Running HLOD & Proxy Geo