user_ibl_env usage

#21

I am having some problems getting the user_ibl_env to work correctly with the mia_env_blur node. I am noticing a distinct brightening of the image when the user_ibl is used with the mia_env_blur. I’ve done a number of tests now and it’s consistent.

If I use the old school workflow of using one diffuse convolved map and one sharp map along with final gather only, the overall brightness of the scene is very similar to the user_ibl setup without the mia_env_blur. Using the old school set up, I can add and remove the mia_env_blur node with no change in brightness happening in my scene. If I do this with the exact same mia_env_blur node with the exact same settings to the user_ibl setup then there is a consistent brightening of the scene.

Have you noticed any of this behavior?

I am only inserting the mia_env_blur between the user_ibl and the environment slot of the camera. Tried inserting it in between the area light connection just to see and it was chaos. So I assumed that was incorrect.

I would like to use the mia_env_blur in conjunction with the user_ibl because it takes care of the fireflies in my light reflections. Even when I crank high on quality with Unified, without the mia_env_blur the reflections of the lights are still ugly.

#22

The mia_envblur connects to the camera environment. Then the user_ibl_env to the mia_envblur.

Be sure the materials are set to ‘single sample’ from the environment.

I have some high resolution maps at work so I have to go to 4096 on the resolution for the env blur. It’s a memory hog.

But I have not noticed a drastic change in lighting.

#23

I’m starting some explanation on on the way to writing up some tips on user ibl

http://forum.mentalimages.com/showthread.php?9470-Can-somebody-explain-new-user-ibl-shaders

#24

Awesome! Thanks for the heads up.

-Justin

#25

Simple tutorial here for user_ibl_env: http://elementalray.wordpress.com/2012/05/07/the-user_ibl-shaders-pt1/

#26

In Maya 2012, where do you find the user_ibl_env shader in the Create Render Node window?

Instructions are:

“Under the mental ray -> Custom Shaders attach a user_ibl_env shader to the Light Shader connection”

I click on the Light Shader swatch, a Create Render Node window opens. But I don’t see the user_ibl_env

#27

U have to unhinde hidden shaders to see it.

Mel command

optionVar -intValue “MIP_SHD_EXPOSE” 1

#28

Ran your MEL command in the script editor, but the Create Render Node choices under MR seem the same. Where is user_ibl_env shader under?

#29

Run it from script editor mel command and restart maya.

Then just type in search box and it should pop up.

#30

Ran Script, restarted. Not found. Running on 2012 a problem, maybe?

#31

User_ibl_env is only on maya 2013 and mr 3.10. You could use native ibl with string option in 2012.

#32

Installed 2013. Can you use a Vertical Cross Cube Format instead of a LatLong HDR?

#33

user_ibl only supports latlong.

#34

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