tutorials

[webhead]

hello im new to this programming stuff ,can anyone point me in the direction of lots of basic tutorials for me to try please.

 

engine looks great,seems pretty easy but then im only mucking around at the moment , need to learn something so can you help thanks.

 

and hello to all..

[Roland]

There are some very nice Lua tutorials by Aggror here

http://www.leadwerks.com/werkspace/page/Documentation/LE2/tutorials/_/programming/lua/

[Richard Simpson]

And a main link to the rest of the tutorials. http://www.leadwerks.com/werkspace/page/documentation

[VeTaL]

Continuing tutorials theme: http://www.leadwerks.com/werkspace/page/Documentation/LE2/tutorials/_/artwork/tools/

[LandsHeer]

Hey guys,

 

I think this is the right Thread so I dont have to create a new one ^^

 

I started on the lua tutorials here and stuck at the Lightning section. I wrote it exactly like it is in there but the script editor is giving me following error:

 

attempt to index global 'cube' (a nil value)

 

anyway, here is the code I have in the script editor:

-- Register the abstract path
RegisterAbstractPath("")

--Set a graphics mode
Graphics(800,600)

--Create a framework object

fw = CreateFramework()

--set the camera

camera = fw.main.camera
camera:SetPosition(Vec3(0,2,-10))

--Create a cube
cube: CreateCube() 
cube: SetPosition(Vec3(0,1,0)) 
cube: SetScale(Vec3(2,2,2))

--Create ground
cube:CreateCube()
cube:SetPosition(Vec3(0,-2,0))
cube:SetScale(Vec3(20,1,20))

--Create a light
light=CreateSpotLight(8)
light:SetPosition(Vec3(0,3,0))
DebugLights (1)


-- Create the main loop

while AppTerminate() == 0 

do

-- Rotate the cube every frame by 0.1 in every direction
cube:Turn(Vec3(0.1,0.1,0.1))

fw:Render()
fw:Render()

Flip(0)

end

[macklebee]

should be:

cube = CreateCube() 

 

call the ground a different variable or it will rotate the ground in the main loop. also, the main loop should have one 'fw:Update()' and one 'fw:Render()', not two 'fw:Render()'.

[LandsHeer]

Ah ok yea i thought so about the two Render(). Then the tutorial has some small mistakes in it heh

[LandsHeer]

Hey guys,

 

got another problem with one of the lua tutorials, I went through the Camera Control tutorial and wrote the code in the script editor exactly like it is in the pdf. When I run the code now, the camera does rotate like crazy, but I dont know what the problem could be...

 

hope someone can help me here:

 

--Include the engine_const.lua file for keyboard input 
require("Scripts/constants/engine_const")

--registering the abstract path
RegisterAbstractPath("")

--Set a graphics mode
Graphics(800,600)

--Framework object 
fw = CreateFramework()

--Set camera 
camera = fw.main.camera 
camera:SetPosition(Vec3(0,1,-5))

--Create directionallight 
light1 = CreateDirectionalLight() 
light1:SetRotation(Vec3(45,45,0))

--Load a mesh 
scene = LoadMesh("abstract::scene.gmf")
if scene == nil then 
Notify("Failed to load scene.gmf") 
end

--Move the mouse to the center of the screen and hide it 
MoveMouse(GraphicsWidth()/2,GraphicsHeight()/2) 
HideMouse(1) 
camrotation=Vec3(0)

--Main loop 
while KeyDown(KEY_ESCAPE)==0 do

--Camera rotation 
gx=Curve(MouseX() - GraphicsWidth() /2, 
gx, 10) gx=Curve(MouseX() - GraphicsWidth() /2, 
gx, 10) gy=Curve(MouseY() - GraphicsHeight() /2, gy, 10) 
camrotation.x = camrotation.x + gy / 10 
camrotation.y = camrotation.y - gx / 10 
camera:SetRotation(camrotation,1)

--Camera movement 
move = Curve(KeyDown(KEY_W) - KeyDown(KEY_S), move, 10) 
strafe = Curve(KeyDown(KEY_D) - KeyDown(KEY_A), strafe, 10) 
camera:Move(Vec3(move/10, 0, strafe/10))

fw:Update() 
fw:Render()

Flip(0)

end

[Canardia]

These lines look at bit wierd:

gx=Curve(MouseX() - GraphicsWidth() /2, 
gx, 10) gx=Curve(MouseX() - GraphicsWidth() /2, 
gx, 10) gy=Curve(MouseY() - GraphicsHeight() /2, gy, 10) 

It should be:

gx=Curve(MouseX() - GraphicsWidth ()/2, gx, 10)
gy=Curve(MouseY() - GraphicsHeight()/2, gy, 10)

[LandsHeer]

thx for your help metatron,

 

but when i run the script the mouse look is very very very sensitive, so when that the mouse goes crazy like hell and everything is rotating very fast. So its impossible for me to see anything.

[macklebee]

try this:

require("Scripts/constants/engine_const")
require("Scripts/math/math")
RegisterAbstractPath("")
Graphics(800,600)
fw = CreateFramework()

fw.main.camera:SetPosition(Vec3(0,1,-5))

light1 = CreateDirectionalLight() 
light1:SetRotation(Vec3(45,45,0))

scene = LoadMesh("abstract::scene.gmf")

gx=Round(GraphicsWidth()/2)
gy=Round(GraphicsHeight()/2)
MoveMouse(gx,gy) 
camerapitch=fw.main.camera.rotation.x
camerayaw=fw.main.camera.rotation.y

HideMouse(1) 
while KeyDown(KEY_ESCAPE)==0 do
dx=Curve((MouseX()-gx)/4.0,dx,3.0/AppSpeed())
dy=Curve((MouseY()-gy)/4.0,dy,3.0/AppSpeed())
MoveMouse(gx,gy)
camerapitch=camerapitch+dy
camerayaw=camerayaw-dx
fw.main.camera:SetRotationf(camerapitch,camerayaw,0)

move = Curve(KeyDown(KEY_W) - KeyDown(KEY_S), move, 10) 
strafe = Curve(KeyDown(KEY_D) - KeyDown(KEY_A), strafe, 10) 
fw.main.camera:Move(Vec3(strafe/10, 0, move/10))

fw:Update() 
fw:Render()

Flip(1)
end

[LandsHeer]

cheers macklebee,

 

that works a lot better now

[Canardia]

I think 3.0/AppSpeed() is wrong, because it will amplify lag differences, so slow things get slower, and fast things get faster when the FPS changes.

I should be: 3.0*AppSpeed(), or just plain 8.0.

[LandsHeer]

ok thx I will try that out

[macklebee]

Actually by multiplying you are reducing the number of increments between the new value parameter and the old value parameter depending on if vsynch is turned on or not. With vsych on, i get roughly about 1 for AppSpeed. With it off, I get ~0.2. So with vsynch off, you get a choppy rotation which is why i used division so it would always be at least 3 increments. This might just be a poor place to use it but it was pulled from one of the SDK's inherent scripts.

 

Granted that could be resolved by simply just using a value that has nothing to do with AppSpeed. But as megatron said and according to the wiki, movement should be multiplied by appspeed but in this case it might make sense to have more increments at a higher frame rate.