camera fluid check never loads the chunk at the eye (an eye in an unloaded chunk loaded it synchronously in prepare: 204 ms, now 13 ms)

src/main/java/eu/mhsl/minecraft/pixelpics/render/render/DefaultScreenRenderer.java

@@ -39,7 +39,9 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 import java.util.stream.IntStream;
 import org.bukkit.Location;
+import org.bukkit.Material;
 import org.bukkit.World;
+import org.bukkit.block.data.BlockData;
 import org.bukkit.entity.Entity;
 import org.bukkit.util.Vector;
 
@@ -167,8 +169,15 @@ public class DefaultScreenRenderer {
         return SnapshotBuilder.chunkArea(eyeLocation, FrustumBounds.of(eyeLocation, rayMap, MAX_DISTANCE), 2);
     }
 
+    /** The fluid at the eye; an unloaded chunk counts as air (never loads one, see {@link SnapshotBuilder}). */
     private static int cameraFluid(Location eye) {
-        return FluidRenderer.cameraFluid(eye.getWorld()::getBlockData, eye.getX(), eye.getY(), eye.getZ());
+        World world = eye.getWorld();
+        BlockData air = Material.AIR.createBlockData();
+        return FluidRenderer.cameraFluid(
+                (x, y, z) -> world.isChunkLoaded(x >> 4, z >> 4) ? world.getBlockData(x, y, z) : air,
+                eye.getX(),
+                eye.getY(),
+                eye.getZ());
     }
 
     private static RayMap rayMap(Location eye, int width, int height, int cameraFluid) {