I have a model of building that uses trusses. The truss edges show through what should be 3/4 inch of roof decking when the eye position is at a certain angle/distance such as with the ISO view. zoom in and the edges disappear.
This has been happening forever when you have really thin objects… part of the way the profiles / surfaces act at distances where the thickness of the edge and the thickness of the object fight with each other.
The solution is to use Tags and hide the trusses in the exterior scenes.
If what you are saying is true, and I believe it, it is pretty bad if the sketchup developers can’t resolve this. I don’t consider .75 inch to be “really thin” and edges aren’t supposed to have “thickness” in Sketchup land. And yes I have them tagged and that is a workaround in this case maybe. It wouldn’t be if I wanted part of the trusses to be exposed.
Thank you for your quick answer, I don’t know if you are with Sketchup. Its time for Sketchup to get it together and fix some of these deficiencies if they want to stay relevant. A recent post and commentary from a lot of serious and loyal Sketchup customers: https://youtu.be/rb385302GzA?si=0LpRM1uQK7m4ORSz
I’m not from SketchUp, just a user (like many others) who comment here trying to help. You can tell who is from SketchUp because it will say so up by their little user circle / name / profile icon. I’m sure someone from the dev team could jump in and explain the technical reasons…
.75” is really thin when you zoom out from a building. It is not so thin if you are modeling a piece of jewelry.
Like I said - it’s done this forever.
It’s a graphics issue - SKP has to decide what to show - and the rendering of the thickness of the profiles (those nice edges you see on your trusses and building components) competes as you zoom out with how thin that plywood is.
You could setup a style where edges are all off.
Off topic:
Give blender or Rhino a try for modeling trusses and architecture and report back. I’m curious as to how easy it is do, as I’m always looking at how to get my work done faster.
This is something that I first encountered in the late 1980s when doing hidden line perspectives in AutoCad. The hidden line algorithms just have to stop somewhere so their accuracy is always limited.
As the others have said it is a long term graphic issue. It is related to z-fighting and clipping and is basically about how the camera works with faces and edges and distances within 3d.
One of the easiest fixes is, as you mentioned (not to mention), to actually hide the edges on the top of your trusses. If you have created them as components it should take a few clicks to fix them.
Here’s an example from about a decade ago showing how it works.
I can’t find out which exact version had the improvement, a few updates ago the distance that you had to back away from something for edges to show through faces slightly closer to the camera, was improved.
