95 lines
3.0 KiB
Lua
Executable File
95 lines
3.0 KiB
Lua
Executable File
local min = math.min
|
|
local abs = math.abs
|
|
|
|
function steampunk_blimp.physics(self)
|
|
local friction = 0.996
|
|
local vel=self.object:get_velocity()
|
|
-- dumb friction
|
|
if self.isonground and not self.isinliquid then
|
|
--minetest.chat_send_all("with friction")
|
|
vel = {x=vel.x*friction,
|
|
y=vel.y,
|
|
z=vel.z*friction}
|
|
self.object:set_velocity(vel)
|
|
end
|
|
|
|
-- bounciness
|
|
if self.springiness and self.springiness > 0 then
|
|
local vnew = vector.new(vel)
|
|
|
|
if not self.collided then -- ugly workaround for inconsistent collisions
|
|
for _,k in ipairs({'y','z','x'}) do
|
|
if vel[k]==0 and abs(self.lastvelocity[k])> 0.1 then
|
|
vnew[k]=-self.lastvelocity[k]*self.springiness
|
|
end
|
|
end
|
|
end
|
|
|
|
if not vector.equals(vel,vnew) then
|
|
self.collided = true
|
|
else
|
|
if self.collided then
|
|
vnew = vector.new(self.lastvelocity)
|
|
end
|
|
self.collided = false
|
|
end
|
|
--minetest.chat_send_all("vnew")
|
|
self.object:set_velocity(vnew)
|
|
end
|
|
--[[else
|
|
self.object:set_pos(self.object:get_pos())
|
|
if not self.isonground then
|
|
--minetest.chat_send_all("test")
|
|
self.object:set_velocity(vel)
|
|
end
|
|
end]]--
|
|
|
|
--buoyancy
|
|
local surface = nil
|
|
local surfnodename = nil
|
|
local spos = airutils.get_stand_pos(self)
|
|
spos.y = spos.y+0.01
|
|
-- get surface height
|
|
local snodepos = airutils.get_node_pos(spos)
|
|
local surfnode = airutils.nodeatpos(spos)
|
|
while surfnode and (surfnode.drawtype == 'liquid' or surfnode.drawtype == 'flowingliquid') do
|
|
surfnodename = surfnode.name
|
|
surface = snodepos.y +0.5
|
|
if surface > spos.y+self.height then break end
|
|
snodepos.y = snodepos.y+1
|
|
surfnode = airutils.nodeatpos(snodepos)
|
|
end
|
|
|
|
local new_velocity = nil
|
|
|
|
local accell = {x=0, y=0, z=0}
|
|
self.water_drag = 0.1
|
|
self.object:move_to(self.object:get_pos())
|
|
local time_correction = (self.dtime/steampunk_blimp.ideal_step)
|
|
local y_accel = self._baloon_buoyancy*time_correction
|
|
if surface then
|
|
self.isinliquid = true
|
|
local height = self.height
|
|
local submergence = min(surface-spos.y,height)/height
|
|
-- local balance = self.buoyancy*self.height
|
|
local buoyacc = airutils.gravity*(self.buoyancy-submergence)
|
|
--local buoyacc = self._baloon_buoyancy*(self.buoyancy-submergence)
|
|
accell = {x=-vel.x*self.water_drag,y=buoyacc-(vel.y*abs(vel.y)*0.4),z=-vel.z*self.water_drag}
|
|
--local v_accell = {x=0,y=buoyacc-(vel.y*abs(vel.y)*0.4),z=0}
|
|
airutils.set_acceleration(self.object,accell)
|
|
if self._baloon_buoyancy > 0 then
|
|
airutils.set_acceleration(self.object,{x=0,y=y_accel,z=0})
|
|
end
|
|
else
|
|
self.isinliquid = false
|
|
if self._baloon_buoyancy == 0 then
|
|
local velocity = vector.new(vel)
|
|
velocity.y = velocity.y - (velocity.y/100)
|
|
self.object:set_velocity(velocity)
|
|
end
|
|
--minetest.chat_send_all("_baloon_buoyancy: "..self._baloon_buoyancy.." - dtime: "..self.dtime.." - ideal: "..steampunk_blimp.ideal_step)
|
|
airutils.set_acceleration(self.object,{x=0,y=y_accel,z=0})
|
|
end
|
|
|
|
end
|