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There are 9 replies to this topic
This topic is solved

-Vicki
Junior Member

4 years ago

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][Link to i31.tinypic.com][/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

+Steve Martin
Moderator

4 years ago

Are there any specular highlights on the planes? Make sure they're all turned off. Great tree by the way.

[Link to www.3dprevis.com]
2nd Place: Absurd Plants Challenge

-Vicki
Junior Member

4 years ago

Thank you

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

+Steve Martin
Moderator

4 years ago

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.

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.

[Link to www.3dprevis.com]
2nd Place: Absurd Plants Challenge

-Tyson
Senior Member

4 years ago

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.

-Vicki
Junior Member

4 years ago

Re Steve:
hehe

I have sent the max file to your email address.

Re Tyson:
That's Haze actually, I wonder if that would causes this too

Although I did try taking it out, but it made no difference.

+Steve Martin
Moderator

4 years ago

I'll have a look.

[Link to www.3dprevis.com]
2nd Place: Absurd Plants Challenge

+Steve Martin
Moderator

4 years ago

ok, I had a look - try unchecking the aerial perspective button. This worked for me.

[Link to www.3dprevis.com]
2nd Place: Absurd Plants Challenge

-Vicki
Junior Member

4 years ago

Thank you very much, it works

-Tyson
Senior Member

4 years ago

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.

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