I am trying to render a cube that varys its tranperency (starts by alpha=0 to alpha =1) that is working but if i look through the cube i cant see things that use transperency themself. Like water, glass blocks or so.

While blocks like Ice or tinted glass do not have this issue. Is there an OpenGl option that fixes that? Or if not another solution?

Welcome to the quest to find the holy grail of computing: transparency sorting.

 

Whatever you did (which you didn't show your code) caused the polygons you tried to render to occlude the transparent blocks at a time when the triangle sorting was set to "nearest first".

Here would be my renderer. By disableing the depthTest or depthMask I can achieve what I initialy wanted but it still seems a bit off (And i am not sure its the right way) and the rest of the block (the cube is just a part of one) is always rendered before the cube so that if looked at through the tinted face of the cube the rest does not seems to be affected.

 

https://pastebin.com/gXS6m7iP

In case the full repo is usefull: https://github.com/Orothuin/Forge-Forum-Version

Okay thx for the key-word. I red something about the matter and what i can get from it, is that my current code does render both water and cube because i do not let the cube write to the depth buffer and thus the water is not occluded (And translucent and opaque triangles seem to be handled differently since the opaque blocks are never occluded by the cube). But still I do not sort the alpha triangles correctly so that in the current state water is rendered over the cube but does blend in a bit with the cubes color. Is that somewhere near the truth?

By the way the problem with the rest of the cubes block was, that i set its render layer to (due to the glass part in it) to translucent. Ill just have to render the glass box in the renderer too

Ok that worked I now exclude both the glass box and the cube inside from the depth buffer and it looks well enough. Thanks again for the key-word. Did not had a clue what to look for.