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A circle (Mesh object) only shows the outline. A plane (mesh object) showed up properly. How can I make this circle look like a plane? When I switch to the edit mode, the circle is shown with vertices unlike a plane. Please advise me how to fix this issue so that a circle will show up properly.

enter image description here

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By default blender doesn't fill the circle. There are two types of fillings for circle. You can do it either manually or select it from the pop-up menu that appears when you add in the circle. The two types of filling are:-

1. Ngon-

In this type of filling it'll just add in a single face.

You can manually make it by switching to Edit Mode, select all vertices and press F or select it as shown in the image:enter image description here The disadvantage of ngon filling is that you wont be able to add in loopcuts .

enter image description here

2. Triangle Fan

In this filling, there is a center vertex which is connected with all other outer vertices.

In this type of filling you can easily add in circular loopcuts to add more geometry if needed.

You can manually model it by selecting all vertices in edit mode with A fill it usually with F and navigate to Face > Poke Faces OR select it from the pop-up menu. enter image description here

Selecting between this two fillings depend on when and where you use it.

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  • $\begingroup$ Thank you very much! $\endgroup$ – user102190 Aug 5 '20 at 19:10
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    $\begingroup$ Another way to get a triangle fan from an unfilled circles is with "Face → Poke Faces" $\endgroup$ – Ilmo Euro Aug 24 '20 at 11:55
  • $\begingroup$ I'm sorry, I meant you get the triangle fan from a filled circle with poke faces, not unfilled. $\endgroup$ – Ilmo Euro Aug 24 '20 at 14:32
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The meaning

I think the word "circle" in this case means the closed curve that is made of points that are all the same distance from the center. So it is a curve because it is supposed to be just a curve. It would probably be more correct to call the area of a plane that is limited by a circle a disc. So I think in a mathematical or geometric sense this is correct - if you want to create a circle and choose this option from the menu, it should create a circle and it is just a curve.

But why?

The reason behind Blender having a circle as opposed to a disc or something else as one of the basic 3d primitives is another question. This question is a bit harder to answer. Thinking logically, it is hard to come up with a definite reason why it should be this way and not another and it might be that there is no definitive logical reason why it is this way. We might as well have a disc instead of a circle or have both of them, but it just happens to be what was chosen by whoever was programming this and since it is so easy to fill it with just pressing a followed by f after entering edit mode(Tab), there is probably little reason for developers to put much more thought to this.

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  • $\begingroup$ Thank you very much! $\endgroup$ – user102190 Aug 5 '20 at 19:10
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By default, the circle has no faces. Go into edit mode, select all and press F for fill and it will create a face for the object.

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In Edit Mode select all A and make a face F .

A circle is just 360 deg vertices with however many vertices you selected. In the bpy module you can see it draws a fill for cubes by connecting different edges but the circle is just one edge bending around which is why it may not fill automatically. I'm not sure though.

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    $\begingroup$ "the circle is just one edge bending around" mesh edges don't "bend". A circle is not a single edge, there is one between each of vertex $\endgroup$ – Duarte Farrajota Ramos Aug 4 '20 at 23:04
  • $\begingroup$ thank you for the correction sir! @DuarteFarrajotaRamos $\endgroup$ – Stephen from Ireland Aug 4 '20 at 23:33

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