feat: terrain

app/player.ts

@@ -1,3 +1,4 @@
+import { Terrain } from "../engine/scene/Terrain"
 import type { Vec3 } from "../engine/math/Vec3"
 import type { Aabb, Level } from "./level"
 
@@ -82,7 +83,7 @@ export namespace Player {
   }
 
   function groundHeight(position: Vec3, level: Level): number {
-    let ground = 0
+    let ground = Terrain.height(level.terrain, position.x, position.z)
     for (const aabb of level.colliders) {
       if (
         aabb.standable &&