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Old 10-01-2013, 03:08 PM   #1
knekker
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MR Image Based Lighting within Maya.

Hello there,

I want to use image based lighting setup within maya via Mental Ray, using a low res and blurred hdr map for fast and best lighting result.
But in order to get detailed reflections, I want to use a high res detailed image seperately from other low res hdr map.

Doing it via Vray is easy, as the Environment setting has seperate texture slots for Lighting and Reflections, but how would you make such a setup when using the Image Based Lighting Dome setup that comes with MR? Adding a seperate sphere with the high res map applied to it, seems to block the light coming from the Image based Lighting dome, despite having the sphere set to only show reflections.


Any help on the matter is much appreciated.

Last edited by knekker : 10-01-2013 at 03:20 PM.
 
Old 10-01-2013, 04:38 PM   #2
Panupat
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Yes Vray is super simple.

When we need to use MR, we still use the classic 2 sphere maps and change the "affect reflections" attribute.
 
Old 10-02-2013, 09:33 AM   #3
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Hello,

Your approach is the method i am trying to repeat in MR, but without success, cause I cannot get the Reflection Sphere to only cast Reflection. without also casting light, when Final Gather is activated. It's strange that in the Render stats of the Refl Sphere, there is no option to tell it not to cast light.

I tried playing around with the Env_Ball shdr node and add it into the Reflection Color of the Objects in the scene, This gives me what I want but with the downside that I am having a hard time controling the reflection cordinates. That is why I want to use a sphere to control it.

Last edited by knekker : 10-06-2013 at 06:18 PM.
 
Old 10-03-2013, 09:31 PM   #4
asianrage
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Have you thought about using a rayswitch (with separate slots for diffuse, reflection, refraction, etc) and plug that into the Environment node in the mental ray section of the rendering camera.

This is a very good setup and you can see it being implemented successfully at the link below

http://www.hdrlabs.com/sibl/index.html
 
Old 10-06-2013, 01:46 PM   #5
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I never heard about rayswitch until you mention it, I just tried it and it gives me the quality look and control that I need.

Thank you for bringing this up Asianrage.
 
Old 10-06-2013, 01:46 PM   #6
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