I noticed that when I add new object it is very tiny compared to existing objects. In the example on the photo it is 10 times smaller.
Viewport scale is 0.001
What is the problem?
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Viewport Scale in Blender is and should be 1 (not 0.001). Reasons follow.
There are legitimate reasons to reset the
Viewport Scale to something much larger or smaller, but unless you don't have or know these reasons, it should not be altered, otherwise you might experience some serious strange behaviour.
In Blender, the default unit of the standard cube is 1 meter. Since the default cube has an extent of 1 meter in all directions, positive and negative, the edge length of the default cube is 2 meters.
If you want to create scenes in Blender whose scales are significantly larger or smaller than in the normal world, then it is recommended to adjust the
Viewort Scale. This is because this scale is used as a reference for many aspects of the Blender environment, including physics simulations, rendering settings, camera phsysics (i.e. optics), and real-world scale modeling. Again, having "things" in the wrong scale may cause problems, or otherwise: If you try to scale your micro-world into the standard 1-meter world, you will have to account for a whole bunch of other things to "get right", which could resolve quite easily if you instead had chosen the correct scale of your world.
Viewport Scale is by default 1.
When you import or add objects into Blender with a "strange"
Viewport Scale, they may appear much smaller or larger because they are typically created with real-world measurements in mind.
Your problem may be a problem in one certain scene - you or someone accidentally or intentional changed the
Viewport Scale (for what reason ever). If this intention is valid, then stay with it - the benefits may be worth the mentioned sideeffects.
If it's unintentional - go change it back to normal!
If this behavior occurs even in new scenes, then you might unintentionally have changed the default scene of Blender.
You have accidentially changed the default settings in the startup file.
File => Defaultsyou can select
Load Factory Settings. This will reset all your default settings, you may loose settings th tyou changed intentionally.
File => New => General(= loading your customized Default scene), change the
Viewport Scalevalue back to 1, then got to
File => Defaults => Save Startup File, which will write your customized settings with the standard
Viewport Scaleinto your startup File.