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Subject: what the hell is TIR?

uryman opened this issue on Jul 30, 2002 · 13 posts
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uryman ( ) posted Tue, 30 July 2002 at 9:06 PM · edited Sun, 02 February 2025 at 10:07 PM

hello there, i have a big question about the TIR function within the render options in bryce 5.. i'd read that TIR does something related to the reflections of objects, well.. today i decided to do some experiments, and made a box of mirrors, put the camera inside, put a light and a metal sphere.. well.. i start moving the TIR and everytime i hit the button.. nothing happened.. first i deactivated it, then i put tir 5, then 10, then 25.. and the preview render was the same! no change was done.. so could someone tell me whats the deal with this function? thanks

clay ( ) posted Tue, 30 July 2002 at 9:36 PM

TIR ( Total Internal Reflections ) is good to use on such items as jewels etc. Things with faceted edges. After testing a setting of about 25 is what I use.

Do atleast one thing a day that scares the hell outta ya!!

Rayraz ( ) posted Wed, 31 July 2002 at 3:29 AM

I've seen something about this a while ago. I think it worked like this: there was a simple underwater scene with a fish just under the water surface. when TIR was off the fish had no reflection in the watersurface because it was inside the water object. With TIR on the fish did have a a reflection even though it was inside the waterobject. A setting of 1 makes the renderer render just one reflection inside the object, with a setting of 2 you can render a reflection of a reflection and with a setting of 3 you can render a reflection of a reflection of a reflection and so on. I'm not completely sure but I think this is what TIR is.

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Renderbrant ( ) posted Wed, 31 July 2002 at 9:03 AM

Hi uryman, This link will help explain things about TIR: http://www.bsmooth.de/BSolutions/#TIR :)

bromyaur ( ) posted Wed, 31 July 2002 at 9:22 AM

Attached Link: http://www.graphicsteck.com/forums/index.php

file_18278.jpg

this image was rendered with tir and set about 10 I think

johnpenn ( ) posted Wed, 31 July 2002 at 10:44 AM

Holy smokes! That setting is great! I can't believe I had never noticed it before!

johnpenn ( ) posted Wed, 31 July 2002 at 10:53 AM

file_18279.jpg

And what a difference this makes! I'm going to have fun with this one, I had all but given up on fancy light effects, but now... oooh goodie goodie goodie. I sitll can't believe I hadn't heard about this (or rather not consciously paid attention to it.)

cshaftoe ( ) posted Wed, 31 July 2002 at 6:43 PM

I gotta start using this.......!!!!

Spit ( ) posted Wed, 31 July 2002 at 6:50 PM

You don't see the results of TIR in the preview. It's one of those things that only show up in the render.

Aldaron ( ) posted Wed, 31 July 2002 at 7:27 PM

I suggest you don't go above 6 as Bryce will only allow 6 reflections anyway. If you use more you get those blank black facets.

bromyaur ( ) posted Thu, 01 August 2002 at 9:46 AM

Attached Link: http://www.graphicsteck.com/forums/index.php

Thanks for pointing that out Aldaron, I was wondering why I got them black blotches that kind of ruined the image.That was my first attempt at TIR.

TrAnd ( ) posted Thu, 01 August 2002 at 4:58 PM

We spoke already of this point few days ago on this forum with cobalt. The best value seems to be around 3 to 5.

Patricia ( ) posted Sat, 03 August 2002 at 1:09 AM

Only in B5, huh? Rats!

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