underwater doesn't have base texture

src/material/mod.rs

@@ -88,7 +88,7 @@ impl Material {
             Material::VertexLitGeneric(mat) => &mat.base_texture,
             Material::UnlitGeneric(mat) => &mat.base_texture,
             Material::WorldVertexTransition(mat) => &mat.base_texture,
-            Material::Water(mat) => &mat.base_texture,
+            Material::Water(mat) => mat.base_texture.as_deref().unwrap_or_default(),
             Material::EyeRefract(mat) => &mat.iris,
             _ => "",
         }

src/material/water.rs

@@ -5,8 +5,12 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct WaterMaterial {
     /// Usually referred to as a "sludge-layer", acts as a layer on top of the surface of the $AboveWater Material.
-    #[serde(rename = "$basetexture", deserialize_with = "deserialize_path")]
-    pub base_texture: String,
+    #[serde(
+        rename = "$basetexture",
+        default,
+        deserialize_with = "deserialize_path"
+    )]
+    pub base_texture: Option<String>,
     /// Tells this material is used for models and not brushes.
     #[serde(rename = "$abovewater", default)]
     pub above_water: bool,

tests/snapshots/parse__tests__data__water_murky.vmt.snap

@@ -3,7 +3,7 @@ source: tests/parse.rs
 expression: result
 ---
 water(WaterMaterial(
-  r#$basetexture: "swamp/water/water_murky",
+  r#$basetexture: Some("swamp/water/water_murky"),
   r#$abovewater: true,
   r#$bottommaterial: Some("swamp/water/water_murky_beneath.vmt"),
   r#$underwaterover: None,