No transparenzy with GL_DEPTH_TEST

OpenGL Development JOGL Development
#1

Hello,
I have a problem by non-displaying transparent regions of my textures.
After i used GL_DEPTH_TEST my transparent regions became black or the background color.
I read something about double rendering but i dont get it how it works corectly.
I tryed:


glDephtFunc(GL_GREATER)
glDephtMask(false);

FIRST RENDERING

glDepthFunc(GL_LEQUAL);
glDepthMask(true);

SECOUND RENDERING

The result of that was that they are still overlapping each other.
Heres my actual result of my system:
(rendered 1 time with GL_LEQUAL and DepthMask true)

http://imagesload.net/img/dasdasdwerdfwe2333344343fsdf.png

(the number shows u the order in that i rendered the objects)
My blending:
gl.glBlendFunc(GL.GL_SRC_ALPHA,GL.GL_ONE_MINUS_SRC_ALPHA);

It would be very welcomed if this method is the badder 1 of some easy methods.
I dont think that im able to split my polygons in smaller 1 so they dont overlap each other.

#2

If you’d have a less offensive nickname, I’d have said you’d need glAlphaFunc(), but now I don’t really feel like it.

#3

Thx i will try around with it.
(my nickname does not mean that i wanna kill u :persecutioncomplex:)
i didnt modify the AlphaFunc so it should be GL_ALWAYS.
The textures have an alpha channel and they are transparent, but they delete some party of the other textures.
What i dont understand is why they always delete 1 texture and leave the rest in peace?

http://imagesload.net/img/dasdasdae3323rfgrtbvgrt.png

This picture shows the first rendered battler behind the secounds rendered, they dont erase some regions of each other, only if i put the first rendered in front of the secound rendered some parts of the secound rendered will be delete

#4

If you do not use glAlphaFunc, the depth value of transparent fragments (pixels) will be written to the depthbuffer.

Therefore you must depth-sort your triangles, when using transparency. Intersecting triangles can never be correctly depth-sorted.

If you use glAlphaFunc, fragments with a transparency below/above X will not be rendered, and not written to the depthbuffer, resulting in the ‘transparent’ parts to be cut off the sprite, which allows intersecting geometry.

#5

I dont realy get it :confused:
i used: glAlphaFunc(GL_EQUAL,1f);
but it didnt changed anything.

Edit: nvm, it was a result of my stupidity…
forgot to enable ALPHA_TEST.
Thx for ur help ^^
(Can i change my name or do i have to wait until i can change it?)

#6

Just say the name you wish to have, I can change it for you.

#7

Bananni
that would be a nice name :3
thx :slight_smile:

#8

what was his name before?

#9

glAlphaFunc(GL_EQUAL,1f);
can sometimes be in accurate.
I find that using
glAlphaFunc(GL_GREATER, 0.99f);
more effective

#10

What’s hilarious is that I can’t do this.

No joke.

The permissions on this forum are very messed up.