rtiow/vec3: add min/max functions for building new Vec3 from 2 others.

rtiow/vec3/src/vec3.rs

@@ -15,6 +15,23 @@ pub struct Vec3 {
     pub z: f32,
 }
 
+// Return a `Vec3` with the lowest of each component in v1 or v2.
+pub fn min(v1: Vec3, v2: Vec3) -> Vec3 {
+    Vec3 {
+        x: v1.x.min(v2.x),
+        y: v1.y.min(v2.y),
+        z: v1.z.min(v2.z),
+    }
+}
+// Return a `Vec3` with the greatest of each component in v1 or v2.
+pub fn max(v1: Vec3, v2: Vec3) -> Vec3 {
+    Vec3 {
+        x: v1.x.max(v2.x),
+        y: v1.y.max(v2.y),
+        z: v1.z.max(v2.z),
+    }
+}
+
 pub fn cross(v1: Vec3, v2: Vec3) -> Vec3 {
     Vec3 {
         x: v1.y * v2.z - v1.z * v2.y,