PDA

View Full Version : mental ray too bright

johnnynightlife
10-24-2003, 09:30 PM
i just finished the very helpful tutorials dealing with mental ray that are on the maya tutorials database, and i had no problems with the results. the problem is, nopw i am trying to render a scene of an internal room that i designed 4 a client, and the rendering is completely whitewashed with light, just a hint of geometry is noticeable. I have tried this with several of my own scenes, and get the same result.
within my scenes i follow the steps given in the tutorials, i have tried adgusting every parameter within mental ray globals, and within the two spotlights dialog boxs'.
after light linking lights to geometry, i set the two spotlights to the colors i want, set intensity of both lights to 500, quadratic decay, raytrace shadows, energy to around 8000, exponent to somewhere around 1.5, 1.3.
then within mental ray globals, turn on GI, accuracy i i have set at 100, radius is 5, final gather i set any where from 200 to 1000, and set the min, max according to the scene size, turn in jitter, Gauss filter, and render.
whiteout.

ahave tried many different settings and combinations, but basically i have the same parameters as within the tutorials i have worked through, and i have had no success.

anyone? anyone?
Ozren
10-24-2003, 10:39 PM
Well it realy could be anything, from shaders to lights.

Anyway, set your exponent to 2, then if its still to bright, lower your lights intensity.

If its realy important, just attach the scene file here so someone can look at it.
johto
10-26-2003, 04:19 PM
Two good ways to adjust the brightnes: Adjust he energy values in lights and adjust your materials "irradiance color" value which is under "mental ray" on every material.
galactor
10-26-2003, 10:09 PM
Maybe Mental Ray doesn't use Maya decay attribute, so the intensity is indeed to much. It could also be that it calcultes the decay different. Do you realy need lights witn an decay?

:: Galactor ::
Ozren
10-26-2003, 11:35 PM
When you are setting up HDRI shader, dont connect HDRI to ambient colour and colour, just connect it to ambient. In 5.0 you could connect to both, but in 5.1 you cant, i meen you can but you get overburned scene.

Anyway, i bought AW rendering with MR DVD, and the guy there also connects HDRI only to ambient colour, so i guess thats the correct way.
johnnynightlife
10-27-2003, 01:24 AM
actually, this isn't HDRI, but i did figure out what most of the problem is........ I think, obviously i turned off the default light, that was the first thing i did, but i figured out that the spotlight was too close to the scene i was rendering......???? does that make sense to anybody? after rendering a complete whiteout scene, i moved the spotlight waaaaay back, rerendered, and i had a scene i could at least begin to work with.

Ozren, what do you think about that DVD you bought? Do you recommend it? I have very limited knowledge about MR, and i was looking around 4 something like what you mentioned.
Ozren
10-27-2003, 08:20 AM
DVD is great, it explains some basic MR stuff like GI, FG, HDRI, Shadows, Light Baking, DGS...

Tho i would recommend you to wait for http://www.motiondesign.biz DVD. I will defenetly save some $$ and buy that one also.
dirkusrhombas
11-04-2003, 05:38 AM
Heres a few of the most important things to consider when using fg with mental ray .... Its a very basic vid tutorial lightly touching some of the basics with fg .... im also a noob why not do a vid of another rendering techinique, or the same technique with other features that I havent looked into and post it for me

http://www.dirkusrhombas.pwp.blueyonder.co.uk/rendertest.avi

Ok things to consider

1) vid is encoded in xvid, download it its free

2) I made the vid with camstudio http://download.com.com/3000-2194-10067101.html .... best way to learn is to be shown imho

3) I would like to see more people making vids like this one... just imagine how much faster we will learn if we all help each other thats the whole point of this community and with so many people on high bandwidth we can really begin to utilise vid tuts ... they dont have to be major, this one took me 20 minutes to do and you all know that vid tuts are a great and more importantly fast way to learn the software... put it this way... i will if you will :P

4)There is a lot of loss on the vid but that should not be much of a problem if you have bothered to go through what I would consider the basics, for instance knowing where I am going without having to see the names of the buttons clearly. This is prob not the best video if you dont know how to open the atribute editor or know your way around the render globals.

5) My aim was to show you some of my most used sectors within maya for this technique .

Let me know what you think :D
johnnynightlife
11-05-2003, 12:23 AM
:blush:

the default light was not turned off, and my area light was waaaaayy to high intensity
CGTalk Moderation
01-16-2006, 12:00 PM
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.