Make sampling methods public

These are needed publicly in order to enable custom closure behaviour.
swiftcoder · lwansbrough · Oct 30, 2020 · Oct 30, 2020 · Oct 30, 2020 · Oct 30, 2020
commit df035195e60c57b68c36c865ab7ea48d61584b48
diff --git a/src/source.rs b/src/source.rs
@@ -53,13 +53,13 @@ impl<S: Source> CentralDifference<S> {
 }
 
 impl<S: Source> Source for CentralDifference<S> {
-    fn sample(&self, x: f32, y: f32, z: f32) -> f32 {
+    pub fn sample(&self, x: f32, y: f32, z: f32) -> f32 {
         self.source.sample(x, y, z)
     }
 }
 
 impl<S: Source> HermiteSource for CentralDifference<S> {
-    fn sample_normal(&self, x: f32, y: f32, z: f32) -> Vec3 {
+    pub fn sample_normal(&self, x: f32, y: f32, z: f32) -> Vec3 {
         let v = self.sample(x, y, z);
         let vx = self.sample(x + self.epsilon, y, z);
         let vy = self.sample(x, y + self.epsilon, z);