Fixed camera jitter while on chair

src/main/java/org/valkyrienskies/mod/common/entity/EntityMountable.java

@@ -190,7 +190,7 @@ public void readSpawnData(ByteBuf additionalData) {
         }
     }
 
-    Optional<BlockPos> getReferencePos() {
+    public Optional<BlockPos> getReferencePosOptional() {
         return Optional.ofNullable(referencePos);
     }
 

src/main/java/org/valkyrienskies/mod/common/entity/EntityMountableChair.java

@@ -20,7 +20,7 @@ public EntityMountableChair(World world, Vec3d mountPos,
 
     @Override
     public void onUpdate() {
-        if (!getReferencePos().isPresent()) {
+        if (!getReferencePosOptional().isPresent()) {
             // Some error occurred, kill this chair.
             new IllegalStateException("Chair mountable entity has no reference position.")
                 .printStackTrace();

src/main/java/org/valkyrienskies/mod/common/ships/entity_interaction/EntityCollisionInjector.java

@@ -28,6 +28,7 @@
 import org.valkyrienskies.mod.common.collision.PhysPolygonCollider;
 import org.valkyrienskies.mod.common.collision.Polygon;
 import org.valkyrienskies.mod.common.collision.ShipPolygon;
+import org.valkyrienskies.mod.common.entity.EntityMountable;
 import org.valkyrienskies.mod.common.entity.EntityShipMovementData;
 import org.valkyrienskies.mod.common.ships.ShipData;
 import org.valkyrienskies.mod.common.ships.ship_transform.ShipTransform;
@@ -42,6 +43,7 @@
 import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Optional;
 
 public class EntityCollisionInjector {
 
@@ -259,6 +261,19 @@ public static IntermediateMovementVariableStorage alterEntityMovement(Entity ent
         entity.setEntityBoundingBox(axisalignedbb);
         entity.resetPositionToBB();
 
+        // We are on the ship that we are riding
+        if (entity.ridingEntity instanceof EntityMountable) {
+            final EntityMountable entityMountable = (EntityMountable) entity.ridingEntity;
+            if (entityMountable.getReferencePosOptional().isPresent()) {
+                final Optional<PhysicsObject> physicsObjectOptional = ValkyrienUtils.getPhysoManagingBlock(
+                        entity.world, entityMountable.getReferencePosOptional().get()
+                );
+                if (physicsObjectOptional.isPresent()) {
+                    worldBelow = physicsObjectOptional.get();
+                }
+            }
+        }
+
         if (worldBelow == null) {
             return null;
         }