[PD] [Gem] Alpha: transparency only in one direction?

[IOhannes m zmoelnig]

Roman Haefeli wrote:
> thanks, martin and IOhannes for the hints.
> 
> 
> but this means, if i'd like to cross two rectangles, there is no other
> way to make all parts transparent besides splitting them in separate
> rectangles to set the execution order?

and of course you could change the gemchain with the help of [spigot] to 
render one rectangle after the other one.

> 
> suddenly this is not a real solution when using textures.

this i don't understand.

however i understand that it can be a pain in the a to keep track of the 
positions (and the depth)

mfg.asdr.
IOhannes