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Blending question

Started by Xano Oct 29, 2005 at 7:17 AM 11 replies 800+ views

Original Post

Oct 29, 2005 at 7:17 AM

Hi, about the lesson 09. There it says that blending is a way of erasing the black shape around the images. I tried to do this on my own image, but then it got transparent too. Is there a way of making an image not transparent and the black shape is gone?

CRACK123

Oct 29, 2005 at 7:23 AM

Yes, use alpha testing.

Xano

Author

Xano

Oct 29, 2005 at 7:28 AM

Erm and exactly how I do that? :P

Pipo DeClown

156

Pipo DeClown

Oct 29, 2005 at 7:44 AM

http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=32

Download the tutorial, it's funny game! =P

CRACK123

Oct 29, 2005 at 8:02 AM

You will have to use glAlphaFunc and enable GL_ALPHA_TEST.

Xano

Author

Xano

Oct 29, 2005 at 8:03 AM

Could you show me the code? I don't really know how to "use" glAlphaFunc

Thanks :)

CRACK123

Oct 29, 2005 at 8:11 AM

Well it would go something like this :-

glAlphaFunc(GL_GREATER, 0.1);
glEnable(GL_ALPHA_TEST);

It may or may not work for you. You can also look at what Pipo suggested.

Xano

Author

Xano

Oct 29, 2005 at 8:47 AM

Quote:
Original post by CRACK123
Well it would go something like this :-

glAlphaFunc(GL_GREATER, 0.1);
glEnable(GL_ALPHA_TEST);

It may or may not work for you. You can also look at what Pipo suggested.

Didn't work.. Can't any expert help me out here? :/