Invivible entities

[andrew]

From a QCAD user:

After loading my drawing, nothing appears on screen.
When I select all, the entities are there, but I cannot see them.

[andrew]

Most likely, you have drawn black entities on a black background or white entities on a white background.

There are three ways to resolve this:

Change the color of your entities

or

Change your background color

or

Let QCAD automatically make sure that entities are always visible:
Edit - Application Preferences - Graphics View:
Tick "Prevent white on white / black on black display"
Color lightness threshold: 10

[andrew]

Another common problem is that the drawing has huge extents and relatively small entities. This is for example the case, if a small entity is added at an extreme coordinate. You can find your entities by selecting all and looking for blue dots.