teleporting???

src/main/java/io/github/fusionflux/portalcubed/content/portal/Portal.java

@@ -14,6 +14,7 @@
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Nullable;
 import org.joml.Quaternionf;
+import org.joml.Vector3d;
 
 import java.util.Optional;
 import java.util.UUID;
@@ -105,6 +106,14 @@ public boolean isActive() {
 		return this.linked != null;
 	}
 
+	public Vector3d relativize(Vector3d pos) {
+		return pos.sub(origin.x, origin.y, origin.z);
+	}
+
+	public Vector3d derelativize(Vector3d pos) {
+		return pos.add(origin.x, origin.y, origin.z);
+	}
+
 	/**
 	 * Do not use, use the portal manager
 	 */

src/main/java/io/github/fusionflux/portalcubed/content/portal/manager/PortalManager.java

@@ -15,6 +15,7 @@
 import io.github.fusionflux.portalcubed.framework.util.TransformUtils;
 
 import org.jetbrains.annotations.Nullable;
+import org.joml.Vector3d;
 
 import java.util.List;
 import java.util.Objects;
@@ -65,13 +66,24 @@ private PortalHitResult clipPortal(Portal portal, Vec3 start, Vec3 end) {
 		if (linked == null) // this shouldn't happen
 			return null;
 		// portals cannot be interacted with from behind
-//		Vec3 delta = end.subtract(start);
-//		if (delta.dot(portal.normal) > 0)
-//			return null;
+		Vec3 delta = end.subtract(start);
+		if (delta.dot(portal.normal) > 0)
+			return null;
 		return portal.plane.clip(start, end).map(hit -> {
-			Vec3 teleportedHit = TransformUtils.applyDual(portal.rotation::transformInverse, linked.rotation::transform, hit);
+			Vec3 teleportedHit = TransformUtils.apply(hit,
+					portal::relativize,
+					portal.rotation::transformInverse,
+					linked.rotation::transform,
+					linked::derelativize
+			);
 			Vec3 remainder = end.subtract(hit);
-			Vec3 teleportedEnd = TransformUtils.applyDual(portal.rotation::transformInverse, linked.rotation::transform, remainder);
+			Vec3 teleportedEnd = TransformUtils.apply(remainder,
+					portal::relativize,
+					portal.rotation::transformInverse,
+					linked.rotation::transform,
+					linked::derelativize,
+					portal::derelativize
+			);
 
 			return new PortalHitResult(start, teleportedEnd, hit, teleportedHit, portal, linked);
         }).orElse(null);

src/main/java/io/github/fusionflux/portalcubed/framework/util/TransformUtils.java

@@ -7,15 +7,12 @@
 import net.minecraft.world.phys.Vec3;
 
 public class TransformUtils {
-	public static Vec3 apply(UnaryOperator<Vector3d> function, Vec3 input) {
-		Vector3d asJomlVec = new Vector3d(input.x, input.y, input.z);
-		Vector3d result = function.apply(asJomlVec);
-		return new Vec3(result.x, result.y, result.z);
-	}
-
-	public static Vec3 applyDual(UnaryOperator<Vector3d> func1, UnaryOperator<Vector3d> func2, Vec3 input) {
-		Vector3d asJomlVec = new Vector3d(input.x, input.y, input.z);
-		Vector3d result = func2.apply(func1.apply(asJomlVec));
+	@SafeVarargs
+	public static Vec3 apply(Vec3 input, UnaryOperator<Vector3d>... functions) {
+        Vector3d result = new Vector3d(input.x, input.y, input.z);
+		for (UnaryOperator<Vector3d> function : functions) {
+			result = function.apply(result);
+		}
 		return new Vec3(result.x, result.y, result.z);
 	}
 }

src/main/java/io/github/fusionflux/portalcubed/mixin/EntityMixin.java

@@ -41,19 +41,20 @@ public abstract class EntityMixin {
 			)
 	)
 	private void moveThroughPortals(Args args) {
-		if (this.getType().is(PortalCubedEntityTags.PORTAL_BLACKLIST))
+		Level level = level();
+		if (level.isClientSide || this.getType().is(PortalCubedEntityTags.PORTAL_BLACKLIST))
 			return;
 
 		Vec3 oldPos = position();
 		Vec3 newPos = new Vec3(args.get(0), args.get(1), args.get(2));
-		PortalManager manager = PortalManager.of(level());
+		PortalManager manager = PortalManager.of(level);
 		PortalHitResult result = manager.clipPortal(oldPos, newPos);
 		if (result != null) {
 			Vec3 teleported = result.teleportedEnd();
 			args.set(0, teleported.x);
 			args.set(1, teleported.y);
 			args.set(2, teleported.z);
-			System.out.println("entity teleported");
+			System.out.println("entity teleported from " + newPos + " to " + teleported);
 			// TODO: should we teleport the old position fields to behind the out portal?
 		}
 	}