The Meaning of Life, the Universe, and Everything.
I found a way! Go to assets/minecraft/models/block and replace whatever block you're trying to edit with a copy of ladder.json. Then, rename the copy to the name of whatever block you're trying to edit. Open the copy in the model editor and it'll work.
Maybe I screwed something up but the interaction became really buggy after I had a fair amount of elements going. I'd try to click on one of the elements on the right side via the 3D viewing box and it would select an element on the completely opposite end! Driving me nuts and become really frustrating since I have no clue why. Tried restarting it but that didn't seem to work.
I'm having the same issue as Defamatory here. Selecting the elements in the face views works, but not in the 3D perspective, which is annoying when certain sides (Bottom, East, North) don't have a view.
Suggestions for fixes: Tab to switch between elements, or ability to customize the face views. Otherwise, it can be near impossible to work on UVs/Textures.
Using windows 10, Core i5 3.1 Ghz with 4 GB RAM, Java Version 8, Build 141
After a restart of my entire PC, I was able to reselect the right pieces until I started placing more. In addition, Minecraft 1.12 doesn't seem to be accepting the models at all, even though there are no errors at this point so I seem to be kind of stuck. I may have to seek help elsewhere on that front, as I know custom models do work in 1.12 (I have another resource pack that uses them!)
Update 2: Disregard 1.12 not taking the models....
Is there a way this can be used to make .java models? Like, persay, for MCreator users?
Not currently. Opl has stated several times that the program exists as-is until it's rewritten from scratch. Since that may or may not ever happen, you should assume that it's just not possible and move on.
Being a 3D maker is a fun adventure. However, when I downloaded the latest version, I could only make a 3D ladder. It said for when I was trying to build a 3D oak door, that 'Cannot recognize that file', or omething like that. I haven't read every reply and comment here, but I was wondering if there was a version that accepted every minecraft > assets (1.8) > models > blocks.JSON files. Thanks.