Lighting Dynamics Demo

[spynaz]

Here, I made a pixel effect version completely from scratch:

spynazPE.love

I couldn't bear your insisting to index tables with strings, why not just use Lua? Instead of

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table["index"]

simply do

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table.index

Thanks bro!

[T-Bone]

Just wanted to point out that you can absolutely use shaders to get a pixely lighting. Just write your shader so that all pixels within a certain square size always get lit by the same amount. Or, perhaps even better, render everything in low-res with the shader (where every square is simply a pixel) and then scale it up.

[timmeh42]

row-les

I don't even what is that.

Ontopic, this would also increase the speed dramatically - depending on the size of your squares, 2x2 squares would be a 4 times increase - compared to per-pixel.

[spynaz]

How would I change the color of the light?

[T-Bone]

row-les

I don't even what is that.

Ontopic, this would also increase the speed dramatically - depending on the size of your squares, 2x2 squares would be a 4 times increase - compared to per-pixel.

Strange typo. Maybe I'm turning japanese?

[spynaz]

How would I change the color of the light in the pixel effect one?

[bramblez]

How would I change the color of the light in the pixel effect one?

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canvas:renderTo(function()

	love.graphics.setColor(125, 125, 125, 125) -- color of light
...
end)

----

Thanks!
Didn't appreciate the difference!
Docs say:
"os.clock() Return CPU time since Lua started in seconds."
Thought seconds were seconds - that CPU seconds were then same as Universal seconds.
Good catch!
Really appreciate input.
Edit:
Turns out on my computer that the os.clock() and os.time() happen to give the same elapsed time for this demo.
Demo actually is terminated by bee.buzz:isStopped( ) - when music is over.

hey, Ref. Can you explain me how to use dynamic lights from this .love to make it work for each bullet in this bullet lib?

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function bullets_load()

   bulletspeed = 100
   bullets = {
   x = 0,
   y = 0,
   dx = 0,
   dy = 0,
   bullr = 2
   }

end
function bullets_update(dt)

   for i,v in ipairs(bullets) do
      v.x = v.x + (v.dx * dt)
      v.y = v.y + (v.dy * dt)
      if checkCircularCollision(v.x,v.y,cx1,cy1,2,cr1) then
         print("HIT!")
      end
   end
   
end
function bullets_draw()

   love.graphics.setColor(0,0,0)
   
   if shooting == 1 then
      for i,v in ipairs(bullets) do
         love.graphics.circle("fill",v.x,v.y,2)
      end
   end
   
end
function checkCircularCollision(ax, ay, bx, by, ar, br)

    local dx = bx - ax
    local dy = by - ay
    local dist = math.sqrt(dx * dx + dy * dy)
    return dist < ar + br
   
end

[bohdan77]

Someone made this video.
http://youtu.be/Gy9tvA9AlSg

[raidho36]

Yeah, it's pretty good. Once I did almost exactly the same thing with GameMaker, but due to it's exceptional performance my demo was nowhere close to what's seen on that video regardless vast efforts to keep it fastest possible. Oh well. I think I'd rewrote it for löve once I get used to it. Was considering switching long ago, but baby duckling syndrome is a powerful thing.

I assume it can be done easily with löve, since it only requires offscreen buffers and blending modes (and maybe graphical primitives):

0) render your scene lit white
1) for each light source perform the following
2) set target shadow render buffer, clear to black
3) render light source texture onto it
4) then for each shadow casting object
5) render shadow, particular algorighm depends on particular object type, obviously
6) after that, merge (with addition blend mode) shadow render buffer to shadow accumulator buffer
7) after all light sources done, place composed shadow buffer onto scene with multiply blend mode.

And make sure you cull what's not visible, this is kinda tricky task. I'm not entirely sure how do I acheive this effect only using stencil buffers (probably just render-your-shadows-to-stencil -> render your light -> repeat over), so I just post how I did it.

[jjmafiae]

2 words:

FUCKING COOL!