volker böhm

i'm using a pixelated image as a texture to a gridshape (opencylinder).

i use the alpha channel of the texture to achieve transparency , so 

that one can see inside or even through the cylinder if the pixel 

but only if i look at the cylinder in a certain angle. e.g. if i look 

from above down on the cylinder it works, but not if i look from below.

i noticed these "planes" appearing inside the cylinder that finally 

they are obviously connected to the dimension count - but i don't get 

yes, my understanding of openGL is quite limited and i could use a 

attached is a patch that hopefully demonstrates what i mean.

give it a slight shove up or down to rotate the cylinder.

i'm using a pixelated image as a texture to a gridshape (opencylinder).
i use the alpha channel of the texture to achieve transparency , so  
that one can see inside or even through the cylinder if the pixel  
values are dark.

this works fine with blend enable etc.
but only if i look at the cylinder in a certain angle. e.g. if i look  
from above down on the cylinder it works, but not if i look from below.
i noticed these "planes" appearing inside the cylinder that finally  
"kill" my wonderful transparency.
they are obviously connected to the dimension count - but i don't get  
it where/why they come from?

yes, my understanding of openGL is quite limited and i could use a  
hint for the right direction.

attached is a patch that hopefully demonstrates what i mean.
give it a slight shove up or down to rotate the cylinder.

transparency-of-a-texture

turning off depth_enable and setting the blend_mode to 6 5 or 6 1 seems to do the trick. unless i misunderstand...

On 14 Jul 2008, at 19:27, Robert Ramirez wrote:

> turning off depth_enable and setting the blend_mode to 6 5 or 6 1 

> seems to do the trick. unless i misunderstand...

> ______________________________________________

thanks, robert. i tried that and it works.

however, what i liked about mod 6 4 is that the original shape of the 

On 14 Jul 2008, at 19:27, Robert Ramirez wrote:
>
> turning off depth_enable and setting the blend_mode to 6 5 or 6 1  
> seems to do the trick. unless i misunderstand...
> ______________________________________________

thanks, robert. i tried that and it works.
however, what i liked about mod 6 4 is that the original shape of the  
cylinder is still present.
but this obviously is not possible.
volker.


transparency of a texture