@Vaulsc has recently uploaded a battle report (timestamped on the right moment) where he played with Morats vs OSS, and his opponent used their Rudra's Climbing Plus to move underneath a bridge and hold onto its surface upside down. I know that Climbing Plus allows the user to move along vertical surfaces as if executing a normal movement on a horizontal surface, but this interaction looks really cool. Is it legal, though?
I don't see anything in the rules stating that you have to stand over an horizontal surface and not under it, so it seems legal to me.
The rules basically have horizontal terrain and vertical terrain. Horizontal terrain is terrain that can support a Troopers base, vertical terrain is all other flat terrain.
I agree with inane.imp upside down horizontal would fall into vertical terrain, along with any other sloped terrain. For example in the image below anything that is not the ground, would count as vertical terrain that can be climbed even if it is not perfectly vertical and even if it is sometime an upside down slope .
Hmm. So basically, if a slope is steep enough, you can no longer Move over it and have to Climb it. Question is, how steep it should be to count as 'vertical'? I mean, a top-heavy mini can actually topple on a surface that has a really small angle, like 20°, but you won't deem it impassable without climbing. Is 45° a good threshold?
That's really up to the people playing on the table, or what the event organizer decrees. I mean people play 40k and Warmachine with styrofoam sheet hills with carved sides that they pretend are "gently sloped hills", and sometimes you'll those players use dice or wedges between a model and a slope to prevent a model from falling over. So it really comes down to "Is that thing supposed to be a hill that you can walk across?"
I'll echo that there are only two surfaces in Infinity: Horizontal and Vertical. If it isn't Horizontal, it is Vertical. Infinity is, when you come down to it, a game of cylinders and rectangular prisms. The rules don't technically countenance anything other than perfectly perpendicular surfaces. Consequently, for practical purposes you treat everything "as if" it is either Horizontal or Vertical. This can sometimes come down to whether the surface can support a model's base, but not always. Look at Ladders, for example. Ladders are essentially a Vertical surface that is treated "as if" it were Horizontal for the purposes of movement. Nothing in the game rules, so far as I am aware, really says explicitly that the underside of a bridge is a Vertical surface, but it is certainly a simple extrapolation from the idea in the rules that a Vertical surface is one that cannot literally support a model in the way that models interact with terrain, i.e. the terrain must 'fully support' the model's base. In other words, the curved part of your model's cylinder is not the part that contacts a surface. It is the flat part. So when a model climbs a Vertical surface, its base is placed in contact with that surface; a surface which cannot physically support the model, hence you must use some manner of reference. Because of this, treating the underside of a bridge as a Vertical surface does not require that you do anything with your models that you are not already doing.
