Implement cross product

src/main/kotlin/math/Vector.kt

@@ -4,7 +4,7 @@ import kotlin.math.sqrt
 
 data class Vector(val x: Float, val y: Float, val z: Float) {
     val length: Float get() = sqrt(squaredLength)
-    val squaredLength: Float get() = x * x + y * y + z * z
+    val squaredLength: Float get() = this dot this
 
     fun normalized(): Vector = this / length
 
@@ -14,6 +14,12 @@ data class Vector(val x: Float, val y: Float, val z: Float) {
     operator fun minus(rhs: Vector): Vector = Vector(x - rhs.x, y - rhs.y, z - rhs.z)
     operator fun div(rhs: Float): Vector = Vector(x / rhs, y / rhs, z / rhs)
 
+    operator fun times(rhs: Vector): Vector = Vector(
+        y * rhs.z - z * rhs.y,
+        z * rhs.x - x * rhs.z,
+        x * rhs.y - y * rhs.x
+    )
+
     infix fun dot(rhs: Vector): Float = x * rhs.x + y * rhs.y + z * rhs.z
 }