Add some compatibility for unicopia

src/main/java/com/minelittlepony/api/model/IPart.java

@@ -3,6 +3,8 @@ package com.minelittlepony.api.model;
 import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.client.util.math.MatrixStack;
 
+import java.util.UUID;
+
 public interface IPart {
     /**
      * Sets the model's various rotation angles.
@@ -11,6 +13,13 @@ public interface IPart {
 
     }
 
+    @Deprecated
+    default void setRotationAndAngles(boolean goingFast, UUID interpolatorId, float limbAngle, float limbSpeed, float bodySwing, float animationProgress) {
+        Compat.attributes.isGoingFast = goingFast;
+        Compat.attributes.interpolatorId = interpolatorId;
+        setPartAngles(Compat.attributes, limbAngle, limbSpeed, bodySwing, animationProgress);
+    }
+
     /**
      * Renders this model component.
      */
@@ -22,4 +31,14 @@ public interface IPart {
     default void setVisible(boolean visible, ModelAttributes attributes) {
 
     }
+
+    @Deprecated
+    default void setVisible(boolean visible) {
+        setVisible(visible, Compat.attributes);
+    }
+
+    @Deprecated
+    class Compat {
+        public static ModelAttributes attributes = new ModelAttributes();
+    }
 }

src/main/java/com/minelittlepony/api/model/ModelAttributes.java

@@ -87,7 +87,7 @@ public class ModelAttributes {
      * Unique id of the interpolator used for this model.
      * Usually the UUID of the entity being rendered.
      */
-    private UUID interpolatorId = UUID.randomUUID();
+    UUID interpolatorId = UUID.randomUUID();
 
     /**
      * The actual, visible height of this model when rendered.

src/main/java/com/minelittlepony/client/model/ClientPonyModel.java

@@ -9,6 +9,7 @@ import net.minecraft.util.Hand;
 import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.api.model.ModelAttributes;
+import com.minelittlepony.api.model.IPart;
 import com.minelittlepony.api.model.fabric.PonyModelPrepareCallback;
 import com.minelittlepony.api.pony.IPony;
 import com.minelittlepony.api.pony.IPonyData;
@@ -48,6 +49,7 @@ public abstract class ClientPonyModel<T extends LivingEntity> extends MsonPlayer
 
     @Override
     public void updateLivingState(T entity, IPony pony, ModelAttributes.Mode mode) {
+        IPart.Compat.attributes = attributes;
         child = entity.isBaby();
         attributes.updateLivingState(entity, pony, mode);
         PonyModelPrepareCallback.EVENT.invoker().onPonyModelPrepared(entity, this, mode);

src/main/java/com/minelittlepony/client/render/LevitatingItemRenderer.java

@@ -21,6 +21,17 @@ import net.minecraft.util.math.RotationAxis;
 import net.minecraft.world.World;
 
 public class LevitatingItemRenderer {
+    @Deprecated
+    private static int COLOR;
+    @Deprecated
+    public static boolean isEnabled() {
+        return false;
+    }
+    @Deprecated
+    public static RenderLayer getRenderLayer(Identifier texture) {
+        return MagicGlow.getColoured(texture, COLOR);
+    }
+
     private VertexConsumerProvider getProvider(IPony pony, VertexConsumerProvider renderContext) {
         final int color = pony.metadata().getGlowColor();
         return layer -> {
@@ -41,6 +52,8 @@ public class LevitatingItemRenderer {
 
             IPony pony = IPony.getManager().getPony((PlayerEntity)entity);
 
+            COLOR = pony.metadata().getGlowColor();
+
             matrix.push();
 
             boolean doMagic = MineLittlePony.getInstance().getConfig().fpsmagic.get() && pony.hasMagic();