Photorealism

[FatAssasin]

Looks very real. I like the little nicks and bumps on the wheels, nice touch. What did you use for the wood texture?

[Lewis3D]

Looks GREAT and very realistic but something isn't clear to me :). Why do you have RED and Green shadow on floor :). It looks like you have shiny materials used like light sources trough GI. I think that shadow need to be pure black since floor isn't reflective. Chrome is great :).

[alphatron]

Very nice indeed. Can you please detail your GI technique adapted in Maya?

[Mr.White]

I agree... shadowns are usualy always black

[dur23]

the red green and shadows are is Global Illumination in effect...
but not so much a shadow than it is light bouncing the colors of the train onto the ground...

Very nice and clean...one thing i'd like to see tho is some caustics maybe from the metal bouncing onto the floor or whever they might end up going...:)

[WAVK]

Whoa! That's one real train. Brings up memories, I had a set of these type of trains:) Great weathering, well the pic is beatiful! As real as it gets;)

Have fun,

Wybren van Keulen
Funny Farm

[beej]

if you have a glossy & light coloured surface it will reflect colour. looks good..you should have modeled the track too!

[3dr]

Thanx for the positive feedback folks:)

FatAssasin: For the wood texture, i first created a detailed bump map, since this would define how both the color and specular map would look. It was created by basically blending a lot of diffrent wood textures i had laying on my hb, using a lot of curves and levels modifying, then painting in some specific features like the skratch on the roof etc.

Lewis: The red and green coloring of the floor is my attempt to fake color bleeding, as dur23/beej explained:thumbsup:

alphatron: The light setup is fairly simple, I used a spherelight rig gererated by the great script GI_Joe, and a Area light for key light.
check out more info about GI_Joe at http://www.3dluvr.com/pixho
The color bleeding effect was acompished in two passes. First i rendered out a reflection pass with only the train being reflected in the floor. This was heavily blurred and masked in photoshop. I then rendered a pass of 4 red planes places under the weels, for additional color bleeding. This pass was also heavily blurred and layered over the first color bleeding pass. This is not limited to stills only, and can be applied to an animation.

[j3ro3n]

It looks really slick! The texturing is amazing...maybe you can apply a environmental-map for the reflection in the metal wheel-parts.... :D Great j0b, brings me back too!

[3dr]

An environmental reflection map on the weel metal is a good idea, i was thinking about breaking up the black areas a bit, but didn't get around to actually doing it before the image was submitted to the contest.

[GHAS]

How did you do the green wood texture.... is it just a bump mapÉ:airguitar :airguitar :airguitar

[Mr.White]

How did you do the green wood texture.... is it just a bump map?

[JFrench]

Mr. White, contrary to what you posted, shadows are almost never black. Shadows are usually a complimentary color of the light source itself.
The colors left on the ground plane in this particular render aren't even shadows really, but the light that is reflected off of the surface above it. I do think it could be toned down just a little, 3dr.

[Mr.White]

dear mr. JFrench,

really.... show me a really picture with A RED OR BLUE SHADOWS AND I WILL CLOSE MY MOUNTH

:beer: :beer:

[ToddD]

Mr white, Jfrench is technically right. The shouting is kind of harsh, but no need for Jfrench to show you a pic, if you really look at things sitting around the room you are in, you will not see pure black shadows. Want to see red or blue shadows, get a sheet of white paper, get a red or blue object, position and light it in a similar fashion. Light will bounce off the object and influence the shadows. 3dr's shadows might be a touch too pronounced, but he is correct.:wavey:

[NanoGator]

Yep. It's called 'radiosity'. You're not seeing a shadow of a diffferent color, you're seeing reflected light off the object.

[j3ro3n]

I think we are missing the difference between two things here. Shadows are technically places where there is no light, therefor nothing to see. That means that a shadow is allways black. Because of the fact that in real life you allways have some kind of global illumination, you will rarely see some perfect black shadows. I think the 'colored'-shadows we are talking about are a blend of radiosity and shadows, and not just colored ones. The reflection of the light in a colored object blends with the 'gray' shadow, and it looks colored. Two things that are mixed together.

But shadows are allways black/grey!! They are black in an ideal situation or they are grey when there are more than 1 light emitting sources around the object we are talking about. The colour you see is the radiosity shining through...

[sherban]

I think that shadow need to be pure black since floor isn't reflective.
I agree... shadowns are usualy always black
Shadows are technically places where there is no light, therefor nothing to see.

Some cold facts about light:
1. reflection. all surfaces we see with our eyes are reflective to some extent. In fact we don't see the objects themselves - we see the light reflected from them. This may not be the clear reflection of a mirror but it is reflection nontheless.

2. shadows. shadows are areas where light does not reach directly. They are only lit by the light reflected from the objects around them. Had they been places where there is no light they'd be pitch black we would not be able to see anything in them.
The only place where you'd get 'pure' black shadows would be out of the atmosphere - like on the dark side of moon. (although near the end of the lunar cycle it too is lit by reflected light from the earth and can be seen).

really.... show me a really picture with A RED OR BLUE SHADOWS AND I WILL CLOSE MY MOUNTH

Some fun facts about light:
here's a little test for you. Take a red piece of cardboard or a red shirt and hold it close to a white wall. Look at the shadow. You will see that the cardboard reflects light unto the wall too. except it filters out all colors but red. In effect turning the shadow red - much like in Jan's beautiful image.

[psil]

Hey 3dr - to me, that's photorealistic:thumbsup:

[Mr.White]

http://www.cgtalk.com/showthread.php?threadid=15405&goto=newpost

[Mr.White]

I BELIEVE THAT TODAY WE ALL LERNED SOMETHING !!!

THANKS Mr. Sherban

Mr. White

[3dr]

Ghas/Mr.White: The wood texture has a bump map, a color map and a specular map. I also rendered out a couple of reflection passes, one of the train reflecting the environment, and one of the wood reflecting the weels and the magnet in front. These passes were blended over in photoshop. I could have shown the different maps i created, but i'm on vacation now and don't have access to the files.

JFrench/Tbonz816: I might have gone a bit crazy with the color bleeding, i'll see what i can do about it.

sherban: :beer:

[ToddD]

3DR, I thought your piece was excellent BTW, the color was just a touch too strong in the shadows, wasn't really criting your piece:beer:
And I think we all pretty much stated the same thing in response to Mr. Whites request, just with different words.:)

[Benken]

Well I find that the wheels appers used if you look at the edges but they shine very nice. Shouldn't they be (I dont know the name but) not so shiny??
I realy like it, great work!:thumbsup:

[3dr]

Nice observation on the weels benken. I have a map that breaks up the surface a bit, but i guess it should have been more pronounced. Perhaps a fingerprint would have been nice also..

[Mr.White]

Mr. 3dr

do not change anything in your render... it's perfect... please, keep showing this kind of professional work.

Mr. White

[sumatra]

A nice image indeed.,

only thing i can comment is the absence of bump in the forehead., usually a cut vertical to wood lines produces some imperfections etc., it could have been stucced out but stucco itself would have leave some imperfections behind him and especially around the edges.,

[3dr]

sumatra: On my reference image of this train, the bump in front was very small and not very pronounced. I guess this vary from train to train, but in general the texture is quite smooth in the front.

[mandaricmarko]

the shadows are a dead give away... don't get me wrong it's a good image; but one look at those shadows trying to fake radiosity....

-Marko

[MasterZap]

On colored shadows....

Take one red lightbulb and one green lightbulb

Place them side by side

Hold out your hand.

Watch your red and green shadows! (coz where the red light is shadowed the green can light making a "green shadow" and where the green is shadowed the red can light making a "red shadow"). Perdy. ;)

/Z

[mandaricmarko]

well technically that's still radiosity since the only thing there that's green/red is the lightbulbs outer glass shell.... not the light it's self (the filiment inside the bulb will always emit white-light). so in actuallity your still talking about lighting bouncing off and through colored objects and giving/"bleeding" their colors....

ie radiosity (all this still doesn't change the fact that the image's radiosity/lighting gives it away as a fake)

[3dr]

mandaricmarko: If you got some suggestion on how to improve the radiosity/lighting of my image, that would be very much appreciated.

[mandaricmarko]

well, i'd start by finding a GI faker script...

i'm personally in max, so i know they exist here and i would assume that they do in maya aswell...

basically all it will do is creat many more lights than you have there, and thus difuse the radiosity a bit more realistically for as of now it looks like your radiosity is just really colored shadows...

yes, i think a few more lights would help a bit.

[chemicalpixels]

HELL YEAH!!! :airguitar :buttrock: BRIO'S ROCK!!!!! :D

[RobinOberg]

love that render, all thats missing is an environment so that the wheels can reflect something.

and it would seem that there are a number of people that post here that doesnt know what radiosity is :)

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.