Mapping/Ladders

From UFO:AI

As you can see on the image the step-on surface is bigger than the stairs. In the lower left view this is highlighted. This is needed because the soldiers needs to be completly inside the step-on surface to go upstairs. If you miss the clipping area below the stairs the soldier might fall through the stairs.

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Notes

The stepon brush must not start between the floors. The brush must have its origin at z-axis 0, 64, 128 and so on - a stepon that start e.g. at z-axis 12 may lead to problems. The same applies for the actorclip brushes (named playerclip in the images).
Ideally the stepon brush must end one level above the stair (ie if the stair goes from level 1 to level 2, the stepon should go from z=0 to z=128)
The stepon brush must include a full square (32x32) in front of your stair at the lowest floor as shown above (otherwise it may works ...or not depending on the stair)
Use the texture convention to make it clear which brush is which:
- stepon => tex_material/c_blue
- actorclip => tex_material/c_orange2.
Do not make stairs too steep. Angles of less than 45 degrees should be fine.
keep the understair actorclip sufficiently below the stairs, as shown by the white mark below.