This is probably a dumb question, but how do I make a custom fluid translucent? I have a custom fluid that is functional and is taking the texture I give it, but is not taking into account the opacity of the .png file. What simple thing have I overlooked this time?  Thanks in advance!

You can make your custom implementation for fluid block/

Pardon my ignorance here, since graphics are definitely not my strong suit, but I don't see how extending the class will help with the opacity. I haven't seen a method in the FluidBlockClassic class that I could override that would cause the desired effect and I'm pretty sure I can't write my own method to do it either.

Sorry, I misunderstood your post; What do you mean by 'not taking into account the opacity of the .png file'?

Does it ignore alpha channel?

Correct. The fluid is functioning as desired, the only issue is with the graphics. I have my .png with an opacity/alpha of 100/255 (using paint.net to do graphics), but the fluid is rendering as a solid block.

Wait, what is the opacity value? I think there is only RGB + Alpha data on png file.

Well, I re-opened my .png and it appears the opacity/alpha didn't save correctly... I've found the cause for that and now everything works perfectly! This was embarrassing...