Every surface in the game currently uses the engine’s default walkable slope of about 44.8 degrees. A wet granite slab, deep snow and loose scree all walk exactly like dry forest floor, which erases some of the most real hazards in a Sierra landscape.
A proposed contact rule, built from published friction ranges, puts the walkable limit near 30 degrees on dry rough granite and about 16 degrees when it is wet. Glacially polished granite drops below 5 degrees when wet. Scree starts to flow on steeper ground, and snow barely holds at all. A second review caught two errors in the sliding math before anything went further: one step could overshoot the point where a sliding body should stop, and a body moving across flat rock never slowed down.
Water received the same treatment. Waist-deep water sweeps a person off their feet above about 0.8 m/s, and a soaked player would still be about 15 percent wet an hour later, which is a good reason to want a fire. A related rule for resting objects showed a log across a gully going from 10 cm of safety margin to 50 cm short when its wedge stone is pulled out. These are standalone rules with passing tests. None of it is in the game.
