Alpha bitmaps

rd13603 · 19-11-2008, 02:36 AM

Hello,

Was testing 2 of the trees from the "Total Textures Vol 10 - Trees And Plants CD" and ran into this issue. Can someone explain what I may be doing incorrectly. I'm using Maya 2009 and when I add the alpha bitmap for a tree to the transparency channel I still get some of the WHITE showing through the single polygon plane. Depending on the lighting angle you do see less of a white effect.

The image enclosed tells the story. What's my issue?

Thanks in advance,
Rich

newhere · 19-11-2008, 09:20 PM

Turn off specularity.

Freespace-3DT · 19-11-2008, 09:24 PM

Make sure your material isn't specular. It might have some shinyness that's causing the unwanted effect.

rd13603 · 20-11-2008, 01:32 AM

Hi guys,

Thanks for such a quick reply guys. Looks like both of you are on the same page. I was using a Blinn which has spec by default so I changed them to lamberts. The results are better but if you check out the new pic you will see white highlights on the tree tops. Can this be improved upon without changing the stock alpha's on the CD. Or should I try graying out the alpha edges?

Again thanks for that quick reply guys,
Looks like this site has active members.

Richard

Freespace-3DT · 20-11-2008, 10:12 AM

Actually, it could be due to the fact that the Diffuse maps have white around the trees. I find it a good habit to edit those images, and make it green around the trees, which should remove that effect.

rd13603 · 21-11-2008, 01:21 AM

Hi Free,

Looks like I'm stuck doing some real work in the real world. I thought the images on these DVD would have already been tweeked.

Thanks for your feedback,
Rich

McKronic · 18-12-2008, 08:09 AM

Im not a max user but is there any pre-multiply or filter settings that get applied to textures? If so try to turn them off, also max could by default be applying a slight blur which may be messing up the alpha causing the white border.

rd13603 · 18-12-2008, 11:57 AM

Hi McKronic,

Actually I use Maya 2009. I just saw your demo reel and noticed that you also use maya. I'm using a lambert shader (no spec). Any other ideas on what settings to use in maya to get better results?

Richard

rd13603 · 18-12-2008, 11:59 AM

I'm from Mississauga, Ontario. Currently working on a CGI pilot for TV.

19-11-2008, 02:36 AM	#1
rd13603 Registered User Join Date: Nov 2008 Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Alpha bitmaps Hello, Was testing 2 of the trees from the "Total Textures Vol 10 - Trees And Plants CD" and ran into this issue. Can someone explain what I may be doing incorrectly. I'm using Maya 2009 and when I add the alpha bitmap for a tree to the transparency channel I still get some of the WHITE showing through the single polygon plane. Depending on the lighting angle you do see less of a white effect. The image enclosed tells the story. What's my issue? Thanks in advance, Rich Attached Images

19-11-2008, 09:20 PM	#2
newhere Work, art and videogames Join Date: Mar 2007 Location: Boston, Massachusettes Posts: 1,235 Thanks: 10 Thanked 5 Times in 4 Posts Awards Showcase Total Awards: 7	Turn off specularity. __________________ "Life is like a video game that you have to play seriously. You can't just push the start button if you fail and come back in with everything you know or everything you have gained over a period of time." ~Newhere~ Angel Mars (Nudity) http://forums.3dtotal.com/showthread.php?t=75414 Queen's Blade Vol. 12 ~ Cattleya http://forums.3dtotal.com/showthread.php?t=62172 Dominance War V - God Of Enlightenment: http://forums.3dtotal.com/showthread.php?t=82875

19-11-2008, 09:24 PM	#3
Freespace-3DT Commando Moderator Join Date: Apr 2005 Location: Romania, Cluj Posts: 7,988 Thanks: 39 Thanked 184 Times in 157 Posts Awards Showcase Total Awards: 10	Make sure your material isn't specular. It might have some shinyness that's causing the unwanted effect. __________________ Cinematics: StarCraft: Final Metamorphosis (Final 7.5 Minute CG Animation) Speed Factor 2 (23-NOV-2010) Demo Reel 2010 (1-OCT-2010) StarCraft: First Contact (08-JUL-2009) MY CG&VFX WEBSITE

20-11-2008, 01:32 AM	#4
rd13603 Registered User Join Date: Nov 2008 Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Alpha Bitmaps - Much closer Hi guys, Thanks for such a quick reply guys. Looks like both of you are on the same page. I was using a Blinn which has spec by default so I changed them to lamberts. The results are better but if you check out the new pic you will see white highlights on the tree tops. Can this be improved upon without changing the stock alpha's on the CD. Or should I try graying out the alpha edges? Again thanks for that quick reply guys, Looks like this site has active members. Richard Attached Images

20-11-2008, 10:12 AM	#5
Freespace-3DT Commando Moderator Join Date: Apr 2005 Location: Romania, Cluj Posts: 7,988 Thanks: 39 Thanked 184 Times in 157 Posts Awards Showcase Total Awards: 10	Actually, it could be due to the fact that the Diffuse maps have white around the trees. I find it a good habit to edit those images, and make it green around the trees, which should remove that effect. __________________ Cinematics: StarCraft: Final Metamorphosis (Final 7.5 Minute CG Animation) Speed Factor 2 (23-NOV-2010) Demo Reel 2010 (1-OCT-2010) StarCraft: First Contact (08-JUL-2009) MY CG&VFX WEBSITE

21-11-2008, 01:21 AM	#6
rd13603 Registered User Join Date: Nov 2008 Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Hi Free, Looks like I'm stuck doing some real work in the real world. I thought the images on these DVD would have already been tweeked. Thanks for your feedback, Rich

18-12-2008, 08:09 AM	#7
McKronic Lighter/Compositor Join Date: Aug 2005 Location: Halifax,Canada Posts: 614 Thanks: 2 Thanked 9 Times in 8 Posts Awards Showcase Total Awards: 3	Im not a max user but is there any pre-multiply or filter settings that get applied to textures? If so try to turn them off, also max could by default be applying a slight blur which may be messing up the alpha causing the white border. __________________ Check me out on DeviantArt! - http://mckronic.deviantart.com/ 2009 Demo on youtube - http://www.youtube.com/watch?v=9QaxYcy6VBI

18-12-2008, 11:57 AM	#8
rd13603 Registered User Join Date: Nov 2008 Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Hi McKronic, Actually I use Maya 2009. I just saw your demo reel and noticed that you also use maya. I'm using a lambert shader (no spec). Any other ideas on what settings to use in maya to get better results? Richard

18-12-2008, 11:59 AM	#9
rd13603 Registered User Join Date: Nov 2008 Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	I'm from Mississauga, Ontario. Currently working on a CGI pilot for TV.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode