Thanks, rclub, I was able to follow your recipe. I must say that I found the line drawing (to repair the broken faces) exceptionally painful. I am also left with the outline of a polygon at the bottom of the disc. To delete this, I need to ungroup the polygon again. Interesting stuff. Thanks very much for your help.
Posts made by ollie2893
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RE: How to drill a hole into a contoured surface
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RE: How to drill a hole into a contoured surface
It also occurred to me that I could fix this problem by extruding the bottom of the polygon further down. To my surprise, when I hide the ring, the polygon presents itself without a bottom face that I could further extrude
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RE: How to drill a hole into a contoured surface
Thanks again, rclub. I follow you precisely to step 5 but I have a problem: how do you hide the extruded polygon? The only way I could do this was in stages. Hide the top and faces, then hide the bottom. Strangely, though, even once I hid the bottom, I don't get to your picture 5. My approximation of your picture 5 shows a line across each cut-out - as if left behind by the bottom of the polygon. Furthermore, if I redraw the line (that you do not have), I do not get a semi-circular face. My SU simply refuses to make a new face from the arch + line. Sorry, I don't get this...
Edit: Here's a screenshot of what I'm left with after I hide the polygon...
[attachment]sketch.jpg[/attachment]
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RE: How to drill a hole into a contoured surface
@gaieus said:
Attach the problematic structure and everyone will be happier to help.
Check out post #5 - I'm still struggling with this BB... -
RE: How to drill a hole into a contoured surface
Yes, like yours rclub. How did you do that? TIG, your approach might work so long as I can pull the polygon into the ring. The problem is that I want the rounded cut-out to match the width of a face of the polygon so I find it easier to jam the polygon into the ring first and then cut out the holes, which is, I think, what rclub's been up to. I just don't understand why his polygon face is still intact, whlist mine is cut away.
More fundamentally, though, how do I make a 3D entity truly solid (as opposed to hollow, which they appear to come by default)?
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RE: How to drill a hole into a contoured surface
Thanks Gaieus and rclub. I did not know about the Intersect feature. I am getting somewhere. I have hit upon another fundamental misunderstanding:
I illustrate the point at which I have just deleted one of the pipes which I extruded from outside the model just up to the face of the polygon (as suggested by you). When I now delete the extraneous geometry, I am left with a "hole" into my structure.
It seems to me that whenever pull a face, then I am actually creating a "tin" and not a solid. If my pie and polygon were solids, then erasing the stubby pipe would not afford an insight into the hollow structure.
Where am I going wrong? Would I need to tell SU to make the pie and polygon solid? How? Or would I have needed to be more careful somehow (how?) in inserting the stubby pipes?
Thanks again.
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How to drill a hole into a contoured surface
Hi,
if you make a circle
pull it up so that you have a pie
how can I now drill a hole into the (rounded) side of the pie?Thanks.
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RE: How to split an entity into segments
Ok, thanks, that works, yes. So just to complete this subject, your suggestion sort of works around the issue. Are we saying that there is a way to go from segments to entity (via using the Entity Info) but not from entity to segments?
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How to split an entity into segments
Hi,
I am new to SketchUp, and am generally very impressed with the user interface. I must have missed a trick watching the on-line tutorials, though. Here's my problem:
I draw a circle. By default, it does not have enough segments. So I open the Entity Info and up the segment count. Done. Great.
I draw a polygon, same center point as circle. If I now extend the radius of this polygon just beyond that of the circle, then I get the effect that I want: I can now use the Eraser tool to delete every corner that protrudes beyond the circle, and every arch that protrudes beyond the face of the polygon. I end up with a shape that looks a little like a classic pencil shaft.
However ... the polygon I get by default does not have enough sides. So before I can start with the erasing, I need to up the segment count in my polygon. Once I did this thru the Entity Info, though, the manipulation that I described before no longer works because now the polygon has been promoted to an entity in its own right. No longer are there intersecting elements between the circle and the polygon. And it is no longer possible to erase individual segments. I can now only erase the polygon or the circle in whole.
I have worked out that on the entity context menu, there are Divide and Explode options. Unfortunately, Divide blindly halves the circle, and Explode blindly shreds the circle into small segments that may or may not intersect with the lines of the polygon.
I have also worked out a work-around: I can create a dummy polygon first, change its segment attribute, delete it and create the polygon I actually want. That seems to do the trick. However, this is slightly bizarre so I thought I ask what the official method is to revert back from a geometric entity to a segment composition?
Thanks.