Editing FAQ - Troubleshooting & How-To
Below are some common issues mappers have had in the Editor's Guild forum with common solutions.
Q. Some of my brushes have disappeared or turned black and won't render.
A. This can happen when two touching brushes around the seam are not perfectly flush with one another and the rendering hiccups for those brushes & brushes behind it, either there's a tiny wedge or overlap or gap or weird angle between them. The usual solution is to make sure the brushes are snapped to the grid and perfectly flush against one another, or more generally to simplify the brushwork around the seam of the disappearing brushes.
Q. My AI will not pass through a vis-portal no matter how I set up the path nodes.
A. Check that the sides of the visportal use the nodraw texture.
Q. My visportal is not closing like it should (you can check this with by typing "r_showportals 1" in the console).
A. A common reason for that is that the two areas separated by the portal are not hermetically sealed, i.e., that there may be an unportaled gap between the two, possibly covered up by func_static (which do not seal) or possibly caused by an inadvertent hole created by the first FAQ question above.