Fix Age celestial path rotation

docs/PORTING.md

@@ -360,6 +360,10 @@ sky. The sun, moon, and stars follow a plane rotated by the saved Legacy-style
 angle in normal gameplay and Immersive Portals previews, while vanilla
 dimensions retain their standard celestial path.
 
+Version 0.2.26.1 rotates the celestial path around the world's vertical axis,
+allowing the saved angle to change each Age's sunrise and sunset compass
+direction instead of merely tilting the rendered path.
+
 Version 0.2.14.0 restores the legacy Linking and Descriptive Book artwork for
 inventory items and gives each book its matching open-book texture when placed
 on a Book Stand. Return Linking Books created inside another Age also retain and

gradle.properties

@@ -35,7 +35,7 @@ mod_name=Rivencraft
 # The license of the mod. Review your options at https://choosealicense.com/. All Rights Reserved is the default.
 mod_license=LGPL-3.0-or-later
 # The mod version. Rivencraft uses the x.y.z.b policy documented in README.md.
-mod_version=0.2.26.0
+mod_version=0.2.26.1
 immersive_portals_version=6.0.7
 # The group ID for the mod. It is only important when publishing as an artifact to a Maven repository.
 # This should match the base package used for the mod sources.

src/main/java/net/dnorberg/rivencraft/mixin/client/LevelRendererMixin.java

@@ -10,7 +10,7 @@ import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Redirect;
 
-/** Tilts the vanilla sun, moon, and star plane by each Age's saved angle. */
+/** Rotates the vanilla sun, moon, and star path by each Age's saved angle. */
 @Mixin(LevelRenderer.class)
 public abstract class LevelRendererMixin {
     @Shadow
@@ -26,6 +26,10 @@ public abstract class LevelRendererMixin {
     )
     private Quaternionf rivencraft$rotateCelestialPlane(Axis axis, float degrees) {
         float angle = ClientAgeCelestialAngles.get(level.dimension());
-        return new Quaternionf(Axis.ZP.rotationDegrees(angle)).mul(axis.rotationDegrees(degrees));
+        // Vanilla's -90 degree Y rotation fixes every sunrise to the same
+        // east/west line. Offset that rotation around the world's vertical
+        // axis so the saved Age angle changes the compass direction of the
+        // entire sun, moon, and star path.
+        return axis.rotationDegrees(degrees + angle);
     }
 }