Topic awaiting preservation: Refraction (Page 1 of 1)

Go ahead and boot up the ol' PS2. Yep thats what I'm lookin for.

Just render a cube, take random rectangle selections and translate?

(For those who don't know what on earth I'm talking about I'm wanting to have a cube on a background, with the background refracting into the cube as if it was glass. Trendy? Dunno.)

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"The Mystery of Life"
Vol. 841, Ch. 26
"All life begins with Nu and ends with Nu. This is the truth! This is my beleif! ...at least for now." - Chrono Trigger
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So.......

Are you asking for sugestions?

Is that.....your suggestion?

help us out here.....

Realistic refractions from cubes are notoriusly hard ot reproduce. I think you'd be best served by trying to get your hands on something similar and observing the way the light plays through it...or you could just get a degree in physics and calculate it manually...if it comes to that always remember that the index of refraction for glass is 1.75

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Yep thats what I'm lookin for.

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Bingo. Yeah I heard this is a hard thingy to do, and thats why I wanna do it


---
"The Mystery of Life"
Vol. 841, Ch. 26
"All life begins with Nu and ends with Nu. This is the truth! This is my beleif! ...at least for now." - Chrono Trigger
><>

or better yet, get 3D Studio Max or something similar and do ur cube thing ina matter of minutes (if u know what ure doing) or hours (if u dont know what youre doing)

heres some funky refraction from my stuff:



P.S. Oops. Didnt notice this was a photoshop forum o well. still.



[This message has been edited by asptamer (edited 10-10-2003).]

If you want to learn about the actual math behind refraction, head to your local Physics class. It's pretty low level stuff. The angle of refraction depends on the substance you've got it going through though. (You need to know it's index of refraction.)

For all purposes though, I'm sure you could eyeball it.

trueSpace 3.2 can do it - and it's free
http://forms.caligari.com/forms/ts3all_free.html

Give it a whirl.

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trueSpace 3.2 can do it - and it's free

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Damn, warjounal.

I would have bet money that you would have responded with a five page ramble about using the displace and glass filter for just such an occasion.



[This message has been edited by Moth (edited 10-10-2003).]

This is *exactly* what raytracers are for =)

But if you just want a quick version, you can probably eyeball it, possibly with a glass object for reference.

Ok... HERE'S a thought!...

What kind of background are we talking about here?
AND... what angle will the cube be viewed at?

Unless it's from a straight-on or only very slightly tilted angle... the reflections and refractions are going to just look like a jumbled mess, like a broken puzzle.

And since most people have never seen a cube sitting tiled on any surface, they'll have no idea what the refractions are REALLY supposed to look like. So in this case, artistic license is wide open.

One thing to take note of though... in reality, the cube would also be reflecting/refracting the open area around itself, and anything residing in that area... like furniture ... not just the background it sits upon.

Bah! Guest is ruining some of my fun. Doing such a thing with a 3d prog can be tricky. You won't see just an image on a plane behind the object, but stuff "outside" of the plane. Takes more thought than an object and a plane with an image.

And I certainly agree with faking it.

Yes, Moth, I do have a tutorial in the works for such a thing. Remember Broken China? That was my first or second tutorial. Shortly after that, I developed a technique that fits the bill for this. However, I've been holding on to it since Tech-Slop got started (2 years?). Once I get done with the one that I'm currently working on, I'll tackle this old monster technique. And it will be a good 5-7 pages.

Here is a quick-n-sleazy example of such a D-Map that I will be writing about:



I'm getting all tingly!

Warjournal! Get your fingers typing! Thats exactly what I'm lookin for!

And if I had the money for a spazzy 3d modeling program... I would use it... >< Anywho I tried some stuff of my own and that looked really crappy. War journal's got more what I'm looking for.

---
"The Mystery of Life"
Vol. 841, Ch. 26
"All life begins with Nu and ends with Nu. This is the truth! This is my beleif! ...at least for now." - Chrono Trigger
><>

I knew it! I knew it!

The man's a machine.

^ That would be MR. MACHINE to you and the rest of us. =)

Hey Wj... Don't forget to address the issue of how changing the perspective on the cube changes how the D-map should be made. The sample image you've posted shows only one possible angle; which dictates how the refracted lines of the cube are broken up. With each perspective this will change, so a "formula" may need to be developed/explained to compenstae for the perspective variations.

Let me know if i'm still ruining your fun. hahaha



[This message has been edited by theGuest (edited 10-11-2003).]

Actually, Guest, you've hit one of the major downfalls of what I have in mind. It's set in stone, as it where. But you knew that, didn't you? You can't fool me, you old goat. Heh.

Also, it doesn't exactly follow the math for real refractions. It's for other things; so, if using it for refraction, it does fall under fakery. However, it's rather good fakery. It's the same technique that I used to give the front end of a truck a custom paint job over at your forums (if you remember that thread).

Well, I suppose you could use it to come very close to real refractions, but it would be a real brain smasher. Even I don't want to think about it.

Ruku, don't hold your breath waiting for me. Even a rough draft will take me at least two weeks. I think your first instinct to chop and transpose is a good one. However, I would chop in Alphas and use Distort sprinkled liberally with Layer Masks from the chops.

Oh you know me SO well. hehe
And yes, i DO remember that thread.

[This message has been edited by theGuest (edited 10-11-2003).]

Ok yeah, but most of the people who look at it aren't gonna be stoping, doing advanced physics and then e-mail me and say, "HA HA! Your image is off by -0.05648892E2!"

How's the tutorial commin?

---
"The Mystery of Life"
Vol. 841, Ch. 26
"All life begins with Nu and ends with Nu. This is the truth! This is my beleif! ...at least for now." - Chrono Trigger
><>

Right now, it's not going at all. Dealing with family business, and it's very not pretty.

When my head gets a little bit more normal-like, I'll be back with some exercises to get you started. You know, foundation stuff so the technique as a whole doesn't set your hair on fire.

as far as i know actual cube refraction isn't as pretty
as on pictures becouse the picture or anything behind
it can only be seen from the opposite side of the cube

eye cube picture
__
->

Aha but I'm not going to be putting Biker Chick behind this, I'm just gonna be doing some uber-trendy junk. Go see the topic. You'll see how much you won't want to d/l this thing when I'm finished ><

---
"The Mystery of Life"
Vol. 841, Ch. 26
"All life begins with Nu and ends with Nu. This is the truth! This is my beleif! ...at least for now." - Chrono Trigger
><>