Upgrade Ground Zero terrain material

Scripts/verify_ground_zero_natural_environment_pass.py

@@ -82,6 +82,28 @@ def assert_asset(path):
     return asset
 
 
+def verify_terrain_material_is_not_flat(material, failures):
+    project_root = unreal.Paths.convert_relative_path_to_full(unreal.Paths.project_dir())
+    material_package = project_root + "Content/Agrarian/Materials/M_AGR_GZ_Terrain_CoastalScrub.uasset"
+    try:
+        with open(material_package, "rb") as handle:
+            package_bytes = handle.read()
+    except Exception as exc:
+        failures.append(f"could not inspect terrain material package: {exc}")
+        return
+
+    noise_count = package_bytes.count(b"MaterialExpressionNoise")
+    lerp_count = package_bytes.count(b"MaterialExpressionLinearInterpolate")
+    color_count = package_bytes.count(b"MaterialExpressionConstant3Vector")
+
+    if noise_count < 1:
+        failures.append("terrain material should include a noise expression for color breakup")
+    if lerp_count < 1:
+        failures.append("terrain material should include a blend expression instead of a flat base color")
+    if color_count < 1:
+        failures.append("terrain material should include coastal scrub color vector expressions")
+
+
 def main():
     if not unreal.EditorLevelLibrary.load_level(MAP_PATH):
         raise RuntimeError(f"Could not load map: {MAP_PATH}")
@@ -98,6 +120,7 @@ def main():
         expected = MATERIALS["terrain"]
         if assigned != expected:
             failures.append(f"landscape material expected {expected}, got {assigned}")
+    verify_terrain_material_is_not_flat(materials["terrain"], failures)
 
     foliage_actors = [actor for actor in actors if get_actor_label(actor) == FOLIAGE_LABEL]
     if len(foliage_actors) != 1:
@@ -187,8 +210,10 @@ def main():
     roadmap = unreal.Paths.convert_relative_path_to_full(unreal.Paths.project_dir()) + "AGRARIAN_DEVELOPMENT_ROADMAP.md"
     for path, snippet in [
         (docs, "asset variation"),
+        (docs, "procedural coastal scrub terrain material"),
         (roadmap, "[x] Replace grey-box environment presentation with an MVP natural environment pass"),
         (roadmap, "[x] Add first-pass environment asset variation"),
+        (roadmap, "[x] Replace or upgrade the terrain material first so Ground Zero no longer reads as flat tan placeholder ground."),
     ]:
         with open(path, "r", encoding="utf-8") as handle:
             text = handle.read()