Maya for 3D Printing - Rapid Prototyping
In this course we're going to look at something a little different, creating technically accurate 3D printed parts.
# 1 27-11-2005 , 02:19 PM
MattTheMan's Avatar
Registered User
Join Date: Apr 2005
Location: Fairfield, CT
Posts: 2,436

Odd Reflection Problems

Well I have a question about Mental Rey Dialectic Materials and HDRI. I have rendered this ball /marble thing in Mental ray using the all popular Uffizi HDR image. The ball is a dialectic material. Now, the question is, how come the clearest reflcetions are on the bottom? The plane underneath is a Phong E with reflections around 0.060. And why are there 3 seperate reflections on the top??? Anyone wish to clarify? I'm sure this can't be realistic at all!

Attached Thumbnails

Live the life you love, love the life you live

Last edited by MattTheMan; 27-11-2005 at 04:00 PM.
# 2 27-11-2005 , 04:49 PM
mayafreak3's Avatar
Registered User
Join Date: Jun 2005
Location: inside
Posts: 369

Re: Odd Reflection Problems

Originally posted by MattTheMan
Well I have a question about Mental Rey Dialectic Materials and HDRI. I have rendered this ball /marble thing in Mental ray using the all popular Uffizi HDR image. The ball is a dialectic material. Now, the question is, how come the clearest reflcetions are on the bottom? The plane underneath is a Phong E with reflections around 0.060. And why are there 3 seperate reflections on the top??? Anyone wish to clarify? I'm sure this can't be realistic at all!

Now, the question is, how come the clearest reflcetions are on the bottom?

My guess is that it is because the floor surface is reflective being a phong E shader. The sphere recieves a reflection of the scene from the ibl node and a reflection of the scene from the floor, increasing the intensity of the reflection on the sphere on the bottom half.. the top half only gets a reflection from the ibl node.

unsure on the second question..

You might try a re-render with a lambert shader on the floor and hide the primary visibility for the ibl node. Just to compare..

mayafreak3

# 3 27-11-2005 , 05:46 PM
MattTheMan's Avatar
Registered User
Join Date: Apr 2005
Location: Fairfield, CT
Posts: 2,436
OK man thanks will do!


Live the life you love, love the life you live
# 4 27-11-2005 , 05:55 PM
MattTheMan's Avatar
Registered User
Join Date: Apr 2005
Location: Fairfield, CT
Posts: 2,436
Well, this time I rendered this with the IOR setting on 2.0. The thing is that EVEN WITH THAT, which I am pretty sure is the opacity of the shader, still the clearest reflections come out on the bottom. The plane underneath is Lambert 1. THanks for yer help so far Mayafreak, user added image

Attached Thumbnails

Live the life you love, love the life you live
# 5 27-11-2005 , 11:01 PM
NextDesign's Avatar
Technical Director
Join Date: Feb 2004
Posts: 2,988
heres a quick and dirty solution. just delete the bottom half of the hdri image user added image


Imagination is more important than knowledge.
# 6 28-11-2005 , 01:28 AM
Registered User
Join Date: Jul 2004
Location: Northern California
Posts: 445
Hey Matt

Your render looks fine to me. Just looks like refraction not reflection.

Dave

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