is there any way to angle snap in blender. I mean so that whenever i use the rotation gizmo it rotates with the increments of a specific value???
I don’t know about specific custom values, but ctrl snaps rotation to 5-degree values, shift+ctrl snaps to one-degree values.
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Ok thanks. that did it. cheers 
You can also do exact rotations with keyboard shortcuts. For instance, 23 degrees around the z-axis would be:
- r
- z
- 23
- Enter
I’m sure you can extrapolate from there.
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the brilliance of Blender !