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Creating and managing animated grass for MGE-XE and OpenMW

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Groundcover

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Vurt’s Groundcover, the most downloaded and endorsed Morrowind groundcover mod on Nexus Mods.
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This article is part of a series on Groundcover

• Generating Groundcover
• The LawnMower
• MeshGen
• Habasi
• Groundcoverify
• Lawnmower Groundcover Tutorial

Both MGE-XE and OpenMW support animated, instanced grass called groundcover.

Groundcover allows the rendering of hundreds of grass meshes per cell at low performance cost. In addition, these meshes are animated to simulate blowing in the wind (‘grass-swaying’) and will deform as if pushed aside when colliding with the player (‘grass-stomping’). To achieve this, mods adding groundcover must be handled differently from regular plugins.

Whilst each game engine differs in their exact handling of groundcover, the same general principles above apply in both.

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• Contrary to popular belief, groundcover plugins can ESM files in both MGE-XE¹ and OpenMW², and other groundcover plugins can depend on and modify these masters just like regular plugins and master files.
• Best documentation on how MGE-XE groundcover works ironically comes from OpenMW devs.³