Version: 2020.3
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ModelImporter.isReadable

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public bool isReadable;

Description

Are mesh vertices and indices accessible from script?

Making a mesh readable will keep two copies of it in memory, one for rendering and one in system memory for script access. Setting isReadable to false therefore saves memory. Scaling a mesh with different amounts along the three axes (i.e. non-uniform scaling) requires the mesh to be readable for correct lighting.

In the Unity editor access is always permitted when not in play mode.