MONKEY (gfx): keep named rock doodads and ground clutter rigid in wind

Reject rock, stone, boulder, pebble, gravel and rubble model filenames from retained foliage. Give matching ground-detail models zero bend height so neither grass wind nor player parting moves them. Limit the name veto to the filename to preserve vegetation in stone-named zones.

Verified on Windows: two foliage classifier tests and one rigid-model test pass; benilla-app lib tests have 4313 passed, 0 failed, 10 ignored (no-install run); play build passes. Elwynn wind captures at 0 and 3 seconds preserve coloured foliage motion. The tester's specific small-rock assets still need an in-game retest.

Co-Authored-By: GPT-6 Astra (Codex)

crates/benilla-world/src/clutter.rs

@@ -334,6 +334,9 @@ fn build_chunk_clutter(
                 (lo.min(p[2]), hi.max(p[2]))
             });
         let height_span = (max_z - min_z).max(1.0e-4);
+        // MONKEY (wind): the detail table includes stones as well as grass. Zero bend weight
+        // keeps their geometry fixed under both wind and the player-parting field.
+        let bends = !crate::wind::rigid_model(model_path);
         for sub in subs.iter() {
             let vcount = sub.positions.len() * placements.len();
             let mut positions = Vec::with_capacity(vcount);
@@ -359,7 +362,12 @@ fn build_chunk_clutter(
                 for (i, p) in sub.positions.iter().enumerate() {
                     positions.push((rot * (wow_to_bevy(*p) * inst_scale) + origin).to_array());
                     uvs.push(sub.uvs[i]);
-                    wind.push([((p[2] - min_z) / height_span).clamp(0.0, 1.0), phase]);
+                    let bend_height = if bends {
+                        ((p[2] - min_z) / height_span).clamp(0.0, 1.0)
+                    } else {
+                        0.0
+                    };
+                    wind.push([bend_height, phase]);
                     normals.push(sp.ground_normal);
                     colors.push(tint);
                 }

crates/benilla-world/src/static_gx/mod.rs

@@ -700,11 +700,11 @@ impl StaticGx {
     }
 }
 
-/// MONKEY (wind): conservative leaf classification. Alpha test excludes trunks/rocks even when a
-/// whole model path says tree; the name terms cover vanilla's tree/bush/plant families. Animated
+/// MONKEY (wind): conservative leaf classification. Alpha test alone does not exclude rock cards;
+/// rigid model names veto plant-family directories. Animated
 /// doodads never reach this function because `assemble.rs` excludes them before `StaticGx::divert`.
 pub(crate) fn foliage_wind_batch(path: &str, blend: ModelBlend, wmo_geometry: bool) -> bool {
-    if wmo_geometry || blend != ModelBlend::AlphaTest {
+    if wmo_geometry || blend != ModelBlend::AlphaTest || crate::wind::rigid_model(path) {
         return false;
     }
     let p = path.to_ascii_lowercase();
@@ -920,6 +920,23 @@ mod tests {
         ));
     }
 
+    #[test]
+    fn foliage_classifier_vetoes_rigid_cards_in_plant_families() {
+        for path in [
+            "World\\Generic\\PassiveDoodads\\Bush\\BushRock01.m2",
+            "World\\Azeroth\\Elwynn\\PassiveDoodads\\Trees\\Stone01.m2",
+            "World/Generic/Foliage/Boulder01.m2",
+            "World/Generic/Plants/Pebble01.m2",
+            "World/Generic/Foliage/Gravel01.m2",
+            "World/Generic/Foliage/Rubble01.m2",
+        ] {
+            assert!(
+                !foliage_wind_batch(path, ModelBlend::AlphaTest, false),
+                "{path}"
+            );
+        }
+    }
+
     #[test]
     fn a_fader_divert_registers_its_placement_seed() {
         let mut gx = StaticGx::default();

crates/benilla-world/src/wind/mod.rs

@@ -15,6 +15,19 @@ const TAU: f64 = std::f64::consts::TAU;
 const RATIOS: [f64; 3] = [1.0, 0.437, 0.1913];
 const WEIGHTS: [f64; 3] = [0.60, 0.28, 0.12];
 
+/// MONKEY (wind): rigid detail models can have alpha-tested cards and live in plant directories.
+/// Inspect the filename so a zone such as Stonetalon does not disable all its vegetation.
+pub(crate) fn rigid_model(path: &str) -> bool {
+    let name = path
+        .rsplit(['/', '\\'])
+        .next()
+        .unwrap_or(path)
+        .to_ascii_lowercase();
+    ["rock", "stone", "boulder", "pebble", "gravel", "rubble"]
+        .iter()
+        .any(|term| name.contains(term))
+}
+
 /// The WarcraftXL wind profile. Units are yards, seconds and degrees.
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct WindProfile {
@@ -352,6 +365,22 @@ impl Plugin for WindPlugin {
 mod tests {
     use super::*;
 
+    #[test]
+    fn rigid_details_ignore_case_and_plant_directory_names() {
+        for path in [
+            "World/Plants/BushRock01.m2",
+            "World\\Trees\\STONE01.mdx",
+            "Boulder02.m2",
+            "Pebble01.m2",
+            "Gravel01.m2",
+            "Rubble01.m2",
+        ] {
+            assert!(rigid_model(path), "{path}");
+        }
+        assert!(!rigid_model("World/Stonetalon/Trees/Pine01.m2"));
+        assert!(!rigid_model("World/RockyZone/Grass01.m2"));
+    }
+
     #[test]
     fn defaults_are_the_warcraft_xl_profile() {
         let p = WindProfile::default();