lighting challenge on cgtalk

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lighting challenge on cgtalk

Post  mr-mégot on Mon Nov 24, 2008 4:15 pm

hi,

just for the fun, I have decided to partcipate at lighting challenge 17 on cgtalk, the scene is great (the hall of the natural history musuem of london Shocked )

http://forums.cgsociety.org/showthread.php?f=185&s=9aa129dcfd53b67071a5c9e96d5fa97e&t=691344

It's just for the fun, because I use the demo of fry, i have the watermark and the render is limited to 800**600 geek

maybe another fry user will be interested to participed Very Happy

my 2 first tests




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Re: lighting challenge on cgtalk

Post  pjetrus on Mon Nov 24, 2008 9:23 pm

Damn, that is cool scene Cool
but I'm to busy this month, so I think I would be unable to take part...

@mr-mégot
Cool renders. What about render times? Is the first one just enviroment?

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Re: lighting challenge on cgtalk

Post  jorari71 on Mon Nov 24, 2008 9:48 pm

I don't know who made the object (scene) but this should take a "few" hours... affraid

It sounds interesting.

Your results have been amazing. I like very much. You control very well the glare and bloom effects. Well done.

Thanks for posting!

Regards.
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Re: lighting challenge on cgtalk

Post  jorari71 on Mon Nov 24, 2008 9:53 pm

Something that I like very much is the degradation of the edge of the sadows in the second image over the stairs...This is an effect that I like very much.
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Re: lighting challenge on cgtalk

Post  mr-mégot on Mon Nov 24, 2008 10:33 pm

thanks Smile

so the render time are 3 hours for the first and 2 hours for the second (on a dual core 2.2 ghz)

it's lighting with just the physical sky.

but now I have a problem. I don't know how make the stained glasses Suspect

I have no idea to make how the texture in fry scratch if someone have a idea or a explain ??

thanks very munch

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Re: lighting challenge on cgtalk

Post  jorari71 on Mon Nov 24, 2008 10:49 pm

It's true that making randomly stained...A general pattern is at first time a bit..."Impossible" Crying or Very sad

Maybe you should made via textures combining with some transparency or manually via objects (triangles, etc)...These two ways are possible.

It's really interesting...If someone knows how to make it, please...I think this can be very useful (overall for me).

Thanks for your question.
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Re: lighting challenge on cgtalk

Post  pjetrus on Tue Nov 25, 2008 12:16 am

create a material with 2 layers. The first layer is weighted 90% and is ghost glass with [nd = 5] and 5% roughness. The 2nd layer is weighted 10% and is a plain surface with 100% roughness and a bitmap in the Ref 0 slot that is mostly white with grey streaks in it. Put the grey streaks where you want it stained

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Re: lighting challenge on cgtalk

Post  jorari71 on Tue Nov 25, 2008 4:50 pm

Hey! I'm trying to make the stained glass and...Oh Muy God...It's more difficult than I expected...

Meanwhile I'm listening...You know what? The last LP of the Wilson Philips!! I didn't know that they have made another one!!

Well, I'm watching at:
http://video.google.es/videosearch?q=wilson+phillips&hl=es&emb=0&aq=f&aq=1&oq=wilson+#q=wilson%20phillips&hl=es&emb=0&aq=f&oq=wilson%20&start=30
http://video.google.es/videosearch?q=wilson+phillips&hl=es&emb=0&aq=f&aq=1&oq=wilson+#q=wilson%20phillips&hl=es&emb=0&aq=f&oq=wilson%20&start=30

Excuse me for this links... Embarassed But I couldn't resist the temptation...

Thanks.
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Re: lighting challenge on cgtalk

Post  mr-mégot on Tue Nov 25, 2008 11:11 pm

well... for simplify this, I make use a picture of a stained glasses. But for give a glasse aspect, where put the picture of stained glasses?

in the bitmap of color section of glasses paramater or in the ref 0, or in the roughness ???

use 2 layer one for glasses and one for the picture (bitmap) ???

my first tests is not decisive, the picture of stained glasses is not visible scratch

so I hope that you understand me, then it's little bit complicated to explain and I dont' speak good english Neutral

thanks for the help

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Re: lighting challenge on cgtalk

Post  jorari71 on Wed Nov 26, 2008 1:21 am

I understand you very well because I've been making tests during a lot of time today...As I said: "it's important knowing this...The "How To" ".

Efectively the projected image doesn't appear ion the floor.

If you put the staind image in the SSS parameter you will achieve that the image can be seen in the window.

But for projecting the image on the floor when a light beam passes through the window...It's another history... No I don't know how can be made...

Here's a still of one of my "thousands" tests:

a).-The stained image (found on Google for example) to be applied on the glass of the window:



b).-The simple test:



I've made tests and tests during a lot of time in this mornig and afternoon and I haven't reach the projection on the floor.

Maybe in your scene the projection can be lost and the generation of indirect and general light inside the building will be the most important.

But I was interested in the consecution of the projection thanks to a beam light passing through the stained glass and this was why I located the floor of the little room really near of the staind glass, in order that the projection can be achieved.

I'm trying to upload my test scene... Surprised


Last edited by jorari71 on Wed Nov 26, 2008 1:34 am; edited 3 times in total
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Re: lighting challenge on cgtalk

Post  jorari71 on Wed Nov 26, 2008 1:32 am

The simple scene (.max): (I hope that this works):
http://www.box.net/shared/49t5n4cdgs

The material:
http://www.box.net/shared/okfqcpul1e

Does anybody know how achieve the projection of the stained image on the floor? Please, any suggestion or idea, will be very wellcome...

Regards... Very Happy
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Re: lighting challenge on cgtalk

Post  pjetrus on Wed Nov 26, 2008 12:13 pm

That is stained glass? I thought it was glass with dirt on it...
Anyway, I like your test.. Maybe try to put texture in transmittance also...

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Re: lighting challenge on cgtalk

Post  jorari71 on Wed Nov 26, 2008 12:45 pm

I've tried it too...But there's no results.

If someone has an idea of how to solve this... No
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Re: lighting challenge on cgtalk

Post  mr-mégot on Thu Nov 27, 2008 12:11 am

thanks for the help Wink

tomorow or this week end I post my test.

a question if I active the dispersion in tansmittance layer, its change something ??

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Re: lighting challenge on cgtalk

Post  pjetrus on Thu Nov 27, 2008 11:38 am

Yes, it will change a lot... Also it will change a render time..
As you can see from these renders, there is some color changing on the grount


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Re: lighting challenge on cgtalk

Post  jorari71 on Thu Nov 27, 2008 1:10 pm

I don't know what I'm doing wrong but in my scene I can't get the projection...

I'm in the same stage...Stuck! No

Can you make a render from my scene or upload a material or simply post the parameters exactly in the material in use?

Thank you very much...
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Re: lighting challenge on cgtalk

Post  pjetrus on Thu Nov 27, 2008 9:41 pm

First of all, are you sure you wanna use dispersion? It will take forever to render Rolling Eyes
Ok, I'll do a test and upload it..

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Re: lighting challenge on cgtalk

Post  mr-mégot on Thu Nov 27, 2008 11:41 pm

dispersion is like a caustic ??

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Re: lighting challenge on cgtalk

Post  jorari71 on Fri Nov 28, 2008 1:52 am

...Like caustics...This is what we would like it was.

It's strange but I think that this effect could be obtained easier with VRay...Don't you think the same?

Our objective is to reach the projection on the floor.

The fact is that if you use a normal red glass like Fryrender materials by default are...We can get a tinted red floor in the projection on the floor, but I've tested in my simple scene that when you use an image instead of a simple transparent glass we can't get the projection of this image. No

If someone else can help us...I've tried I would say ALL...I've no ideas to test...

Regards.
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Re: lighting challenge on cgtalk

Post  pjetrus on Fri Nov 28, 2008 1:01 pm

Ok, so this is what you need to do. First of all, make sure to have a direct light coming trough the glass. Then, you don't have to use dispersion, just absorption. Make sure to have the image texture on the transmitance slot. If your glass is 1cm thick, use 0.7 for the absorption distance... it should work. feel free to post your render Very Happy

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Re: lighting challenge on cgtalk

Post  jorari71 on Fri Nov 28, 2008 4:55 pm

I'm trying with the Sunlight/environment light system...I'm not testing it with a direct light...I understood that mr-mégot iluminated his scene with the environment/Sunlight system...

It's not a problem trying with an emitter but, I've to tell you that I've made tests with a normal (without any image on) glass tinted and the floor of course has been tinted wth the same color.

So, let's go..
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Re: lighting challenge on cgtalk

Post  mr-mégot on Sun Nov 30, 2008 6:17 pm

my test for stainned glasses



and the texture preview



well there are not a projection on the floor, so we make without Smile (for the moment Wink )

below the texture file if it interests somebody Smile
stained glasses file

now I work on the wall texture.

thanks

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Re: lighting challenge on cgtalk

Post  jorari71 on Sun Nov 30, 2008 7:22 pm

Well, its a good result. I can't wait to watch the final result! Smile

I've been making some tests and I think that in one of them I get a satisfactory result but my nephew who is 2 years old stroke a key of my keyboard and closed my session... affraid

The way is working starting from a base of a red glass basic material. I remember that I made it from here.

I will try again!!

Fantastic result mr-mégot. Thanks for posting! cheers
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Re: lighting challenge on cgtalk

Post  jorari71 on Mon Dec 01, 2008 10:38 pm

Mr-mégot...You can check my latest material...I think is what we were looking for!!

In the right section:

http://frydemo.forumotion.net/material-repository-f5/stained-glass-for-mr-megot-t55.htm#316

Regards!
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Re: lighting challenge on cgtalk

Post  mr-mégot on Tue Dec 02, 2008 11:30 pm

thanks Wink

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