Paint Tab for new design

I have drawn a design to include in some wood turnings. I’m having a problem getting the different section to fill. Please can someone explain what I have done wrong"Square Design 2 Jim Mc.skp (113.4 KB)

You’ve got all kinds of Z-fighting going on and you have some reversed faces. It’s kind of no wonder you can’t get things painted properly.

Hi Dave,

What does z fighting mean? can you direct me on how to fix the problem?

Z-fighting happens when you have more than one face in the same plane. You could try deleting one the extra faces. Select it and hit the Delete button.

Dave ,
This is the latest drawing, I have deleted and redrawn, still I can’t get the sections to colour.
TGC,Square Design 2 Jim Mc.skp (107.1 KB)

Now you’ve delete all of the faces in some locations. You can see the background color showing through.

As it turned out, you’ve hidden some geometry which isn’t helping.

In the attached drawing, the colours are as I want them but as soon as I enclose the design in a circle the colours disappears.

TGC.[Square Design 2 Jim Mc.skp|attachment]Square Design 2 Jim Mc.skp (95.5 KB)

There are many small errors in your modeling, tiny variances where the lines do not meet up and none of the measurement are exact. I noticed that you are working with Window>Model info> Units > enable length snapping turned on. You should uncheck this, it is known to potentially introduce small errors. If your objects is symmetrical, you only need model one quarter of it, then make a component of that quarter and radial copy it into a circle. This could make your modeling and colorizing easier.

Four sides, four different dimensions. I think it would be easier to start over than to fix this set of geometry.


Here is a quick version with the steps illustrated. This could have been done many ways, this method eliminates any math, measurement, or inputting any dimensions. Start with a .5m square (or any size) and use the inference engine for the rest, mostly just finding midpoints. The file has all the steps included as well as the finished pattern so you can follow along. Your profile does not include which version of SketchUp you are using, so I back-saved to v17 just in case.

Square Design 2 Jim Mc new fix 17.skp (163.5 KB)


Hi Riley,
Thanks for the reply. I 'm used SU Pro 2020. What you have done will help a great deal. I redrew the design checked all measurements OK. as soon as I draw circle around the perimeter I loose all colour. Could you please explain?

The model is full of small errors that make the surfaces not match up, when you add your circle you loose color because there is Z-fighting, 2 surfaces in very very close to the same place in space, essentially your model is not flat.

How are you checking your measurements? You Think the measurements are Ok because you have the display precision in Model Info turned down to 0.00, all displayed dimensions are rounded to this many decimal points. This only affects the dimensions you see displayed NOT the actual dimensions of your objects which are absolute. It’s like having a tape measure with only CM marked on it not MM, you could measure a board to the nearest CM but that does not make it that long. If you turn up the precision you will see that many of your edges are random lengths. They may also be random depths and have tiny overlaps at the edges, I suspect all your edges are not coplanar, in the same plane. There are a couple of common ways these tiny errors get introduced, one is having length snapping enabled, always uncheck that box. Another common mistake is moving one edge or surface with the move tool and dragging the connected geometry out of place slightly. If one continues to build referencing the slightly out of place geometry one can introduce errors throughout the model. It’s not uncommon to see whole houses or complex models all out of plane, not square and full of errors, sometimes unrecoverable.

I think you would be best served by starting over, if you open the file I sent (2020 should open it just fine, maybe you could update your profile) you will be able to chose any one of the steps to start with and make your own.

Thanks again Riley, that info helps a lot. 1 other question. where do I find coloured pencils as shown on your example?

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Glad that helps. If you are measuring something with the tape measure tool and looking in the VCB (the box in the lower right) you might see a tilde ˜ symbol next to the measurement, This indicates the measurement is approximate not exact and is a Red flag. ˜.50m is not .50m, beware the tilde!

You find them at the Apple store, It’s an option of the Mac materials pallet.

That’s all OK now. I use these designs as a decoration on wood turnings. Bowls Platters 5JMc.skp (194.3 KB)

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As a side note, I’ve noticed SketchUp quite often creates two faces (planes) on top of each other when you trace over an edge to complete a face or if coping & paste-in-placing geometry etc. When you go to paint a material to the face it won’t work, so you have to delete the top face to apply the materials to the bottom face.

And just to clarify, by bottom face I mean the top face underlying the extra top face, not reverse side or ‘bottom’ of a face, depending on what side is top…I’ll stop now…lol.