Elements look transparent in the 3D window

Issue Description

Some elements in your model adopted a transparent look in 3D, or only their contours are visible.

Solution

Here are some possible causes for this issue:

Layers set to Wireframe

1. Go to the Layer dialogue box Document > Layers > Layer Options.
2. Check what Layer the wireframe/transparent elements are in.

3. Find the elements' Layer in your Layers list.

   

4. On the right of the Layer's name, you will find the render icon
5. There are 2 settings available: a Solid and Wireframe.
6. Click once on the render icon to toggle the status from Wireframe to Solid.

Fade Environment is Active in the Design options Palette: 

When working with Design Options it is possible to activate a setting that changes the appearance of elements to help distinguish if you are working on an Option or the Main Model. 

To deactivate it:

1. Go to Window > Palettes > Design Options to open the Design Options palette.
2. Uncheck Fade Environment in the Design Options palette.

Note: Once you Accept & Merge a Design Option into the Main Model, the 3D display of the elements will go back to normal.