BlockState rotation around Z axis not working

[BenignBanana]

Hey everyone,

I tried my hand at some X and Z rotating to save myself a bunch of models on my connected model, but it seems "z": 90 doesn't to anything. "x":90 works just fine and so does "y":90, but z seems to be completely ignored. Why could this be and how can I fix it?

Here's my BlockState (it's a long one):

{
  "forge_marker": 1,
  "variants": {
    "normal": [
      {"model": "kaidencraft:boilertank/single.obj"}
    ],
    "inventory": [
      {}
    ],
    "mb_part": {
      "single": {
        "model": "kaidencraft:boilertank/single.obj"
      },
      "end": {
        "model": "kaidencraft:boilertank/pillar_bottom.obj",
        "x": 90
      },
      "line_edge": {
        "model": "kaidencraft:boilertank/pillar_center.obj",
        "z": 90
      },
      "corner": {
        "model": "kaidencraft:boilertank/end.obj",
        "z": 90
      },
      "edge": {
        "model": "kaidencraft:boilertank/edge_single.obj"
      },
      "center": {
        "model": "kaidencraft:boilertank/center_single.obj"
      },
      "bottom_end": {
        "model": "kaidencraft:boilertank/end.obj"
      },
      "bottom_edge": {
        "model": "kaidencraft:boilertank/edge.obj"
      },
      "bottom_corner": {
        "model": "kaidencraft:boilertank/corner.obj"
      },
      "bottom_center": {
        "model": "kaidencraft:boilertank/center_top.obj",
        "x": 180
      },
      "bottom_pillar": {
        "model": "kaidencraft:boilertank/pillar_bottom.obj"
      },
      "center_end": {
        "model": "kaidencraft:boilertank/edge_single.obj",
        "x": 90, "z": 90
      },
      "center_corner": {
        "model": "kaidencraft:boilertank/edge.obj",
        "z": 90,
        "x": 90
      },
      "center_edge": {
        "model": "kaidencraft:boilertank/center_top.obj",
        "x": 270
      },
      "center_line_edge": {
        "model": "kaidencraft:boilertank/center_single.obj",
        "x": 90
      },
      "center_pillar": {
        "model": "kaidencraft:boilertank/pillar_center.obj"
      },
      "top_end": {
        "model": "kaidencraft:boilertank/end.obj",
        "z": 180
      },
      "top_corner": {
        "model": "kaidencraft:boilertank/corner.obj",
        "x": 180
      },
      "top_edge": {
        "model": "kaidencraft:boilertank/edge.obj",
        "x": 90
      },
      "top_line_edge": {
        "model": "kaidencraft:boilertank/edge_single.obj",
        "x": 90
      },
      "top_pillar": {
        "model": "kaidencraft:boilertank/pillar_bottom.obj",
        "x": 180
      },
      "top_center": {
        "model": "kaidencraft:boilertank/center_top.obj"
      },
      "hidden": {
        "model": "kaidencraft:blank.obj"
      }
    },
    "facing": {
      "north": {},
      "south": {
        "y": 180
      },
      "west": {
        "y": 270
      },
      "east": {
        "y": 90
      }
    }
  },
  "defaults": {
    "model": "kaidencraft:boilertank/single.obj",
    "textures": {
      "#initialShadingGroup": "kaidencraft:block/boiler_main"
    }
  }
}

The part I'm testing with is "corner", which rotates fine when I put in an x rotation, but does nothing when I put in various z rotations.

Cheers in advance

 

Edit for posterity: You can get any transforms you want using forge specific BlockState parts - see Forge Blockstate V1 specs for all details. Only the last specified transform will be applied - this includes simple rotation like you would use in a facing variant.

Edited July 5, 2017 by BenignBanana

[larsgerrits]

Minecraft and Forge didn't add the "z" rotation tag because you can replicate it with a combination of the "x" and "y" tag.

[BenignBanana]

Just now, larsgerrits said:

Minecraft and Forge didn't add the "z" rotation tag because you can replicate it with a combination of the "x" and "y" tag.

Can you tell me how to do that specifically? I'm terrible at 3D visualization and vector math. Also, would the y rotation work additively with the facing?

[larsgerrits]

I haven't done this in a while, but I think that if you set the "y" tag to 90, any rotation on the x-axis will apply to the z-axis instead.

[BenignBanana]

6 minutes ago, larsgerrits said:

I haven't done this in a while, but I think that if you set the "y" tag to 90, any rotation on the x-axis will apply to the z-axis instead.

Yea I figured that out now with some hand moving and loading a test object into Maya  But I'm still struggling to understand how that will interact with the facing property that I use for Y rotation.

[BenignBanana]

Yea this definitely doesn't work. After recreating the BlockState scenarios in Maya it seems that Y is always applied after X, making this trick impossible. Applying y 270 first, then x 90 gives me the correct result in Maya (as it should), but what I see in Minecraft is equivalent to applying x 90 first, then y 270. This is what I did in my JSON:

      "corner": {
        "model": "kaidencraft:boilertank/end.obj",
        "y": 270, "x": 90
      },

 

Edited July 4, 2017 by BenignBanana

[BenignBanana]

Is there no way to do this other than baking the y rotation into a copy of the model?

[Draco18s]

Probably not.

Minecraft does not encode a z-axis rotation as it treats it identically to an x-axis rotation.

[BenignBanana]

Yea I looked at the ModelRotation code. That's some of the most inflexible code I've ever seen. Guess I'll just have to bake it in then. Anyways, thanks for the help.

[BenignBanana]

Just posting one last update here for anyone who sees this in the future. Turns out there IS a way to rotate around the Z axis, it's just really hard to find. I stumbled upon it after googling for blockstate transforms (as in moving the model). See Forge Blockstate V1 specs for all the details. Do keep in mind that any Y rotation you may do in a facing variant will override these transforms.