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{{tag>motioncapture democap}}
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[[:start|Start Page]] >> [[main|DEMoCap: Drag[en]gine Motion Capture]] >> **Performance Improvements**
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VR is heavy on the GPU and thus performance problems are common. Following the steps outlined here can help to improve performance.

====== SteamVR Motion Smoothing ======

The biggest problems seems to come from the  use of SteamVR Motion Smoothing feature. This feature is designed to improve the perceived frame rate of games not able to keep up with the required 90Hz frame rate. This causes though wavy and nauseating images in DEMoCap.

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It is highly recommended to <wrap em>disable</wrap> the SteamVR <wrap em>Motion Smoothing</wrap> feature.
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While taking care of the biggest issue these following steps can help improve the performance further

====== Settings Panel ======

<WRAP right :en>{{ :democap:ui_panel_settings.png?direct|Panel Settings}}</WRAP>

The settings panel provides these parameters you can tune.

===== Global Illumination =====

Global Illumination is heavy on the GPU. For motion capture these are usually not required hence you can disable this option in the settings panel. By default this option is disabled. Should this be enabled you can disable it to improve performance. By default this is disabled.

===== Fullbright =====

Enabling fullbright disables all lighting. Instead a constant lighting is used not requiring time consuming calcuations. This is usually the best way to get the highest performance during capturing on weaker systems.

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====== Graphic Module Parameters ======

<WRAP box right :en>{{ :democap:settings.png|Settings Dialog}}<WRAP centeralign>Settings Dialog</WRAP></WRAP>

In the [[democap:uipanelsettings|UI Settings Panel]] click on <wrap em><wrap hi>Module Parameters</wrap></wrap> button.

The module parameters dialog allows to change game engine module parameters. The graphic module parameters are of highest interest here to improve performance.

Once you are done making changes click on <wrap em><wrap hi>Save</wrap></wrap> button to apply the changes. Upon exiting DEMoCap the changes are saved by the launcher and will be restored the next time DEMoCap is run.

===== SSAO =====

SSAO (Screen Space Ambient Occlusion) is a fill rate heavy render effect. In normal game rendering this is not much of a problem. With VR rendering though the fill rate consumption can push less performant cards over the cliffs.

Disable SSAO usually yields the biggest performance improvement hence try disabling this first.

It is recommended to always disable this parameter.

===== VR Render Scale =====

VR Systems indicate to the application the size to render for each eye. Especially for higher resolution HMDs this results in high fill rate which quickly cuts down performance. The OpenGL module supports rendering at lower resolution then upscaling to the requested render size. This causes the image to be of lower quality and makes using the VR menu harder but improves performance a lot. By halving the render size the fill rate drops to 25% which helps a lot.

This parameter supports entering a percentage value in the range from 50(%) to 100(%) in steps of 5(%). Depending on the GPU used switching to 75(%) can be enough to improve performance. For less performant GPU go down to 50(%).

===== GI Quality =====

If Global Illumination (GI) is enabled you can improve the performance by lowering the GI Quality parameter.

This parameters accepts the values "off", "low", "medium", "high" and "veryHigh".

===== Shadow Quality =====

Defines the size of rendered shadow maps. This is usually not a problem unless the GPU is not so strong. You can though lower the quality or disable shadow casting altogether.

This parameters accepts the values "off", "low", "medium", "high" and "veryHigh".

===== SSR =====

SSR (Screen Space Reflection) is another effect which can improve performance if it is disabled. In general though this effect has less impact on performance but if you are in a pinch you can try disabling this effect too.

===== Transparency Layer Limit =====

If you use scenes or characters with lots of transparency this can cause performance issues. Using this parameter you can limit the count of transparent layers rendered. This can causes artifacts if more layers than allowed are required to render each pixel correctly. Still limiting the maximum count of transparent layers rendered can improve the performance.

Using a value of 4 is usually a good value to use. If performance is an issue you can try dropping it down to 2. Going down to 1 is not recommended as this can easily break rendering.
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