Can I use a spherical brush to select the edges of a mesh in a three-dimensional window?

Development
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Can I use a spherical brush to select the edges(mark the surface) of a mesh in a three-dimensional window?

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2

Could you clarify what do you mean by marking the surface and what you are trying to achieve?

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I want select the red area of the tumor just like the screen what I did in 3-matic by mark tool.

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This is called Scissors effect in Segment Editor.

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I can get the edge by follow steps:
1.segment the tumor
2.hollow
3.crop the hollow by scissors many times

So can I do it just paint like this pictrue.
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I don’t think I understand what you mean. Can you explain what you are trying to achieve?