Blender – quickly clearing multi-materials

Software:
Blender 2.79

Select one or more objects with multiple materials and another object with just one material as the active object, that will be the Active Object.
In the material list open the v menu and choose ‘Copy Material to Others’
This will copy the material settings to all selected objects.

* Link materials command will not achieve the result, it will still keep unneeded materials on selected objects

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Enable the built in addon: ‘Material Utils Specials’

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This addon will add three extra material operations to the material V menu:

Clean Material Slots:
Deletes unused material from the object

Remove Active Slot:
Same as deleting a material by pressing –

Remove all Slots:
Delete all materials assigned to the object

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Daylight system for Blender

Software:
Blender 2.78

Found a simple and effective sun positioning addon for Blender,
It can be downloaded here:
https://developer.blender.org/F20492
The addon is easy to install like all other addons in Blender,
Once installed you will find it’s controls in the World settings,
You specify a sky environment map and a sun node and it will control them acording to given latitude longitude, date, timezone ect.
Also lets you set the north direction of the system as needed.

Very simple and very effective.

Related:
Photometric daylight setup in V-Ray for Maya