Multiple faces driving me crazy!
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@thomthom said:
I get this from time to time as well. I suspect it's when I base geometry on imported CAD data which some times have some tiny inaccuracy that triggers some precision bug in SketchUp. PITA! X_x
Well, I know this is not the problem, at least in my case, because I don't use imported CAD data. I can't even spell CAD
It might not be so frustrating if it only added one extra face, at least then I would know that I could just delete the extra face and move on. But up to seven faces? What on earth could cause that? All I'm doing is either adding a face or subdividing an existing face, nothing complicated or mysterious about that. And I'm not talking about one particular model that's causing the problem, it happens, randomly, with no particular rhyme or reason, on whatever model I happen to be working on. And I know it's not a problem with a particular installation of SU, I have SU on several computers and it happens with each of them. Right now, because I never know how many extra faces there are, I just keep deleting them until there is no face, then undo the last deletion. Not the ideal solution.
It's not an earth-shattering problem, I know that I can fix it when it happens, it's just so dang annoying, it's a pothole in the road when I'm otherwise just cruising along creating another masterpiece (in my dreams). What I was really hoping was that it was a problem that other SU users had solved long ago and in my noobie ignorance had just not puzzled out the solution for myself.
Maybe somebody could write a plugin that makes extra faces a different color, at least that way I could just keep deleting them until the color was right
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Anyhow, thanks for all your input. I guess I'll just add it to my ever-growing list of SU peculiarities, and live with it. It's getting to the point that sometimes I wish I had never stumbled across SU. I certainly would have more free time to grow old. -
"Remove Duplicate Faces" in CleanUp tries to remove such faces. But beware it's very slow.
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@hellnbak said:
.... And I'm not talking about one particular model that's causing the problem, it happens, randomly, with no particular rhyme or reason, on whatever model I happen to be working on........
I don't have a clue whatsoever. It doesn't ever happen to my models.
So share one of yours, if possible. -
@wo3dan said:
It doesn't ever happen to my models.
So you're saying that you have never had a multiple face on any of your models?
You really need to buy a lottery ticket
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Yes, that's what I said.
@hellnbak said:
...You really need to buy a lottery ticket
I'd rather have that model of yours instead of the ticket.
For I also never win with lotteries.
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I get the double face on occasion as well. Don't have a clue why, as they seem to form randomly in areas where I have never edited, but seem to occur after I do an intersection to that surface.
BUT, I have discovered 2 ways to find them.
The first applies to surfaces that have some curve in them. It does not work with flat surfaces.
With all lines on the surface both soft and smooth, and hidden lines off, roll and rotate the surface and examine it carefully. You will see some individual faces seem to have a decidedly harder outline and seem somewhat flat. They are double faced. Just delete the "flat" face after you turn on hidden lines.In the 2nd method, I found that when I made some surfaces (flat or curved) in a semi-transparent material (both front and back faces, not just 1 face) I saw some individual faces had a slightly darker appearance. Those were the double faces.
So, if you suspect double faces, select the whole surface, paint both sides with some throw-away color. Edit that color to be semi-transparent (around 20-50%) and view the surface with with hidden lines off. Delete the darker faces after you turn on hidden lines. Then repaint with desired color. -
I would add to this, that another way to inspect for duplicate faces is to turn on xray mode and orbit to inspect faces. At least on my machine the doubled faces are a little less transparent than others.
You can also see internal unwanted closed faces when you visually compare the sharpness of edges seen through multiple layers of faces. Internal closed faces readily form when loops of edges are coplanar and aligned with global axis. -
@hellnbak: Do you by chance, have quick hands? That is, do you model quickly? This may be nothing, but maybe some double clicking or something?
My machine is borderline acceptable, and I am a slow modeler, but of course I do get these duplicate faces occasionally.
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I'll get it running the Make faces plugin from time to time. I've had instances where I'll get 15 or more faces on top of each other. You can tell when you go to texture it and nothing shows up. Usually running and intersect followed by Thom's cleanup will sort most of it out. It is very frustrating sometimes. Sketchup and profanity seem to go hand in hand in my house.
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Thanks for the suggestions, but finding the multiple faces is not a problem, I was just hoping that someone had a good tip on how to avoid creating the faces in the first place. Actually I wasn't very hopeful, but figured it was worth a shot. Like I said, I'll just have to live with it (just like all the other SU strange and annoying quirks
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Quirks or charm?
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Hmmmm.....I'll have to go with quirks, and I'm being kind. Maybe SNAFU would be closer. I know now why they made SU free - you can't demand a refund for something you didn't pay for
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@hellnbak said:
... I was just hoping that someone had a good tip on how to avoid creating the faces in the first place. Actually I wasn't very hopeful, but figured it was worth a shot. ......
I haven't seen any example model yet, showing this very issue. There's no guarantee whatsoever that I'll be able to come up with an answer but I wasn't joking in offering to seriously look into it.
Well, it's up to you. -
Sorry. My models are too large to attach to the forum, so I've attached just a hood from one. I do remember that it, like most other things I've worked on, enlarged my vocabulary as far as multiple faces when I was making it, adding faces and subdividing them. That's not to say that it will do the same for you, maybe you've got that one in a million copies of SU that is problem-free. If so, I'll buy your computer, price is no object
How 'bout just the hard drive?By the way, you didn't answer my question - have you really never encountered multiple faces in any of your models? Even just a double face?
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Here's a sample of mine. Draw lines on the faces in this model and you'll find that SketchUp starts adding extra faces where there already are faces.
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@thomthom said:
Here's a sample of mine. Draw lines on the faces in this model and you'll find that SketchUp starts adding extra faces where there already are faces.
Well, I drew lines all over it, subdivided it, kicked it, screamed at it and caressed it, and wouldn't you know it - not a single extra face
Actually that was one reason I was reluctant to upload a model, I figured that Murphy's law would guarantee that the problem wouldn't show itself when you wanted it to. -
@hellnbak said:
@thomthom said:
Here's a sample of mine. Draw lines on the faces in this model and you'll find that SketchUp starts adding extra faces where there already are faces.
Well, I drew lines all over it, subdivided it, kicked it, screamed at it and caressed it, and wouldn't you know it - not a single extra face
Actually that was one reason I was reluctant to upload a model, I figured that Murphy's law would guarantee that the problem wouldn't show itself when you wanted it to.Before drawing a line:
drag a selection rectangle right-to-left over one of the large faces. It should select two - the one you see and the one on the back.
Now draw some lines criss-crossing the large face, make the selection rectangle again over one of the faces, it now selects more than two faces.
Happens every time. -
Yup, that did it. I'm assuming this model is made up of just normal faces, so what does using the select tool first, and specifically right to left, have to do with it. And more importantly, is there maybe something in this that could help me with avoiding the double faces, something I may be doing that is causing them? I don't see what it could be, but I'm still a little hopeful.
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I did managed to get the extra faces as suggested - there are two extra pairs plus the original [3 'overlays'].
If occurs if I draw a diagonal on the large face with the tiny 'spike' at its base.Another interesting observation...
IF I draw the diagonal so that its end point is less in the Z and greater in the Y [than the start] I get NO extra faces... BUT if I draw the same diagonal on the face with its start and end points transposed, OR I make the other diagonal [in either direction] then there are extra faces added...Just weird...
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@hellnbak said:
Yup, that did it. I'm assuming this model is made up of just normal faces, so what does using the select tool first, and specifically right to left, have to do with it.
Just a method of counting the number of overlapping faces.
If one of the faces had a different material you'd see z-fighting.
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