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 Determining whether something is underground 
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Joined: Sun Oct 29, 2006 4:26 am
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Post Determining whether something is underground
More questions! Is there a way you can tell whether something's underground or not? I know Zalo's diggerator had something to check that, but I cannot make hide or tails of it and it also doesn't work in this version. Any ideas?


Wed Sep 19, 2012 5:12 am
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Post Re: Determining whether something is underground
You can cast a ray upwards, and if it collides with terrain the point you cast the ray from is probably under ground.


Wed Sep 19, 2012 9:53 am
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Post Re: Determining whether something is underground
Alternatively, you could cast a fan of 3 or so rays to avoid hitting a single piece of debris or seeing if a character is standing in a doorway. However, I am not sure if this would too computationally intensive for too little gain.


Wed Sep 19, 2012 1:22 pm
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Post Re: Determining whether something is underground
If you wanted to find if something just doesn't have line of sight to the air as a way of measuring "underground-ness", theoretically you could also do something like

Code:
if SceneMan:CastStrengthSumRay(self.Pos,SceneMan:MovePointToGround(Vector(self.Pos.X,0),1,1),0,128) >= 5 then
  --You are under at least 5 strength units worth of terrain (admittedly not much, you could adjust that), do stuff
else
  --You are under only a small bit of scrap or nothing, aka above ground, do other stuff
end


Haven't tested it, but this would likely work with overhangs and/or tall ceilings. Would still have the issue of only being a single ray and therefore not noting if you're in say a doorway.
Would also probably be terrible for deep levels, so you might want to do something like this instead:

Code:
local foundGround = SceneMan:MovePointToGround(Vector(self.Pos.X,0,1);
if SceneMan:GetShortestDistance(self.Pos,foundGround,false) > 800 then
   if SceneMan:CastStrengthSumRay(self.Pos,foundGround,1,1),0,128) >= 5 then
      --You are under at least 5 strength units worth of terrain (admittedly not much, you could adjust that), do stuff
   else
      --You are under only a small bit of scrap or nothing, aka above ground, do other stuff
   end
else
   --Use one of the other ways to check if underground I guess, or maybe do a check not from the sky (so you'd do SceneMan:MovePointToGround(Vector(self.Pos.X,math.min(self.Pos.Y + 500,SceneMan.SceneHeight/2),1) or something like that)
end


Maybe this is overcomplicating things though..


Wed Sep 19, 2012 8:30 pm
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Post Re: Determining whether something is underground
For future lua explorers:
Code:
SceneMan:FindAltitude(Pos, 0,0);

Returns offset in relation to highest piece of terrain at Pos.


Sat Sep 29, 2012 4:48 am
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