The "normal" of a polygon is a vector pointing straight out from it perpendicularly. Thus polygons of the ground have normals pointing up. To determine the normal (or rather, just the Y component) of the polygon collided against you use CollisionNY. From the Y component you can determine if the vector is pointing up (straight up is 1, decreasing to zero as the polygon faces away.)
how to make a "jump" in 3D ?
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