adding getHeight function for gerster waves

Assets/Components/GerstnerWavesComponent.re.ts

@@ -203,6 +203,15 @@ export default class GerstnerWavesComponent extends RE.Component {
     this.elapsed += RE.Runtime.deltaTime;
     (this.object3d as any).material.uniforms.clock.value = this.elapsed
   }
+
+  getHeightAt(position: THREE.Vector3) {
+    let height = 0
+    let coords = new THREE.Vector2(position.x, position.z)
+    this.wave.waves.forEach((wave) => {
+        height += this.wave.calcWaveH(wave, coords, this.elapsed)
+    })
+    return height
+    }
 }
 
 RE.registerComponent(GerstnerWavesComponent);
@@ -230,7 +239,7 @@ class GerstnerWave {
   }
 
   calcWaveH( w, coord, time ){
-      const dir = new THREE.Vector2( w.dir ).normalize();
+      const dir = new THREE.Vector2( w.dir[0], w.dir[1] ).normalize();
       const k = 6.283185307179586 / w.wavelen;	                // Phase Increment
       const c = Math.sqrt( 9.8 / k );	                            // Phase Speed. Higher the wave, the faster it moves, Gravity Constant
       const f = k * ( GerstnerWave.dot( dir, coord ) - c * time );        // Frequency - Specific time in Phase : PhaseInc * ( Angle - PhaseSpeed * Time )