Grinders

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Grinders are an environmental hazard seen most prominently in the MvM map Mannhattan. They resemble a wood shredder, and they are a direct danger to not only humans, but robots as well. Be careful where and how you implement this element, as it may allow for tele-trapping and team killing.

This article will cover creating the Grinder outside of an MvM map, which means robots will not be affected by it.

Basic Setup

Create 4 brushes, essentially forming a 288x192 hole. Next, create two prop_dynamic entities and place them next to eachother. Set the World Model property to props_urban/urban_shredder, match your two models on the grid to make sure they don't clip. Now, flip one model horizontally by selecting it in the 3D view, then pressing right mouse button on it now in the 2D view, hover over the Flip Objects dropdown menu and hit Flip Horizontally. Position the blades as shown in picture.