modify chunk border debug rendering to render around the freecam position if enabled

Author: beanbag44

src/main/java/com/lambda/mixin/render/ChunkBorderDebugRendererMixin.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2026 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda.mixin.render;
+
+import com.lambda.Lambda;
+import com.lambda.module.modules.render.Freecam;
+import com.llamalad7.mixinextras.injector.ModifyExpressionValue;
+import net.minecraft.client.render.debug.ChunkBorderDebugRenderer;
+import net.minecraft.util.math.ChunkSectionPos;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(ChunkBorderDebugRenderer.class)
+public class ChunkBorderDebugRendererMixin {
+    @ModifyExpressionValue(method = "render", at = @At(value = "INVOKE", target = "Lnet/minecraft/util/math/ChunkSectionPos;from(Lnet/minecraft/util/math/BlockPos;)Lnet/minecraft/util/math/ChunkSectionPos;"))
+    private ChunkSectionPos modifyChunkSectionPos(ChunkSectionPos original) {
+        if (Freecam.INSTANCE.isDisabled()) return original;
+        var camera = Lambda.getMc().gameRenderer.getCamera();
+        return ChunkSectionPos.from(camera.getBlockPos());
+    }
+}

src/main/kotlin/com/lambda/module/modules/render/Freecam.kt

@@ -230,6 +230,14 @@ object Freecam : Module(
 		}
 	}
 
+	private fun SafeContext.findFollowTarget(): PlayerEntity? {
+		if (player.gameMode != GameMode.SPECTATOR) {
+			return player
+		}
+		val players = world.players.filter { it !is ClientPlayerEntity }
+		return players.minByOrNull { it.eyePos.squaredDistanceTo(position) }
+	}
+
 	private enum class FreecamRotationMode(override val displayName: String, override val description: String) : NamedEnum, Describable {
 		None("None", "No rotation changes"),
 		LookAtTarget("Look At Target", "Look at the block or entity under your crosshair"),
@@ -240,12 +248,4 @@ object Freecam : Module(
 		Free("Free", "Move the camera freely with keyboard input"),
 		FollowPlayer("Follow Player", "Camera follows a player as if attached by an invisible string");
 	}
-
-	private fun SafeContext.findFollowTarget(): PlayerEntity? {
-		if (player.gameMode != GameMode.SPECTATOR) {
-			return player
-		}
-		val players = world.players.filter { it !is ClientPlayerEntity }
-		return players.minByOrNull { it.eyePos.squaredDistanceTo(position) }
-	}
 }

src/main/resources/lambda.mixins.json

@@ -7,8 +7,8 @@
     "CrashReportMixin",
     "MinecraftClientMixin",
     "baritone.BaritonePlayerContextMixin",
-    "baritone.LookBehaviourMixin",
     "baritone.ComeCommandMixin",
+    "baritone.LookBehaviourMixin",
     "client.sound.SoundSystemMixin",
     "entity.ClientPlayerEntityMixin",
     "entity.ClientPlayInteractionManagerMixin",
@@ -41,6 +41,7 @@
     "render.ChatHudMixin",
     "render.ChatInputSuggestorMixin",
     "render.ChatScreenMixin",
+    "render.ChunkBorderDebugRendererMixin",
     "render.ChunkOcclusionDataBuilderMixin",
     "render.DrawContextMixin",
     "render.ElytraFeatureRendererMixin",