UniMeshCombiner is the plugin of Unity that combine model mesh per material.
Unity 2018 or higher
- Select Windo -> UniMeshCombiner to open UniMeshCombiner window
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Set combine target object to Combine Target Filed
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Check Export Mesh Toggle and Select Directory if you want to export Mesh assets
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Press Combie Button!
use unitypackage at release page
The great car model from Unity Asset Store