[MC-50769] Mooshrooms incorrectly display custom mushroom models

Yes, I broke the models again.

Mushrooms on the backs of mooshrooms display the "cubes" incorrectly.

It seems to lack shading and display the backs instead of the front, bit of z-fighting.

Steps to reproduce:

Apply a custom red mushroom model that contains cubes rather than plains, or download the debug pack
Spawn a mooshroom
Look at the mushrooms on the mooshroom's back, notice the cubes appear inside-out

Linked issues

KnightMiner 2014-03-10T16:37:39Z

Here is a pack with the custom model so you can test it yourself.

insomniac_lemon 2014-03-14T23:21:15Z

I've attached a new screenshot showing the issue a bit better.

KnightMiner 2014-03-15T03:23:01Z

Thanks, could not get my mooshroom to stay still. (and my model is less complex)

KnightMiner 2014-03-15T03:30:10Z

Based on a post form the minecraft forum (a mistake made), and a weird test, I found the exactly what it is doing:

Mooshrooms are inverting the cube coordinates and removing all shading, with a bit of removal of rendering order.

KnightMiner 2014-06-18T21:20:50Z

It will take be a bit to test this bug in the latest version, as I must convert my models to the latest version

KnightMiner 2014-06-19T21:00:52Z

New debug pack using the new model format