GLua - Remove Entity on Floor Contact

glua_remove_entity_on_floor_contact.lua

if SERVER then
	local function spawn_ent(pos)
		local ent = ents.Create("prop_physics")
		ent:SetModel("models/hunter/blocks/cube05x05x05.mdl")
		ent:SetPos(pos)
		ent:Spawn()

		-- Make use of the `PhysicsCollide` callback to know when entity collides
		ent:AddCallback("PhysicsCollide", function(self, data)
			-- Check if the colliding entity is the world (`Entity(0)`) and how steep the surface is
			-- The lower the number, the flatter the surface must be to consider it a 'floor'
			if data.HitEntity == Entity(0) and data.HitNormal.z < -0.6 then
				self:Remove()
			end
		end)
	end

	-- If we press E, spawn a prop 200 units above the ground relative to where we're looking
	hook.Add("KeyPress", "", function(ply, bind)
		if ply ~= Entity(1) or bind ~= IN_USE then return end
		spawn_ent(ply:GetEyeTrace().HitPos + Vector(0, 0, 200))
	end)
end