Add potential support for models defining 'vanilla like' rotations in Forge's Modified Blockstate format.

src/main/java/net/minecraftforge/client/ForgeHooksClient.java

@@ -387,29 +387,6 @@ public class ForgeHooksClient
         modelLoader.onPostBakeEvent(modelRegistry);
     }
 
-    @SuppressWarnings("deprecation")
-    public static Matrix4f getMatrix(ItemTransformVec3f transform)
-    {
-        javax.vecmath.Matrix4f m = new javax.vecmath.Matrix4f(), t = new javax.vecmath.Matrix4f();
-        m.setIdentity();
-        m.setTranslation(TRSRTransformation.toVecmath(transform.translation));
-        t.setIdentity();
-        t.rotY(transform.rotation.y);
-        m.mul(t);
-        t.setIdentity();
-        t.rotX(transform.rotation.x);
-        m.mul(t);
-        t.setIdentity();
-        t.rotZ(transform.rotation.z);
-        m.mul(t);
-        t.setIdentity();
-        t.m00 = transform.scale.x;
-        t.m11 = transform.scale.y;
-        t.m22 = transform.scale.z;
-        m.mul(t);
-        return m;
-    }
-
     private static final Matrix4f flipX;
     static {
         flipX = new Matrix4f();

src/main/java/net/minecraftforge/client/model/ForgeBlockStateV1.java

@@ -945,11 +945,15 @@ public class ForgeBlockStateV1 extends Marker
                     }
                     return ret;
                 }
-                else
+                else if (e.isJsonArray())
                 {
-                    // quaternion
+                    JsonArray array = e.getAsJsonArray();
+                    if (array.size() == 3) //Vanilla rotation
+                        return TRSRTransformation.quatFromXYZDegrees(new Vector3f(parseFloatArray(e, 3, "Rotation")));
+                    else // quaternion
                         return new Quat4f(parseFloatArray(e, 4, "Rotation"));
                 }
+                else throw new JsonParseException("Rotation: expected array or object, got: " + e);
             }
             else if (e.isJsonObject())
             {