Lighting and Shadow System

[Jasoco]

Actually the way Teleglitch does "lighting" is not actual lighting. The camera is fixed always facing down and each wall has a black wall above it that reaches all the way up to the camera. It gives the illusion of being lighting.

It's just a fancy 3D trick. And a pretty unique one at that.

[slime]

http://simonschreibt.de/gat/teleglitch-viewcones/

[argh]

Yes I believe a Teleglitch-like viewcone can be achieved with a subtractive shadow casting algorithm as the starting point.

[Ranguna259]

Has this been discontinued ?

[PriorBlue]

Hi,

i don't know, if this project is canceled (because the screenshots and links are empty). So i post here my "own" light shadow engine. The code for the poly2shadow calculation is not from me, but i have added a circle shadow calculation, a functionality to blur the shadows, light interaction with the object surface (no self shadowing at the moment), better performance when only lights are moving and i packed all the code in an easy "love-like" module.

Here a colorful screenshot:


To use the engine, just implement these:

Code: Select all

require "light"

function love.load()
	-- light world
	lightWorld = love.light.newWorld()
	lightWorld.setAmbientColor(15, 15, 15)

	-- add light example (x, y, red, gree, blue, range)
	mouseLight = lightWorld.newLight(x, y, 127, 63, 0, 400)

	-- add a few shadowbody examples
	shadowRect = lightWorld.newRectangle(0, 0, 32, 32) -- (x, y, width, height)
	shadowCircle = lightWorld.newCircle(0, 0, 16) -- (x, y, radius)
	shadowPoly = lightWorld.newPolygon(0, 0, 1, 0, 0, 1) -- (polygon data)
end

function love.update(dt)
	-- example for change your light position
	mouseLight.setPosition(love.mouse.getX(), love.mouse.getY())

	-- a few examples for change the shadow bodys
	shadowRect.setPosition(x, y)
	shadowCircle.setRadius(64)
	shadowPoly .setPoints(0, 0, 1, 0, 0, 1)
	-- or get the poly direct from a physic object
	shadowPoly .setPoints(phyExample.body:getWorldPoints(phyExample.shape:getPoints()))

	-- update lightmap
	lightWorld.update()
end

function love.draw()
	-- draw lightmap shadows
	lightWorld.drawShadow()

	-- Draw your stuff here

	-- draw lightmap shine (optional)
	lightWorld.drawShine()
end

Have fun!

PS: just for your interest, i made a experimental pixel based shadow shader, check it out -> http://love2d.org/forums/viewtopic.php? ... 20#p163757

[Ranguna259]

You know what, I'm gonna drop my shadow and lightning project and I'm just going to use yours, would it be ok if I sent you the bugs (if I find any) of your code or some suggestions ?

[PriorBlue]

You know what, I'm gonna drop my shadow and lightning project and I'm just going to use yours, would it be ok if I sent you the bugs (if I find any) of your code or some suggestions ?

Yes, of course and it would be nice if you post your improvements too.

I love the idea of an easy to use standard light library like the physics module and the more people are working on it, the better the result.

[PriorBlue]

So i have added a few new features:

• added optional glow
• glow size and strength can be changed
• added light smoothing (for discreet lighting or spot lights)

Preview:


How to use:

Code: Select all

light.setSmooth(0.5)
light.setGlowSize(0.1) -- 0.1 = 10%
light.setGlowStrength(0.5) -- 0.5 = 50%

[ArchAngel075]

Regarding the latest polyshadow :

I seemed to be unable to change the strength of the light (mouse wheel) after fiddling around, All i could achieve was scrolling alot to make it suddenly jump from no light intensity to maximum and then scrolling in the opposite direction just made it jump to 0 light intensity again instead of the smooth/gradual declining intensity.

Not sure how to replicate the issue though.

[Ranguna259]

PriorBlue, do you have a git for this ?