Lua Programming Help Thread

[andyauff]

I am trying to get TP's tutorial in the GDI thread for 3D to work, but it's not. Here is the code:

red = Color.new(255,0,0)

pad = Controls.read()


while true do

Gu.start3d()

Gu.clearDepth(0);
Gu.clear(Gu.COLOR_BUFFER_BIT+Gu.DEPTH_BUFFER_BIT)

Gum.matrixMode(Gu.PROJECTION)
Gum.loadIdentity()
Gum.perspective(50, 16/9, 0.5, 1000)

Gum.matrixMode(Gu.VIEW)
Gum.loadIdentity()

walls = {

{red, 3, -2, 4},
{red, 2, -2, 5},
{red, 2, -2, 5},

{red,-1,1,-1},
{red,-1,0,-1},
{red,-1,0,3},

{red,-1,1,-1},
{red,-1,0,3},
{red,-1,1,3},

{red,-1,1,3},
{red,-1,0,3},
{red,-1,0,6},

{red,-1,1,3},
{red,-1,0,6},
{red,-1,1,6},

{red,-1,1,6},
{red,-1,0,6},
{red,-1,0,10},

{red,-1,1,6},
{red,-1,0,10},
{red,-1,1,10},

{red,10,0,3},
{red,10,0,-1},
{red,10,1,-1},

{red,10,1,3},
{red,10,0,3},
{red,10,1,-1},

{red,10,0,6},
{red,10,0,3},
{red,10,1,3},

{red,10,1,6},
{red,10,0,6},
{red,10,1,3},

{red,10,0,10},
{red,10,0,6},
{red,10,1,6},

{red,10,1,10},
{red,10,0,10},
{red,10,1,6},

{red,10,0,-1},
{red,6,0,-1},
{red,10,1,-1},

{red,10,1,-1},
{red,6,0,-1},
{red,6,1,-1},

{red,6,0,-1},
{red,3,0,-1},
{red,6,1,-1},

{red,6,1,-1},
{red,3,0,-1},
{red,3,1,-1},

{red,3,0,-1},
{red,-1,0,-1},
{red,3,1,-1},

{red,3,1,-1},
{red,-1,0,-1},
{red,-1,1,-1},

{red,10,1,10},
{red,6,0,10},
{red,10,0,10},

{red,6,1,10},
{red,6,0,10},
{red,10,1,10},

{red,6,1,10},
{red,3,0,10},
{red,6,0,10},

{red,3,1,10},
{red,3,0,10},
{red,6,1,10},

{red,3,1,10},
{red,-1,0,10},
{red,3,0,10},

{red,-1,1,10},
{red,-1,0,10},
{red,3,1,10},

}

Gum.matrixMode(Gu.MODEL)
Gum.loadIdentity()
Gum.translate(1,1,1);
Gu.disable(Gu.TEXTURE_2D)
Gum.drawArray(Gu.TRIANGLES, Gu.COLOR_8888+Gu.VERTEX_32BITF+Gu.TRANSFORM_3D, walls)

Gu.end3d()

screen.waitVblankStart()
screen.flip()
end

What's wrong with that? I'm interested in learning some 3D but I can't if I'm stuck here! Thanks for any help.

[michaelp]

have you tested it? what line does it give you an error at? what's the error
it'll help if you tell us those things

[sjheiss]

I need help on reading files. I know how to read a starting from a certain point, string.sub(mystring,9,12) , but I want to know how I can start on a specific line, like 8, or 17 or w/e.

[andyauff]

Right...it just shows a blank (grey) screen.

[emericaska8r]

Right...it just shows a blank (grey) screen.

you can't have screen.flip() and screen.waitVblankStart() in the gu.
take those out and see if it works now :Punk:
-= Double Post =-
i tried it on windows luaplayer but it doesn't show anything both times, so i'm guessing it just doesn't support the gu on the computer... i think it should work now though...

[michaelp]

i went through the tutorials at evilmana, look at some at the Tutorial Directory and done some experimenting with lua
are there any other tutorials? where should i go now

[myschoo]

try experiment :)

[youresam]

i went through the tutorials at evilmana, look at some at the Tutorial Directory and done some experimenting with lua
are there any other tutorials? where should i go now

http://lua-users.org/wiki/TutorialDirectory

Is all you should ever need.

[andyauff]

Thanks for the help, emericaska8er, but that wasn't the problem. You do need those in there. I think it was just because I had the array inside the main loop...now it is outside of it.
-= Double Post =-
Okay, new question: Is there any program where I can "draw" objects and it'll tell me the numbers for it? Or is it just sort of "guess and check"?

[TacticalPenguin]

Elaborate on what you want to do.

[andyauff]

Draw 3D objects in lua...I understand your tutorial, but how did you get those numbers for the walls? Did you just sort of "guess and check" or is there a program where I can make the 3D objects and it'll spit out the coordinates?

[TacticalPenguin]

http://pspupdates.qj.net/L3D-3D-Mode...g/49/aid/82009
edit: for those walls I figured it out in my head.

Oh and dl the one for 1.5

[youresam]

For all my 3D models I do it in notepad, no guess-and-check at all ;)

[andyauff]

Yeah, TP I already had that on my memory stick...and I thought about trying it, too! Thanks for the great program...do you plan to update it any further?

[TacticalPenguin]

Not right now. I think Blah is working on a major redo of it though.

[andyauff]

That's cool.

[Mistabeen]

Just startedlooking into LUA (total newb ) and trying to do some tutorials to learn the code
but I got a small problem, I'm using LuaDevKit (but I get the same problem with LUA player for windows) and ofcourse I started out with the pure basics, hello world :)
but when I testrun it, it just flashes the screen and closes again, how do I make it stay open so i can see the result?

arfgh, forget what i just said -_- just found it

[vision1]

Hey there

ok? This is what i need
i need 15-25 small images (around 5 types) to scroll from the right to left
and i want it to blit random images.

What im trying to do is scroll buttons pics from right to left and when they hit the box in the middle you have to press the corresponding button.


so far i got this

Spoiler for Code:

-- Variables
red = Color.new(255,0,0)
white = Color.new(255,255,255)
green = Color.new(0,255,0)
state = 1
background = Image.load("images/background.png")





triangle = Image.load("images/triangle.png")
circle = Image.load("images/circle.png")
cross = Image.load("images/cross.png")
square = Image.load("images/square.png")
right = Image.load("images/right.png")
r = math.random(1,5)



score = 0
level = 0

--table for image
Buttons = {}
Buttons[1] = { x = 300, y = 120 }
Buttons[2] = { x = 260, y = 120 }


-- Menu Function
function menu()
screenrint(150,0, "Press X to Start", red)
screenrint(152,10, "Press O to Quit", red)
end

-- Game Function
function game()
while true do
screen:clear()
Image:blit(0,0,background )
speed = 4
screenrint(0,0, "Score :" .. score, green)
screenrint(0,10, "Level :" .. level, green)

Image:blit(Buttons[1].x,Buttons[1].y, triangle )
Image:blit(Buttons[2].x,Buttons[2].y,circle)
Buttons[1].x = Buttons[1].x - speed
Buttons[2].x = Buttons[2].x - speed
if Buttons[1].x == 0 then Buttons[1].x = 472
end
if Buttons[2].x == 0 then Buttons[2].x = 472
end
screen.waitVblankStart()
screen.flip()
end
end



while true do
pad = Controls.read()
screen:clear()


if state == 1
then menu()
end
if state == 2
then game()
end


--Menu
if state == 1 and pad:cross()
then state = state + 1 elseif state == 1 and pad:circle()
then break
end


screen.waitVblankStart()
screen.flip()
end

Not much :/

Who ever replies, please dont just tell me the code can you briefly explain? Thanks in advance

[JaSo PsP]

Hey there

ok? This is what i need
i need 15-25 small images (around 5 types) to scroll from the right to left
and i want it to blit random images.

What im trying to do is scroll buttons pics from right to left and when they hit the box in the middle you have to press the corresponding button.


so far i got this

Spoiler for Code:

-- Variables
red = Color.new(255,0,0)
white = Color.new(255,255,255)
green = Color.new(0,255,0)
state = 1
background = Image.load("images/background.png")





triangle = Image.load("images/triangle.png")
circle = Image.load("images/circle.png")
cross = Image.load("images/cross.png")
square = Image.load("images/square.png")
right = Image.load("images/right.png")
r = math.random(1,5)



score = 0
level = 0

--table for image
Buttons = {}
Buttons[1] = { x = 300, y = 120 }
Buttons[2] = { x = 260, y = 120 }


-- Menu Function
function menu()
screenrint(150,0, "Press X to Start", red)
screenrint(152,10, "Press O to Quit", red)
end

-- Game Function
function game()
while true do
screen:clear()
Image:blit(0,0,background )
speed = 4
screenrint(0,0, "Score :" .. score, green)
screenrint(0,10, "Level :" .. level, green)

Image:blit(Buttons[1].x,Buttons[1].y, triangle )
Image:blit(Buttons[2].x,Buttons[2].y,circle)
Buttons[1].x = Buttons[1].x - speed
Buttons[2].x = Buttons[2].x - speed
if Buttons[1].x == 0 then Buttons[1].x = 472
end
if Buttons[2].x == 0 then Buttons[2].x = 472
end
screen.waitVblankStart()
screen.flip()
end
end



while true do
pad = Controls.read()
screen:clear()


if state == 1
then menu()
end
if state == 2
then game()
end


--Menu
if state == 1 and pad:cross()
then state = state + 1 elseif state == 1 and pad:circle()
then break
end


screen.waitVblankStart()
screen.flip()
end

Not much :/

Who ever replies, please dont just tell me the code can you briefly explain? Thanks in advance

What do you want people to briefly explain, you've told us the game you want to make, and showed us you code. What now? Are there any problems that need solving?.

PS: You gon eat that random number? cos if u dont want it...

[michaelp]

shouldn't you have this at the top of your code:

math.randomseed(os.time())

so it's the not the same random number each time?

[vision1]

Sorry, what i need to know is what would i do to print around 25 random images without having to type

screenrint(...
screenrint(...
screenrint(...
screenrint(...
screenrint(...
screenrint(...
screenrint(...
screenrint(...
screenrint(...

[yaustar]

Store all the images in a table, then use a loop to print all the images.

[Kazart]

I use copy paste, but tables and all that stuff are way more organized. I just take the lazy way out, but pay for it in the end when I can't find anything...

[SG57]

Copy and paste? What happens when you need to display an undetermined amount of images? Say you read in all the images from the PHOTO folder.

As yaustar said

images = {}
for i = 1, 25 do
    images[i] = Image.load("image" .. i .. ".png")
end

exit = false

while ~exit do
    for i = 1, 25 do
        screen:blit(some X value, some y value, images[i])
    end

    screen.waitVblankStart()
    screen.flip()
end

When you say 'random image', im confused. Also I'm unsure what your image sizes are and whether they should replace one another after displaying.

[slicer4ever]

i think he means display a random image in which case a small change to sg;s code:

images = {}
for i = 1, 25 do
    images[i] = Image.load("image" .. i .. ".png")
end

exit = false

while ~exit do
    screen:blit(0, 0, images[random(25)])
    screen.waitVblankStart()
    screen.flip()
end

i believe random is the name for the random function in lua although since it's been a long time since i coded in lua

[vision1]

Thanks guys

By random i mean like

pictures of buttons

X O X LEFT RIGHT R1 L1 UP DOWN X X O <<not in specific order which scroll from right to left

[SG57]

That is much more then a snippet.

I might do it in the morning (im about to go to sleep, it's 1:20 AM here...) but I think you'd get a great learning experience should you create it yourself....

[FaT3oYCG]

he is asking you yo create his first lua program for him like the one everyone tells you to do when your trying to learn lua?????

do it yourself or go find one that someone has made how do you expect to learn

[Mistabeen]

Could someone take a look at this code, for some reason I get in my Debug (working with LuaDevKit)
Exit Value: 1
usage: luaplayer script.lua

If I open another script it opens just fine, so I guess I must be not seeing something that is probably so obvious

Spoiler for Lua code:

-- colors --
red= Color.new(255,0,0)
green= Color.new(0,255,0)
white= Color.new(255,255,255)
yellow= Color.new(255,226,40)

-- Timer --
counter = Timer.new()
counter:start()

-- images --
bighit= Image.load("bighit.png")

-- music table --
notes={}
notes[1]={time=5000,note=1}
notes[2]={time=7000,note=1}
notes[3]={time=10000,note=1}
notes[4]={time=12000,note=1}

-- vars --
oldpad = Controls.read()

-- Main loop --
while true do
pad = Controls.read()
screen:clear()
currentTime = counter:time()

screen:blit(50,50,bighit)


screen.waitVblankStart()
oldpad=pad
screen.flip()
end

-= Double Post =-
I eventualy found what was wrong, for some reason my filename was to big kinda silly

I've got another problem tho
is there any decent soundsupport for LUA? or is there a way to preload my musicfiles, or is there a way to reset my timer as soon as the music starts playing.
Right now I had to use wav for my music (.xm file was the worst thing ever) and that plays, only problem is there is a delay and I need my music to be in perfect sync with my timer.

[vision1]

Guys chill out.
I didnt mean for you to write the whole code. I just asked how would i go about doing so and so that's why i asked that you dont just give me the code but also explain. Im not into copying and pasteing and i really do want to learn.