Add Eq implementations for Plane and basic derives for PlaneIntersection

csg/src/plane.rs

@@ -22,6 +22,18 @@ impl Plane {
     }
 }
 
+impl PartialEq for Plane {
+    fn eq(&self, other: &Self) -> bool {
+        (self.normal.x - other.normal.x).abs() < math::EPSILON
+            && (self.normal.y - other.normal.y).abs() < math::EPSILON
+            && (self.normal.z - other.normal.z).abs() < math::EPSILON
+            && (self.offset - other.offset).abs() < math::EPSILON
+    }
+}
+
+impl Eq for Plane {}
+
+#[derive(Clone, Copy, Debug)]
 pub struct PlaneIntersection {
     pub planes: [Plane; 3],
 }