Transparency

DaMathew · Post by **DaMathew** » Fri Sep 02, 2005 6:20 pm

Hi all!

I've got a model with an alpha-texture, so when i want to make it transparent i'm using the EMT_TRANSPARENT_ALPHA_CHANNEL type, right?
well when i use it it looks like this:

i mean the smoothness... is this possible with the engine?

thank you a lot!
Mathew[/img]

DaMathew · Post by **DaMathew** » Fri Sep 02, 2005 6:21 pm

Ooops sorry

the first pic is:

Armen138 · Post by **Armen138** » Fri Sep 02, 2005 9:32 pm

it looks like image 1 has alpha testing transparancy, while image 2 has alpha blending transparancy. i'm not sure if this works correctly in irrlicht with both opengl and directx, it didn't before i started using irrlichtnx instead(one of the main reasons for the switch)

DaMathew · Post by **DaMathew** » Sat Sep 03, 2005 8:46 am

Thank you for you answer!

The documentation says that EMT_TRANSPARENT_ALPHA_CHANNEL uses alpha blending, so what could it be!?

Elise · Post by **Elise** » Sat Sep 03, 2005 3:13 pm

Well this might be a longshot but is the image in alpha channel smooth or are the edges jagged?

Is it something like this:

or more like this:

(The first one is better)

DaMathew · Post by **DaMathew** » Sat Sep 03, 2005 3:54 pm

Thanks, but i don't think this is the problem, because on both screenshots there is the same alpha channel!

Elise · Post by **Elise** » Sat Sep 03, 2005 5:29 pm

Ok more longshots.

What material settings are you using? Have you tried changeing the MaterialTypeParam? Lower values make the blending smoother.

Also what image format are you using? I haven't been able to get the blending work properly with png images, how about trying a tga image?

DaMathew · Post by **DaMathew** » Sat Sep 03, 2005 5:45 pm

Changing the MaterialTypeParam doesn't have any effect

i'm using tga, i also tried png but both doesn't work

Elise · Post by **Elise** » Sat Sep 03, 2005 6:00 pm

Ok, sorry I'm out of ideas. Can't imagine why it won't work for you. Maybe you can post or send me the texture so I can test it?

DaMathew · Post by **DaMathew** » Sat Sep 03, 2005 6:14 pm

This would be very nice =D http://compandmore.ath.cx/Ch_Schneetanne.tga maybe you'll have more luck

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Elise · Post by **Elise** » Sat Sep 03, 2005 8:06 pm

I don't think there's an easy way to make it blend like in the first picture. I tried to fiddle with it but no luck.

This is the best I could do but I don't think it will look very good: Ch_Schneetanne-2.tga.

Guest · Post by **Guest** » Sat Sep 03, 2005 8:32 pm

elise: are youre a german female?? wow ... a female programmer is already a big _wow_ but a german one is not possible

(just thought youre german because of the name Elise and the Schneetanne-2.tga which are both german words)

DaMathew · Post by **DaMathew** » Sat Sep 03, 2005 8:39 pm

Tahnk you a lot for your effort !!!!

Didn't help much but looks little better now =D

@GFXstyLER: the texture was named by me

puh · Post by **puh** » Sat Sep 03, 2005 8:48 pm

I don't understand the problem. When i load the sample cone with the first texture and use EMT_TRANSPARENT_ALPHA_CHANNEL with MaterialTypeParam=254 all looks very close to the first pic. Could you post your model?

Elise · Post by **Elise** » Sun Sep 04, 2005 8:03 am

GFXstyLER wrote:elise: are youre a german female??

Nope not german, it was DaMathew's file.