Hook into MineLP to fix rotation whilst flying

src/main/java/com/minelittlepony/unicopia/client/minelittlepony/Main.java

@@ -0,0 +1,28 @@
+package com.minelittlepony.unicopia.client.minelittlepony;
+
+import com.minelittlepony.client.render.EquineRenderManager;
+import com.minelittlepony.model.IModel;
+import com.minelittlepony.model.capabilities.fabric.PonyModelPrepareCallback;
+import com.minelittlepony.unicopia.entity.player.Pony;
+
+import net.fabricmc.api.ClientModInitializer;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.PlayerEntity;
+
+public class Main implements ClientModInitializer {
+
+    @Override
+    public void onInitializeClient() {
+        PonyModelPrepareCallback.EVENT.register(this::onPonyModelPrepared);
+    }
+
+    private void onPonyModelPrepared(Entity entity, IModel model, EquineRenderManager.Mode mode) {
+        if (entity instanceof PlayerEntity) {
+            Pony pony = Pony.of((PlayerEntity)entity);
+
+            model.getAttributes().isSwimming |= pony.getMotion().isFlying();
+            //model.getAttributes().isSwimmingRotated |= pony.getMotion().isFlying();
+            model.getAttributes().isGoingFast |= pony.getMotion().isRainbooming();
+        }
+    }
+}

src/main/java/com/minelittlepony/unicopia/entity/player/Motion.java

@@ -11,6 +11,8 @@ public interface Motion {
 
     boolean isGliding();
 
+    boolean isRainbooming();
+
     float getWingAngle();
 
     PlayerDimensions getDimensions();

src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java

@@ -4,6 +4,7 @@ import com.minelittlepony.unicopia.FlightType;
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.USounds;
 import com.minelittlepony.unicopia.ability.magic.Spell;
+import com.minelittlepony.unicopia.ability.magic.spell.JoustingSpell;
 import com.minelittlepony.unicopia.entity.Creature;
 import com.minelittlepony.unicopia.entity.EntityPhysics;
 import com.minelittlepony.unicopia.entity.Jumper;
@@ -73,6 +74,11 @@ public class PlayerPhysics extends EntityPhysics<Pony> implements Tickable, Moti
         return isFlying() && (pony.getMaster().isSneaking() || ((Jumper)pony.getMaster()).isJumping()) && !pony.sneakingChanged();
     }
 
+    @Override
+    public boolean isRainbooming() {
+        return pony.getSpellOrEmpty(JoustingSpell.class).isPresent();
+    }
+
     @Override
     public float getWingAngle() {
         float spreadAmount = -0.5F;

src/main/resources/fabric.mod.json

@@ -24,6 +24,9 @@
     ],
     "modmenu": [
       "com.minelittlepony.unicopia.modmenu.UMenuFactory"
+    ],
+    "minelittlepony": [
+      "com.minelittlepony.unicopia.client.minelittlepony.Main"
     ]
   },
   "depends": {