Orbit Trap in GI frag

[eiffie]

1. Since lightColor is a uniform it can't be changed so add a variable called emColor and change it in your mapL function depending on which light is closer. Then near the end of the scene() routine there is a line like:
else tcol=lightColor/...
change it to
else tcol=emColor/...
but be warned adding lights like this will have some new strange effects (maybe some good ones).

2. Yes those are some of the issues I would like to fix and to add the correct selection of diffuse or spec lighting.

[vinz]

Thanks For your Help Eiffie

i'm not sure how to do this:"change it in your mapL function depending on which light is closer"
as you can imagine there is 90% of the script that i don't understand this is the first time that i code something hahaha  ...

EDIT: HAHAHAHAH,i've found something , not shure if it's correct but it works

Code:

	float p;
	p= dot(lightPosition,z);
	if (p>0) emColor= lightColor2;
	else emColor=lightColor;

[eiffie]

Well whatever works! I meant like this:

float d=length(z-lightPosition)-lightSize;
float d2=min(d,length(z-lightPosition2)-lightSize2);
if(d2==d)emColor=lightColor else emColor=lightColor2;

Now that I look at it I guess it would make more sense to only do this once in getEmissiveDir not in mapL.

And I'm glad your learning some coding - I knew there was a reason for my sketchy coding

[vinz]

HA! Great Thanks Eiffie ... i'm going to do That !

I knew there was a reason for my sketchy coding

Hahah, i always dream to understand how render engine works, but i've no mathematical neither programming background,
with fragmentarium i found a door, to learn both ( also trying to learn ) with the speed of the gpu hahahaha ! ... the idea to render my own fractal on a  render engine that i can
custom is simply enormous!!!!! ... and as i love Pathtracing  and Gi your "sketchy" code is a gold mine

Edit : it works perfectlyThanks Eiffie

Code:

vec4 getEmissiveDir( in vec3 pos)
{//get the direction to a DE based light
	vec2 vt=vec2(mapL(pos),0.0);//find emissive light dir by triangulating its nearest point

	float d=length(pos-lightPosition)-lightSize;
	float d2=min(d,length(pos-lightPosition2)-lightSize2);
	if(d2==d) emColor=lightColor; else emColor=lightColor2;

	return vec4(-normalize(vec3(-mapL(pos-vt.xyy)+mapL(pos+vt.xyy),
			-mapL(pos-vt.yxy)+mapL(pos+vt.yxy),-mapL(pos-vt.yyx)+mapL(pos+vt.yyx))),vt.x);
}

[vinz]

Hi

i'm trying to add a spherical map as sky texture, i've tried for few hours , now i've lost hope.
here some code i've tryed:

1. this code seems working well in all others frags that use spherical image, as the dir variable is defined in the 3d.frag it seems i can use it.
but the result a brown sky.

Code:

vec2 spherical(vec3 n) {
	return vec2 (acos(n.z)/PI, atan(n.y,n.x)/(2.0*PI) );
}

and

Code:

	if(UseBackgroundPicture){
		backColor = texture2D(texture,spherical(normalize(dir)).yx).xyz;
	}

i've also used

Code:

	if(UseBackgroundPicture){
		backColor = texture2D(texture,spherical(normalize(rd)).yx).xyz;
	}

 it give a better result but the background is not aligned properly.

i also tryed a lot of other things and conversions functions cartesian to spherical to cartesian etc... nothing to do !
do you have any clue ?

Many Thanks !!!!!!!!!!!!!!!

Edit: i used the equirectangular camera in this screenshot, so i think i should have the equirectangular background if everything is fine.


i should have something like that :

Code:

	if(UseBackgroundPicture){
		vec2 position =  (viewCoord+vec2(1.0))/2.0;
		position.y = 1.0-position.y;
		backColor = texture2D( texture, position).xyz;
	}

but this code is independent/not locked to the camera view

[vinz]

HAHAHAHAHA! i've just found empiricaly that with using the rd variable the background needed a rotation of 90° around x axis,
After a lot of search i've for the first time understood how the rotating matrix work ! Excellent

so the code is now

Code:

	if(UseBackgroundPicture){
		float theta = 1.57079633;
		backColor = texture2D( texture, spherical(normalize(vec3(rd.x,rd.y*cos(theta)-rd.z*sin(theta), rd.y*sin(theta)+  rd.z*cos(theta) ))).yx).xyz;
	}

here the result hehehe !



Pfiou that was not easy !! to me and myself  

[cKleinhuis]

  have fun dude congrats!

[vinz]

Hahahaha ! cKleinhuis   .... don't laugh at me i never imagine that i was able to do that
Thanks for supporting me in this road plenty of fractal traps  

[cKleinhuis]

i do not laugh at you, i am enjoying that you are having fun!!!
actually this is exactly the feeling when i see that someone has learned something and is having fun with it!

[vinz]

Hehe ! you're are seeing the little padawan with the eyes of the master Yoda
i am aware of your wisdom ....  

edit: hahaha i'm a navigator now

[hgjf2]

Nice image effect like in site WWW.PAULBOURKE.NET at chapter "images" and chapter "domes" where is many stereos images and effects.
 

[eiffie]

OK vinz I updated the eiffieGI2.zip script in the other thread and now a black object will still have specular reflections.
The only change is in the scene function so you should be able to plop that in your script.

[vinz]

YeaHHHHHHHH !!! Thanks you very much Eiffie for taking the time to improve your Script and sharing it ... Excellent , you made my Day 
and i will have some new clues to understand how the script work...

[vinz]

Nice image effect like in site WWW.PAULBOURKE.NET at chapter "images" and chapter "domes" where is many stereos images and effects.

Hey Hgjf2 , i dind't found what you spoke about

[vinz]

Eiffie,

i've just finished adding your new code , and it works very well.
it was not easy as i thought, because you have modified a lot of function outside the scene one .

i've found a new strange behaviour, at first i though it was my bad code.
but i obtain the same result on the lastest version of the script.
in fact when i switch off all the light in the scene (emissive,sky,sun etc...) and then i increase the gamma and brigthness
the scene appear to be lighten! .. i'm asking to myself where does this light come from.