Integrating 3D models with photography
Interested in integrating your 3D work with the real world? This might help
# 1 08-07-2013 , 07:28 PM
PixalZA's Avatar
Lifetime Member
Join Date: May 2011
Location: Riyadh, Saudi Arabia
Posts: 525

Sun and Sky, mia_exposure_photographic and background image

Hi everybody

I am a bit stumped. I have a simple scene lit with MR sun and sky. The default setup uses a mia_exposure_simple node connected to the lens shader of the cameras as well as the mia_physicalsky node. Specifying a background image on the physicalsky node (mib_lookup_spherical + mentalray_texture) works like a charm.

The moment I swap out the mia_exposure_simple node with a mia_exposure_photographic, the scene objects renders ok but the background is black. What am I missing?

The RGB unit conversion is set to 0.318

Attached Thumbnails

Earth: The crazy asylum of the universe.
# 2 08-07-2013 , 08:48 PM
David's Avatar
SM Tea Boy
Join Date: Apr 2002
Location: Prague
Posts: 3,228
with the rgb unit scale set to .318 the background parameter of the exposure photographic does not work as you would expect. As a quick fix set the rgb unit scale down to the default .0001 and set the cm2 factor in the exposure photographic to 10000.000 or something suitable for your scene.

if you grab this tutorial
https://simplymaya.com/autodesk-maya-...ne/?tut_id=308

Somewhere around part 11 i go over using a sphere environment with the correct reflections, the exposure photographic use background wont show in reflections, so it's not the best way to do it.


From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"
# 3 09-07-2013 , 09:48 AM
PixalZA's Avatar
Lifetime Member
Join Date: May 2011
Location: Riyadh, Saudi Arabia
Posts: 525
Thanks David. Exactly what I was looking for.


Earth: The crazy asylum of the universe.
Posting Rules Forum Rules
You may not post new threads | You may not post replies | You may not post attachments | You may not edit your posts | BB code is On | Smilies are On | [IMG] code is On | HTML code is Off

Similar Threads