Gel (Portal 2)

The Repulsion gel effect.

Gel or paint is a puzzle element of Portal 2. It flows out of droppers in blobs, and covers any surface or object it splashes on, changing its physical properties. Water streams behave the same way gel does, but cleans gel off surfaces. Gel streams can be redirected with portals and funnels.

There are three types of gel, and water. Repulsion gel is blue, and causes things to bounce around. Propulsion gel is orange, and makes objects slippery and players move quickly. Conversion gel is white, and allows the placement of portals.

Creation

Use an info_paint_sprayer.

• Set the Paint Type in the info_paint_sprayer's properties to select blue/orange/white gel or water.
• Set its Start Active? property to Yes if you want it to always drop paint.
• You will probably want a dropper as a prop, such as item_dropper.
• Make sure you set "Paint in map" in the Map Properties to yes, or paint won't adhere to surfaces.

External links

• Example map using this tutorial. VMF included.