This problem is not really like
“How to find the center of the circle.”
When a shape is drawn, it keeps all the features to connect to handles and when you hover, many handles appear. That I know.
I went to 3D WareHouse and found pipes.
Steel_Nipple_Sch40_1in.skp
Once I move to copy them and they are out of their frame,
when I double click on it, every items that constitute the shape are separated.
Some side of the circle (cylinders) are larger than others so it is pretty hard to select an endpoint that is exactly at 180 degrees on the other side of the circle.
When I select the whole shape (which is a group) I can see the cubic form around the shape but it is a group, so I cannot select something that I can trust as to be exactly at the center of the circle.
I will try to leave you a picture.
Because, even if I deleted all other 20 pipes size, the file keeps saving at 38Mb.
Even for a single 6inch pipe.
Assuming their are vertices across the center from each other you could put in a couple of guidelines between them that intersect at the center. There is a plugin available from Sketchucation called Exploded Arc Lines to Arc that will convert an exploded circle back to a circle. There are some other plugins that will find the centers of exploded acrs, too.
How about sharing the .skp file. I tried searching on the name you gave but didn’t find it.
Here I selected two neighboring edge segments and used Arc Centerpoint Finder by Chris Fullmer which is available in the Extension Warehouse. It doesn’t recrate the circle but it does find the center.
This suggests to me that there are component definitions in the model for which there are no instances arranged in the model’s 3D space. When you import or download a component into the model, this actually adds two things: the component definition, and an instance (a “living, breathing copy”) of the component. Deleting the instance (the visible copy in the 3D model space) does not delete the definition - it remains in the file (and consumes most of the space related to the component). There is a Purge Unused function on the Components window which will cause SketchUp to remove all component definitions for which there are no actual instances in the model.
I love the plug ins but a very simple way to find the centre is to use chords, Any chord, a straight line through the circumference of the circle with a line drawn at 90° from the its’ centre will pass through the circle’s centre. Select at least 2 chords and draw the lines at 90° from their centre point and the intersection will give the circle centre, alternatively if the circle is still complete, right click on it and select ‘find centre’ sorry “center” - I’m British.
The very nature of sketchup geometry and the inference engine helps you with this.
Assuming the original circle has been drawn with an equal number of segments you can just draw an edge between any two opposite vertices. Here I have deliberately drawn the circle off axis and exploded the curve.
So join the dots and use the midpoint of the edge.
Draw perpendicular lines from the midpoint of two edges of the arc or circle. Their intersection is the center point of the arc or circle. Very quick to do and no plugin needed.
