LIGHT TRACER &s RADIOSITY

[Cesar R]

In viz as in max 5 there is this option in rendering, what is the difference and its application?

[kid]

Light Tracer is your average monte-carlo global illumination engine (Brazil, VRay, VirtuaLight, etc), good for exterior scenes where skylighting is a large amount of the overall lighting, also for animations where meshes deform during the animation, like characters and stuff.

 

Radiosity is just like (principle, not engine) Lightscape. You know what that is good for I'm sure.

[Cesar R]

lol, yes I do, thank you Kid

[Wojciech Klepacki]

O.K. no problem. I pack it with WinZip and post on Your priv email. Let me some time to complete it. About 6pm (Your time zone).

[Wojciech Klepacki]

Sorry Cesar, wrong place for my previous post. It concerns AutoCAD tab... sorry once again. BTW I do it as I promise.

[Cesar R]

what does regathering exaclty do? why would I want to used it?

[Wojciech Klepacki]

Hi Cesar,

Here is quotation from Viz reference manual:

"By default when you render, VIZ first recalculates the shadows from light objects, then it adds the result of the radiosity mesh as ambient light.

 

VIZ offers three possible rendering options in this rollout:

 

Re-use Direct Illumination from Radiosity Solution: A quick render that calculates shadows from the radiosity mesh, so they tend to be a bit coarse.

 

Render Direct Illumination: A longer render that calculates shadows by the standard renderer, so they are a better quality.

 

Regather Indirect Illumination: The longest and best render that calculates shadows from all the light sources and corrects artifacts and shadow leaks.

 

Note: This is extremely intensive for your CPU and uses a lot of RAM, so it might not be practical for print-resolution images (for example, 4000 x 4000 pixels)."

 

And...:

"Refine Iterations (All Objects): Sets the number of Refine iterations to perform for the scene as a whole. The Refine Iterations stage increases the quality of the radiosity processing on all objects in the scene. Gathers energy from each face in order to reduce the variance between faces using a different process from the Initial Quality stage. This stage does not increase the brightness of the scene, but it improves the visual quality of the solution and significantly reduces variance between surfaces. If you don't reach an acceptable result after processing a certain number of Refine iterations, you can increase the number and continue processing.

 

Tip: If you plan to use Regathering at render time, you generally don't need to perform the Refine stage to get good-quality final renderings"

 

It's well described above, so I don't think it requiers an extra explanation. Best regards.

[Cesar R]

hey thank you,

yes its very useful..

 

U know, I am upset that copy of Viz since its an educational ver. is missing everyting. I just got a CD

 

btw I did get ur e-mail thanks.

[Wojciech Klepacki]

Hi Cesar,

U can order a copy a demo of viz at your local dealer. It contains online manual and reference guide. Commercial version has very poor printed manual, most chapters end: "look your online reference"... It costs me obout 1000 EURO :-((( and they didn't enclose worth mentioning manual. BTW chapters treat about GI, lights, materials are absolutely insufficient. I'm not a perfect viz user, but if u have a question I can find an answer, please let me know. Best regards.