[HowTo using LUA script as data file]

Sample data file [game.lua]:

return
{
   pos = {0,1,2},
   name = "player1",
   other =
	{
		items =
			{"item1","item1","item1"}
	}

}

 

 

call in code:

 

GameData = dofile("game.lua")

-- test data

print(GameData.pos[1],GameData.pos[2],GameData.pos[3])
print(GameData.name)
print(GameData.other.items[1])
print(GameData.other.items[2])
print(GameData.other.items[3])

 

Note: When your data are static, then is possible compile file to binary format: luac -o game.data game.lua, but then you don't forget change filename in your code, when output filename isn't same.

[Compile more LUA scripts ...]

Here is simple example, howto compile lua scripts into single file (good for distribution) when you can't distribute lua source.

 

Download: Sample

 

LUAC command line:

 

luac -o <output lua filename>.<your extension> <main lua script filename> <additional lua scripts #1> <additional lua scripts #2> ... <additional lua scripts #n>

 

sample:

 

luac -o main_lua.bin main_lua.lua scripts/script1.lua scripts/script3.lua scripts/script2.lua 

 

or

 

luac -o main_lua.bin main_lua.lua scripts/*.lua

 

Note: don't use script extension with require command.

[Your Desktop]

...

[save and load game]

Other option for loading data to lua from text file, is command dofile, where loaded file has format like this:

 

file "game.data":

return
{
   pos = {0,1,2},
   name = "player1",
   other =
	{
		items =
			{"item1","item1","item1"}
	}

}

 

 

then in your script call:

 

GameData = dofile("game.data")

 

 

Chceck data:

 

print(GameData.pos[1],GameData.pos[2],GameData.pos[3])
print(GameData.name)
print(GameData.other.items[1])
print(GameData.other.items[2])
print(GameData.other.items[3])

 

Benefit is, that you don't need write parser for data.

 

EDIT:

 

When you need data more secure, then compile your game data file with:

 

luac -o game.cdata game.data

 

your data are in binary format now, and simply change loading to GameData = dofile("game.cdata").

 

Note: Compiled data are good only for static data like startup setting, scene properties, addons, items descr., ...

[Emitter]

I have used same code for two emitters, difference is only in parameter CYCLEMODE, but result looks like bug, because Emitter position is moved in Velocity vector too, when is cyclemode set to 1. Is it bug? (From my point of view - yes) but I waiting for confirmation from others. Then i write bug to bugtracker, when yes.

 

Function Fire()

Local particle:TEmitter

setWorld(fw.transparency.world)

	particle = CreateEmitter(80, 500, Vec3(0, 4, 0), 0)

	particle.SetPosition(Vec3(-1, 0, 0))
	particle.SetRotation(Vec3(0, 0, 0))
	EntityColor(particle, Vec4(1, 0.5, 0.25, 0.5))
	PaintEntity(particle, LoadMaterial("abstract::fire.mat"))
	SetEmitterRadius(particle, 0.1, 0.5)
	SetEmitterRotationSpeed(particle, 0.2)

setWorld(fw.Main.world)


Local particle2:TEmitter

setWorld(fw.transparency.world)

	particle2 = CreateEmitter(80, 500, Vec3(0, 4, 0), 1)

	particle2.SetPosition(Vec3(1, 0, 0))
	particle2.SetRotation(Vec3(0, 0, 0))
	EntityColor(particle2, Vec4(1, 0.5, 0.25, 0.5))
	PaintEntity(particle2, LoadMaterial("abstract::fire.mat"))
	SetEmitterRadius(particle2, 0.1, 0.5)
	SetEmitterRotationSpeed(particle2, 0.2)				

setWorld(fw.Main.world)

End Function

 

[3D sidescroller movement]

Try this my hint:

 

- when you press move control, define movement vector for player not from model (Z axis vector), but from camera axis vectors, because camera is always oriented toward screen and looks on level/player from side when we talk about "side scroll" control.

 

Pseudo math code for movement:

 

to right/left:

Pivot_pos = Pivot_pos +/- Camera_X_axis_vetor

 

to up/down:

Pivot_pos = Pivot_pos +/- Camera_Z_axis_vetor

 

with this, player movement always looks like "side scroll", aligned to camera view.

[Terrain collision ?]

From editor set properties on your model like mass and Collision Type, when property windows is empty - add lua script with name like your model.

 

Note: Template script is in Scripts folder ("template.lua").

[Few questions on Lua/Le]

Lua 5.1 has lib table, which works like TList container: LUA Table Library

[Idea for an application]

Here is link to photoshop color operation, writed to GLSL. Photoshop math with GLSL shaders + sample crossprocessing-shader

[Palette colour filter]

Change BindTexture( palette , 1 ); to BindTexture( palette , 0 );

[Palette colour filter]

1) Look like you have assigned palette texture to TMU 1 and in you shader you have used only TMU 0.

2) shader is case sensitive, default names for TMU are texture0 - texture32, when you use BindTexture command. (Wiki: BindTexture)

[Quick question: Editor configuration]

exec lesdk.exe and update. All what was changed, will be returned to default.

[the z coordinate]

Strictly speaking - each object when is rotated, translated, ... , has oriented toward Z axis vector.

For example TurnEntity(e,Vec3(0,0,1)) - move entity in Z axis direction.

Camera works same. Your look direction is Z axis direction, oriented by actual camera/entity rotation.

[World Editor]

[error]

Globaly this talk, that you have used variable which isn't instance or isn't declared/defined in called script.

 

Try add:

 

whatever = {}

 

when 'whatever' is you variable.

[Spotlight striping]

- try change Linear offset and Multiplicative offset properties on light,

- or change light position

- or change light to static shadow

[iPhone test]

Is it extra app or WebApp for Safari? When you need more testers, I have iPhone too

[I need help with Reseive message]

Key codes are not problem, when i execute scene in Editor only with lua code (source is in post #3), then works, message is received and sent to target.

Strange for me is, why when message is sent from lua code, why isn't received in BMX code too. I don't need make response in lua, i need read this message only in main BMX code.

 

Main question is, is possible send message in LUA and RECEIVE in BMX code? I have tested SEND/RECEIVE in LUA - works, BMX too. From LUA to BMX doesn't work or i have realy issue.

 

 

EDIT: Yes, works now. key constans i had included in lua, but BMX don't execute main lua script where I had this one.

Many thanks.

[Leadwerks User Guide - LUG]

Little bug:

 

page 37: icon is in DDS file format not gmf in Example frame

[I need help with Reseive message]

Entity func_gamecontrol is now linked to this player entity in editor ...

 

require("scripts/class")

local class=CreateClass(...)


function class:InitDialog(grid)

self.super:InitDialog(grid)

end

function class:CreateObject(model)

local object=self.super:CreateObject(model)
object.model.mass = 1.0
object.classname = "player_model"
object.last_message = ""
object.receive_is_locked = 0

object.step = 0.05
object.move_step = 0
object.move_distance = 0
object.max_distance = 1.0

object.turn = 4.0
object.turn_step = 0
object.turn_angle = 0
object.max_angle = 90

object.local_y_angle=0

object.wheel_left = LoadModel("abstract::player_car_wheel.gmf")

object.wheel_right = LoadModel("abstract::player_car_wheel.gmf")


local body_pos = Vec3(0,0,0) --object.model:GetPosition()

local body_wheel_left = Vec3(body_pos.x+0.32,body_pos.y+0.25,body_pos.z)
local body_wheel_right = Vec3(body_pos.x-0.32,body_pos.y+0.25,body_pos.z)

object.wheel_right:SetPosition(body_wheel_right)
object.wheel_right:SetParent(object.model)

object.wheel_left:SetPosition(body_wheel_left)
object.wheel_left:SetParent(object.model)


end

 

and in BMX now i tried assign callback direct to target entity, which is entity with classname "player_model"

 

'LEVEL CCLASS
...

Self.Player.CreatePlayerFromLevel(Level.GetByClassName("func_gamecontrol")) ' <- return scene entity with classname="func_gamecontrol"

' PLAYER CLASS
...
Method CreatePlayerFromLevel(e:TEntity)
	Local e_player:TEntity = GetEntityTarget(e, 0)
	SetEntityCallback(e_player, Byte Ptr MyMessageReceiveCallback, ENTITYCALLBACK_MESSAGERECEIVE)
End Method

...	

End Type


Function MyMessageReceiveCallback(entity:TEntity, message:String, extra:Object)
If entity Then
	Print(message)
End If
End Function

 

I tried retype entity e_player to TBody and to TModel too. Alls with same result as before.

[I need help with Reseive message]

Isn't problem ...

 

Lua script:

 

require("scripts/class")

local class=CreateClass(...)


function class:InitDialog(grid)

self.super:InitDialog(grid)


group = grid:AddGroup("Key Binding")
group:AddProperty("key_forward", PROPERTY_STRING, "","Key Forward")
group:AddProperty("key_backward", PROPERTY_STRING, "","Key Backward")
group:AddProperty("key_turn_left", PROPERTY_STRING, "","Key Turn left")
group:AddProperty("key_turn_right", PROPERTY_STRING, "","Key Turn right")


end

function class:CreateObject(model)

local object=self.super:CreateObject(model)

object.classname = "func_gamecontrol"

-- default key binds
object.key_forward = "KEY_UP"
object.key_backward = "KEY_DOWN"
object.key_turn_left = "KEY_LEFT"
object.key_turn_right = "KEY_RIGHT"


function object:SetKey(key,value)
	if key=="key_forward" then object.key_forward = value
	elseif key=="key_backward" then object.key_backward = value
	elseif key=="key_turn_left" then object.key_turn_left = value
	elseif key=="key_turn_right" then object.key_turn_right = value
	else
		return self.super:SetKey(key,value)
	end
	return 1
end



function object:GetKey(key,value)
	if key=="key_forward" then return object.key_forward
	elseif key=="key_backward" then  return object.key_backward
	elseif key=="key_turn_left" then  return object.key_turn_left
	elseif key=="key_turn_right" then  return object.key_turn_right

	else
		return self.super:GetKey(key,value)
	end
	return value
end




function object:Update()
	if GetGlobalString("LE_Environment_mode") == "ENV_MODE_GAME" then
		t = model:GetTarget(0)
		if KeyHit(_G[object.key_forward])==1 then
			t:SendMessage("move_forward")
			AppLog("move_forward")
		end
		if KeyHit(_G[object.key_backward])==1 then t:SendMessage("move_backward") end
		if KeyHit(_G[object.key_turn_left])==1 then t:SendMessage("turn_left") end
		if KeyHit(_G[object.key_turn_right])==1 then t:SendMessage("turn_right") end
	end
end



end

 

BMX part:

 

...

SetEntityCallback(Target, Byte Ptr MyMessageReceiveCallback, ENTITYCALLBACK_MESSAGERECEIVE)

...

Function MyMessageReceiveCallback(entity:TEntity, message:String, extra:Object)
If Entity Then
	Print(message)
End If
End Function

 

where Target is target entity linked to player entity in editor and readed to from func_gamecontrol entity.

[I need help with Reseive message]

I have created entity function with send message method to target object. Now i need receive this message but from BMX.

 

Note: When I tried send/receive message only with LUA - works very good. But send message from lua and receive to bmx doesn't work for me.

 

Any ideas?

[Object properties question]

I had same problem, ... because i forgot add functions for read and write values for user defined properties. Here is part of my code. I think that help you.

 

function class:InitDialog(grid)

self.super:InitDialog(grid)

group = grid:AddGroup("GameProperties")
group:AddProperty("classname", PROPERTY_STRING, "classname")


group = grid:AddGroup("Key Binding")
group:AddProperty("key_forward", PROPERTY_STRING, "KEY_UP","Key Forward")
group:AddProperty("key_backward", PROPERTY_STRING, "","Key Backward")
group:AddProperty("key_turn_left", PROPERTY_STRING, "","Key Turn left")
group:AddProperty("key_turn_right", PROPERTY_STRING, "","Key Turn right")


end

function class:CreateObject(model)

local object=self.super:CreateObject(model)

object.classname = "func_gamecontrol"

-- default key binds
object.key_forward = "KEY_UP"
object.key_backward = "KEY_DOWN"
object.key_turn_left = "KEY_LEFT"
object.key_turn_right = "KEY_RIGHT"



function object:SetKey(key,value)
	if key=="classname" then
		object.classname = value
	elseif key=="key_forward" then object.key_forward = value
	elseif key=="key_backward" then object.key_backward = value
	elseif key=="key_turn_left" then object.key_turn_left = value
	elseif key=="key_turn_right" then object.key_turn_right = value
	else
		return self.super:SetKey(key,value)
	end
	return 1
end



function object:GetKey(key,value)
	if key=="classname" then
		return object.classname
	elseif key=="key_forward" then return object.key_forward
	elseif key=="key_backward" then  return object.key_backward
	elseif key=="key_turn_left" then  return object.key_turn_left
	elseif key=="key_turn_right" then  return object.key_turn_right

	else
		return self.super:GetKey(key,value)
	end
	return value
end

       ...

[Timing question]

Use AppSpeed() for same speed on different PC.

 

More here: AppSPeed()

[Introducing Models Tutorial]

A few days ago I found,that when exist ini file and lua in same folder as model, then collision doesn't work. Try remove ini file (it's old feature) and add your setup only to lua.