Allow user defined directional light cascades.

crates/bevy_pbr/src/light.rs

@@ -252,6 +252,8 @@ pub struct CascadeShadowConfig {
     pub overlap_proportion: f32,
     /// The (positive) distance to the near boundary of the first cascade.
     pub minimum_distance: f32,
+    /// Whether the cascades are user controlled
+    pub manual_cascades: bool,
 }
 
 impl Default for CascadeShadowConfig {
@@ -347,6 +349,7 @@ impl CascadeShadowConfigBuilder {
             ),
             overlap_proportion: self.overlap_proportion,
             minimum_distance: self.minimum_distance,
+            manual_cascades: false,
         }
     }
 }
@@ -384,21 +387,21 @@ impl From<CascadeShadowConfigBuilder> for CascadeShadowConfig {
 #[reflect(Component)]
 pub struct Cascades {
     /// Map from a view to the configuration of each of its [`Cascade`]s.
-    pub(crate) cascades: HashMap<Entity, Vec<Cascade>>,
+    pub cascades: HashMap<Entity, Vec<Cascade>>,
 }
 
 #[derive(Clone, Debug, Default, Reflect, FromReflect)]
 pub struct Cascade {
     /// The transform of the light, i.e. the view to world matrix.
-    pub(crate) view_transform: Mat4,
+    pub view_transform: Mat4,
     /// The orthographic projection for this cascade.
-    pub(crate) projection: Mat4,
+    pub projection: Mat4,
     /// The view-projection matrix for this cascade, converting world space into light clip space.
     /// Importantly, this is derived and stored separately from `view_transform` and `projection` to
     /// ensure shadow stability.
-    pub(crate) view_projection: Mat4,
+    pub view_projection: Mat4,
     /// Size of each shadow map texel in world units.
-    pub(crate) texel_size: f32,
+    pub texel_size: f32,
 }
 
 pub fn update_directional_light_cascades(
@@ -423,7 +426,7 @@ pub fn update_directional_light_cascades(
         .collect::<Vec<_>>();
 
     for (transform, directional_light, cascades_config, mut cascades) in lights.iter_mut() {
-        if !directional_light.shadows_enabled {
+        if !directional_light.shadows_enabled || cascades_config.manual_cascades {
             continue;
         }