Half-Life was modded from the original Quake engine iirc. This way we can build test chambers in our Condos!

Optional: You could also add test elements from the first and second game if you wanted, being 'furniture' for one's Condo.

The camera should rotate to correct the player's view when travelling through a portal.

The item itself can be obtained in whatever way, but preferably from one of the stores.

Either let the portals conduct on lighter surfaces, or add wall plates that either allow or disallow portal placement for use within the player's Condo, taken from either game.

The primary/secondary portals have unique sounds and visuals from each other.

Left click shoots the primary (by default, blue) portal and right click shoots the secondary (by default, orange) portal.

The colors on the portal gun should match the color of the last portal shot.

The portals themselves can be from Portal or Portal 2.

All assets (except the portal recolors) should be taken from the first game.

Every player that has a Portal Gun will have a unique portal color pair from each other, with the default colors of the portals being blue and orange.

Make the device as close to the original games as possible.

This way, custom maps can utilize the device however they may need to. Edit from the future: Instead of limiting this device just to the condos, just make the portals only conduct on portalable surfaces/textures. The device is limited to the condos only, because it would impact the main lobby in a negative way. Make a ‘Portal Gun’ from Valve’s game Portal that can be used to create “portals”, quantum holes that maintain your velocity when passing through one and out the other.

Portal gun mod gmod