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Forum Index - Help and Advice - Opacity map not working properly under Daylight system?
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3rd May 2008 12:34am
-Vicki
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Vicki

13
Hi everyone, I'm currently working on my second year project.
I planted some trees made with planes+opacity map at the back, it was working fine under no lighting and using default renderer. However as I added Daylight system and using mental Ray, the plane seems to have gone only semi-transparent as shown below.

[IMG]http://i31.tinypic.com/fu75ar.jpg[/IMG]


A few of my tutors are taking sick leave and my classmates weren't able to figure out what's wrong. Please let me know if you need more information or the scene file.

Many thanks smile.gif
Vicki has 13 participation points. Last seen 6 months, 2 weeks ago.
3rd May 2008 10:35am
+Gustave d'Pre
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Steve Martin

3938
Are there any specular highlights on the planes? Make sure they're all turned off. Great tree by the way.
http://www.3dprevis.com
Steve Martin has 3938 participation points. Last seen 20 hours, 33 minutes ago.
3rd May 2008 04:43pm
-Vicki
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Vicki

13
Thank you smile.gif
There weren't any on the planes, after your comment I also tried to turn off all objects' specular highlight, but that didn't work.
I suspect it's something to do with Mr Sun, cause the planes appear "yellow-y", but I can't think of what options under Mr sun would causes this frown.gif
Vicki has 13 participation points. Last seen 6 months, 2 weeks ago.
4th May 2008 04:18am
+Gustave d'Pre
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Steve Martin

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Haha, for a minute there I though you meant Mister Sun like you were giving the sun some sort of anthropomorphic personification. I realise you actually mean mentalray sun. smile.gif

Anyway, I had a crack at opacity mapping a tree onto a plane myself using mr sun and didn't have any problems. Maybe send me the scene file and I'll have a look.
http://www.3dprevis.com
Steve Martin has 3938 participation points. Last seen 20 hours, 33 minutes ago.
4th May 2008 10:37am
+Tyson
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Tyson

1963
opacity mapping doesnt work with Fog. It looks like theres fog in your scene.
render a z-depth pass without the trees and comp it in.
Tyson has 1963 participation points. Last seen 1 hour, 9 minutes ago.
4th May 2008 04:43pm
-Vicki
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Vicki

13
Re Steve:
hehe tongue.gif I have sent the max file to your email address.

Re Tyson:
That's Haze actually, I wonder if that would causes this too frown.gif
Although I did try taking it out, but it made no difference.
Vicki has 13 participation points. Last seen 6 months, 2 weeks ago.
5th May 2008 03:40am
+Gustave d'Pre
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Steve Martin

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I'll have a look.
http://www.3dprevis.com
Steve Martin has 3938 participation points. Last seen 20 hours, 33 minutes ago.
5th May 2008 07:09am
+Gustave d'Pre
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Steve Martin

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ok, I had a look - try unchecking the aerial perspective button. This worked for me.
http://www.3dprevis.com
Steve Martin has 3938 participation points. Last seen 20 hours, 33 minutes ago.
7th May 2008 11:07am
-Vicki
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Vicki

13
Thank you very much, it works smile.gif
Vicki has 13 participation points. Last seen 6 months, 2 weeks ago.
9th May 2008 10:12am
+Tyson
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Tyson

1963
Just a correction to my comment about transparency not working with environment fog.
It does work but you have to tick the exponential check box in the fog parameters.
Tyson has 1963 participation points. Last seen 1 hour, 9 minutes ago.
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