[SOLVED] Checking for closest face of a part to the ground

[faint totem]

how can i determine which face of a part is the closest to the ground/baseplate?

[lethal river]

is the ground flat or does it have hills/other stuff that makes it not be a flat plain?

[faint totem]

flat

a baseplate part

[lethal river]

I've to do some googling to find the exact steps, but it comes down to looking at the baseplate's rotation, and running to formula

RB = slope co. baseplate, RL = slope co. Line
RB *RL = -1

just have look up how to do the math to find the shortest path again

give me a second

oh right, it comes down to just filling out y = Mx + B

Yet of course you will have to sadly translate this math to work in a 3d work space. Yet that shouldn't be a real issue. The main thing you can do afterwards is just dependent on how you manage the face logic. You can either base it off of the different between the slop co. and the forwards vector of the shape. Or just rotate the object so the rotations match (depending of if you just wish to identify the right face, or make sure it's the right face)

[faint totem]

ill try this

thanks

[lethal river]

I actually went and found a tutorial actually explaining how to do it in 3d https://www.youtube.com/watch?v=5BDrdI3rdQY. Main limitation with this is of course that this mostly works for (almost) spherical objects. so if you start using some very odd shapes then it may select the wrong face

[faint totem]

thank you

[lethal river]

stuff like this will be it's main downfall

[faint totem]

solved