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I don't understand what the white circle with the cross is for. I can change its position by left mouse click in the 3D view. Why does it change its position and what it is for?

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This is the 3D Cursor, and is useful for several things in advanced editing. When you left-click you are setting the position in 3D space for it to be. It works in all modes.

If you would like some more details, go to the Blender Manual.

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The

white circle with cross

is drawn around center of an object and is the center of manipulations like translation, rotation and scale.

enter image description here

this not to be confused with the 3D cursor a red/white dashed circle (looks more like a life ring) it is used to indicate position where an object is created e.g. when you add a cube in Object Mode.

The 3D cursor can be used in Edit Mode e.g as pivot point and is set by left clicking.

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  • $\begingroup$ I had 3D cursor in mind but I made mistake while describing it. $\endgroup$ – Bartek Kosa Jan 12 '15 at 17:04
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One use for your '3D Cursor' is to set a spawn position for newly created meshes and other things. When you press Shift + A to bring the appropriate menu (where you import meshes, lamps, cameras ect.) then clicking an item will spawn it right where your 3D cursor is. It really is pretty basic, but don't feel bad! We were all noobs once before! Even I'm still unfamiliar with a lot of the functions. Honestly, it's really the most un-intuitive basic feature! :)

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I often use the cursor when I need to edit something at a very specific location. Most of the time it's something out of the Shift+S menu.

  • Cursor to selected. use when trying to add and object at a location, select the objectby right clicking on it, Shift+S > cursor to selected.

  • Cursor to center. probably the one I use the most, when you misplace your cursor, and just want it back to the center of the scene; also accomplished by Shift+C but that re-centers your entire screen.

  • Cursor to grid. use so that your cursor is hanging in a more geometric place, not just off in space.

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