Gif example: I get no face on exploded (imported) image


#1

Hey,
in some cases I don’t get a face when I connect lines. It happens when I’m drawing over an exploded image. I’ve created a little example. The lines are parallel to the correct axis (they are green and red if i change the color style to ‘by axis’).


Do I have to draw over the individual lines each time?


#2

What happens if you draw over an unexploded image? Why do you explode the image anyway?

Set the precision as high as it will go and then check the Z coordinates of all the intersections and endpoints using the Text tool. Are they all exactly the same?


#3

If I don’t explode the image, the faces are created fine.

I explode the image because I saw this in a tutorial. It’s easy to draw over a floor plan: if the image is exploded, the walls get the texture of the plan so you can see where the windows are and stuff…


#4

I would suggest waiting until after you’ve drawn the floor plan before exploding the image. this will make it easier to avoid reversed faces.


#5

That happens some times. I think it’s one of those old bugs, that got stuck since the old versions.

For me, selecting all geometry and choosing Intersect Faces > With Selection works, sometimes. Other times I shift to Wireframe Mode > select all edges > Ctrl+X > Ctrl+Shift+V (Paste in Place) > And use the Make Face plugin to generate meshes.

Here’s a similar problem that I faced a long while ago:


#6

The Z-coordinates seem fine (I hope I understood correctly, didn’t know the text tool yet) :


#7

Increase the precision as high as it will go. Use millimeters instead of meters, too.


#8

The Z looks fine I think…
Thanks for the link VahePogossian, I’m checking it out…


#9

OK. It’s not uncommon for users to be very slightly off axis which can create issues. There is a tolerance so that you can be almost on axis and still get the colored trailing line but be off axis enough to result in no face.


#10

What Dave forgot to say is that you can avoid that particular problem by paying scrupulous attention to inference engine snaps.


#11

Also the quicker way to trace over an image of a floor plan is to use the rectangle tool.
This auto-faces and since the two snapped corners are on the image it’s flat…
By over drawing and overlapping rectangles you can quickly get the room’s outlines.
A few added lines if needed…
After that you can do some judicious erasing to merge some outlines together…


#12

thanks for the hint. In my case (and with my old floor plan and limited experience) it was easier to draw the lines individually :slight_smile:


#13

hey slbaumgartner, I have no idea about the things you are talking about…?


#14

The little markers and tooltips that pop up as you move your cursor while drawing. Scroll down and read the sections about inferences on this help page:

http://help.sketchup.com/en/article/3000083


#15

thanks for your link. I checked the video that was in the comments (https://youtu.be/-yf2tvmbQRw) and it seems that this is solving my problem:
-select all
-intersect faces -> with selection

I tried to reproduce, and it only happens when using the ‘explode’ on my floorplan. Maybe there is a better way to make the floorplan transparent so you can still see once you start drawing the walls…


#16

You’re welcome. Yes, like I said Intersect Faces With Selection is one way to try to solve this issue. Glad your problem is solved.

And yes, there actually is a trick I use when tracing JPG floorplans. Parallel Projection > Top View > X-Ray Mode. :wink: