Get Gmod Teleporter Portal / Doors Linker addon here: https://osgmod.com/gmod-scripts/3940/teleportation-portal-gmod-addon

Video : https://www.youtube.com/watch?v=5Hys5IthR28

Description:
You have maps on your Gmod servers with a lot of doors but which are useless because they are scenery... Or rooms that are inaccessible without having to switch to noclip (which your users usually can't use in their normal game session). Create a simple and pleasant fluid transition between two points with Gmod Teleportation Portal, the user sees a door or a luminous point, he will have the reflex to press USE this time something will happen, a door sound (editable) is played, the screen becomes black, a loading bar is displayed (editable) with a custom message that appears smoothly in the middle of the screen before clearing up again (this transition time is also editable if you want it to last 10 seconds), you will have understood that you have just moved to another area of the map without realizing it which is not unpleasant.

By giving access to non usable areas of the map you exploit all its potential because it allows you to extend the game area on your server or simply to offer a possibility to explore areas in a different and fast way from a teleportation point or machine since the original model (a grey cube) is replaceable from the configuration of the teleportation point, replace it by another of your models or by a special effect. See the video for the demonstration.

❓ Don't know what else to do with this script, here are some ideas for using the system?
To begin with, know that it can be either a door or a teleporter. That you have the choice to make it invisible (when the door already exists on the map), modify the model or simply display a special particle effect triggered by Gmod ParticleEffectAttach by simply inserting your FX name into the parameter.

Ideas for use:
1: Place transition points between two useless gates on your map originally to create a useful passage, and make the gray cube invisible from the interface.
2: If there is no door, create one, turn the gray cube model into a door from a door model and stick it to the wall to create a transition point to another point.
3: Your server is not a serious survival horror but a fantasy world of magic in which you assume the full magical part of teleportation then, turn the teleportation point into a magic portal, add the name of the effect and the gray cube becomes a point that will play the special effect, replace the teleportation sounds and reduce the transition time to 0 seconds, which will disable the loading time for instant teleportation.

Official source: https://osgmod.com/gmod-scripts/3940/teleportation-portal-gmod-addon