Cutting intersecting grooves into surface

SketchUp
21

It seems there are some relatively short edges near the top of the cross shape. I think the line tools is preferring to snap out of plan. Turn on hidden and zoom in a bit. I was able to get the top face to reform after two lines.
I also intersected the geometry of the cross part first.

Shep

22

Even when the geometry is perfectly aligned you get issues with it. It is part of the same bug.
Here’s another workaround.
Intersect Cross

1 Like
23

Floating point precision errors - to be expected with most 3D computations.

3 Likes
24

I know about floating point precision. I thought maybe Sketchup should be taught to do some rounding when merging geometry. :wink:

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SketchUp use a tolerance of 1/1000" of an inch.

26

OK It’s some other bug then.

27

I believe it relates to the orientation of the intersecting surfaces. Here’s another workaround similar to @Box’s:

2017-08-08_06h58_39

28

Gentlepersons (PC enough?),

Basically this is what I got out of all this:

  1. draw intersecting cylinders (to create grooves).
  2. select both cylinders, entirely, and ‘Reverse Faces’.
  3. ‘Select All’, and select ‘Intersect Faces / With Selection’
  4. Select tops of cylinders and delete.
  5. Select the 4 intersecting lines that cross at the axis.
  6. Select entire surface.
  7. Now, apparently to circumvent a bug in the software and get the software to start thinking correctly again, draw a line over one of existing lines?
  8. At this point the crossing groove surfaces should be selectable without also selecting the entire surface.
  9. delete top cylinder surface, and you should be left with only the crossing grooves with connecting remnants which you should carefully delete.

Wow. It’s a bit weird, and you’ll find that if you get just a bit more complex than this, like drilling intersecting holes through the plate, SU really gets messed up.

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