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circle

A certain doubt always looms, when this circle is clicked ( by default ), it always remains near the screen. I mean with a click at most the cursor goes a bit away but not far from it. How does one get to place it lets say 20 measuring units ( inches or meters ) away.

Because it is in 3d space, this cursor should diminish in size as it goes far. That is my notion. could somebody clarify this.

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