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CloseAre 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.
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