Detail this asset from Unity Asset Store: Original Link
This is a paid asset, but we’ll share Pro Material Combiner Free for you. Enjoy!!!
Pro Material Combiner v1.3
This is ProMaterial Combiner. (it does exactly the same that ProMaterialCombiner++ does).
ProMaterialCombiner++ includes:
– Source code.
– Reuse textures to make atlases smaller.
– Batch mode: Combine several objects materials.
ProMaterial Combiner is an editor extension that will combine materials with 1 click. Quick and easy.
Custom shaders?, no worries; the tool works with any shader.
NOTE: If your UVs are outside [0,0-1,1] and you are using textures your combined material will look wrong; make sure your UVs are inside [0,0-1,1] for your objects
NOTES: – UNITY 5, 2018, 2019, 2020+ supported.
– Easy, Just select your object and click combine.
– No scripting required.
– Meshes automatically set up and adjusted.
– Supports any shader (detected automatically).
– Full lightmapping support.
– Your source assets will not be touched.
– Works with colored and textured materials.
– Supports tiled materials.
– Generate prefabs from the combined object.
– Supports skinned mesh renderers.
– Malformed UVs on colored-only materials are organized automatically.
NOTE: In order to combine materials all shaders have to be the same type.
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