Need help with lua? - LunaLua General Help

[HenryRichard]

Though if you're going to use math.random you should put math.randomseed(os.time()) at the beginning of your code. You could also just use rng.lua, which is "more random" and is generally more useful.

[PixelPest]

Though if you're going to use math.random you should put math.randomseed(os.time()) at the beginning of your code.

Or you could use RNG

[HenryRichard]

Yeah... just like I said...

[Emral]

Yeah... just like I said...

I don't see the point in trying to salvage math.random's functionality if using rng is just so much easier.

Code: Select all

local rng = API.load("rng")
local randomVariable = rng.random(1, 10)

http://wohlsoft.ru/pgewiki/Rng.lua

[HenryRichard]

Is there an easy-ish way I could render a bunch of sprites in 3-Dimensional space? I want some that face the camera and some that have a fixed orientation (that is, they don't move with the camera), though I can make do with only the former.

[Quantumenace]

Sort of. To manipulate a sprite like that you can draw a pair of triangles that use the sprite graphic as a texture. Not sure if you can load the default gif images like that though, it says only to use png.

Edit:Oops, I forgot you already made the level with spinning planets so you know that already. What type of rotation do you mean, is it like a parallax thing?

[HenryRichard]

I don't think you understand what I mean. I want to make a 3D space and draw sprites in it. I'm sure it would utilize some OpenGL functions, though I'm really not sure how to go about it.

[Quantumenace]

If you're asking whether the GL functions actually have support of x,y,z coordinates I have no idea. My point is, you can get a 3D perspective by applying a parallax transform to your coordinates.

Code: Select all

angle = 0
bb = Graphics.loadImage("bb.png")

function onCameraUpdate()
local cam = Camera.get()[1]; local x0 = cam.x+0.5*cam.width; local y0 = cam.y+0.5*cam.height
local basedepth = 1000
local priority = -96
local texture = bb
local w,h = 128,128
angle=angle+math.pi/90; if angle > math.pi then angle = angle -2*math.pi end
local s = math.sin(angle); local c = math.cos(angle)
local wc = 0.5*w*c; local ws = 0.5*w*s; local hc = 0.5*h*c; local hs = 0.5*h*s
local x,y,z=-199280,-200288,256

local xyz = {x-wc,y+0.5*h,z-ws,x+wc,y+0.5*h,z+ws,x+wc,y-0.5*h,z+ws,
			x-wc,y+0.5*h,z-ws,x-wc,y-0.5*h,z-ws,x+wc,y-0.5*h,z+ws}
local xy = {}

for i=1,#xyz,3 do
	z=math.max(xyz[i+2],-basedepth+.01)
	table.insert(xy,0.5*cam.width+(xyz[i]-x0)*basedepth/(z+basedepth))
	table.insert(xy,0.5*cam.height+(xyz[i+1]-y0)*basedepth/(z+basedepth))
end

	local txs = {0,1,1,1,1,0,0,1,0,0,1,0}

	Graphics.glDraw{texture=texture, textureCoords=txs,vertexCoords=xy, priority=priority}
end

[Hoeloe]

If you're asking whether the GL functions actually have support of x,y,z coordinates I have no idea.

They don't. I was, however, working on a 3D renderer a while ago, but it was too slow to be of any use. I got rid of all the old videos I had of it, but it was very basic. Essentially I could load in a .obj file and move it around a 3D scene, but more than about 200 triangles dropped the framerate far too much to be useful.

[HenryRichard]

You wouldn't happen to have any of that code anymore, would you? I probably won't be needing anywhere near 200 triangles for what I'm doing (probably 50 at most) and I may be able to salvage it.

[Hoeloe]

You wouldn't happen to have any of that code anymore, would you? I probably won't be needing anywhere near 200 triangles for what I'm doing (probably 50 at most) and I may be able to salvage it.

Ehhh... it has other problems as well. I still have the library around somewhere, but it's not designed for layering sprites, more for actual perspective 3D projection. Think N64.

[pal4]

I tried to pull off a lunalua code for a real red birdo complete with behavior from Pge wiki. It uses a "simple" lunalua code to make Birdo randomly shoot fireballs in place of eggs. The code looks like this:
local hasGenerated = false;
local ran;

function onLoop()
tableOfBirdo = NPC.get(39, -1);
tableOfBirdoEggs = NPC.get(40, -1);

if(tableOfBirdo[1] ~= nil) then
if(tonumber(tableOfBirdo[1]:mem(0xF0, FIELD_DFLOAT)) == 1) then
if(hasGenerated ~= true) then
ran = math.random(0, 2);
hasGenerated = true;
end
if(ran == 2) then
if(table.getn(tableOfBirdoEggs) > 0) then
tableOfBirdoEggs[table.getn(tableOfBirdoEggs)].id = 282;
playSFX(42);
end
end
end
if(tonumber(tableOfBirdo[1]:mem(0xF8, FIELD_DFLOAT)) == 280) then
hasGenerated = false;
end
end
end
Unfortunately, Birdo is only changed visually; his behavior isn't changed in any way. He still shoots nothing but eggs. Even after copying and pasting the proper code (the downloaded code looks nothing like this), constantly saving my level with the code, and trying to update smbx to match the version of lunalua, still nothing changes!

[HenryRichard]

Show us a screenshot of the folder that the level is in.

[pal4]

Show us a screenshot of the folder that the level is in.

How do I do that?

[PixelPest]

Show us a screenshot of the folder that the level is in.

How do I do that?

Use snipping tool, another screenshot tool, or the "Print Screen" button on your keyboard to take a screenshot of the folder the level it's in and then upload it to imgur.com

[pal4]

Use snipping tool, another screenshot tool, or the "Print Screen" button on your keyboard

Unfortunately I don't have any tools in my folders and no printer. So I can't do any of those.

[Emral]

Use snipping tool, another

Unfortunately I don't have any tools in my folders and no printer. So I can't do any of those.

Snipping Tool is a program which comes preinstalled on Windows operating systems since vista. I doubt you don't have it.

[pal4]

Er, how go I upload a picture on these forums?

[Emral]

http://imgur.com/

[Ness-Wednesday]

What does it mean if I get an error saying that ( is expected near if?
This doesn't make sense to me.