From b6b42324990305ea80d494f378ba55f931df0420 Mon Sep 17 00:00:00 2001
From: Victor Giers <mail@victorgiers.com>
Date: Sat, 2 May 2026 10:49:30 +0200
Subject: [PATCH] Add validation for foliage quality settings in world document

---
 src/document/scene-document-validation.ts | 61 +++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/src/document/scene-document-validation.ts b/src/document/scene-document-validation.ts
index dc676f58..867e8b9f 100644
--- a/src/document/scene-document-validation.ts
+++ b/src/document/scene-document-validation.ts
@@ -87,6 +87,11 @@ import {
   isAdvancedRenderingShadowType,
   isBoxVolumeRenderPath,
   isAdvancedRenderingToneMappingMode,
+  isFoliageQualityShadowMode,
+  MIN_FOLIAGE_QUALITY_DENSITY_MULTIPLIER,
+  MAX_FOLIAGE_QUALITY_DENSITY_MULTIPLIER,
+  MIN_FOLIAGE_QUALITY_MAX_DISTANCE_MULTIPLIER,
+  MAX_FOLIAGE_QUALITY_MAX_DISTANCE_MULTIPLIER,
   isHexColorString,
   isWorldShaderSkyPresetId,
   type WorldCelestialOrbitAuthoringSettings,
@@ -1360,6 +1365,62 @@ function validateWorldSettings(
     );
   }
 
+  if (!isBoolean(advancedRendering.foliage.enabled)) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-foliage-quality-enabled",
+        "Foliage quality enabled must be a boolean.",
+        "world.advancedRendering.foliage.enabled"
+      )
+    );
+  }
+
+  if (
+    !isFiniteNumberInRange(
+      advancedRendering.foliage.densityMultiplier,
+      MIN_FOLIAGE_QUALITY_DENSITY_MULTIPLIER,
+      MAX_FOLIAGE_QUALITY_DENSITY_MULTIPLIER
+    )
+  ) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-foliage-quality-density-multiplier",
+        "Foliage density multiplier must be a finite number between 0 and 2.",
+        "world.advancedRendering.foliage.densityMultiplier"
+      )
+    );
+  }
+
+  if (
+    !isFiniteNumberInRange(
+      advancedRendering.foliage.maxDistanceMultiplier,
+      MIN_FOLIAGE_QUALITY_MAX_DISTANCE_MULTIPLIER,
+      MAX_FOLIAGE_QUALITY_MAX_DISTANCE_MULTIPLIER
+    )
+  ) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-foliage-quality-max-distance-multiplier",
+        "Foliage max distance multiplier must be a finite number between 0.1 and 2.",
+        "world.advancedRendering.foliage.maxDistanceMultiplier"
+      )
+    );
+  }
+
+  if (!isFoliageQualityShadowMode(advancedRendering.foliage.shadows)) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-foliage-quality-shadows",
+        "Foliage shadows must be off, near, or full.",
+        "world.advancedRendering.foliage.shadows"
+      )
+    );
+  }
+
   if (!isBoxVolumeRenderPath(advancedRendering.fogPath)) {
     diagnostics.push(
       createDiagnostic(