Simplygon 10.3.6400.0

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Stand-In: Landscape culling ​

Use landscape culling to remove the parts of the Stand-In mesh that is below the surface.

1. Set up the landscape as a culling geometry ​

Find your landscape actor(s) in the World Outliner and in the details panel, check "Use Landscape for Culling Invisible HLODVertices".

Figure 1: How to enable landscape culling on a landscape actor.
Figure 1: How to enable landscape culling on a landscape actor.

INFO

If you use LandscapeStreamingProxy Actors you need to set this setting on all the proxy actors, not just the parent Landscape.

2. Set pipeline settings ​

Landscape culling is available for both Near- and Far Stand-Ins.

Near Pipeline ​

Set the following settings to enable culling.

  • Aggregation Settings → Enable Geometry Culling = true
  • Geometry Culling Settings → Use Clipping Geometry = true
Figure 2: Near Pipeline settings to enable culling.
Figure 2: Near Pipeline settings to enable culling.

Far Pipeline ​

Set the following setting to enable culling.

  • Geometry Culling Settings → Use Clipping Geometry = true
Figure 3: Far Pipeline settings to enable culling.
Figure 3: Far Pipeline settings to enable culling.

3. (Optional) Set Landscape Culling Precision ​

The landscape geometry can be exported using different precision options. This can be achieved by changing Landscape Culling Precision. The default value is Medium; for tighter clipping (for close up Stand-Ins) this setting can be set to High. Memory footprint and number of computations will increase drastically; use with caution!

Figure 4: Landscape Culling Precision setting.
Figure 4: Landscape Culling Precision setting.

4. Build ​

Build the Stand-In and wait for the process to finish.

5. Result ​

The following images show pre- and post Stand-In generation with landscape culling enabled.

Figure 5: Assets before building of Stand-In.
Figure 5: Assets before building of Stand-In.
Figure 6: Result of Far pipeline with landscape culling enabled.
Figure 6: Result of Far pipeline with landscape culling enabled.