Fix weird interactions between plane and player model

frontend/src/app/particles/services/intersection-plane.service.ts

@@ -46,6 +46,7 @@ export class IntersectionPlaneService {
     // Center the plane vertically with the player (player is about 2 blocks tall)
     this.intersectionPlane.position.y = 1;
     this.rendererService.scene.add(this.intersectionPlane);
+    this.intersectionPlane.renderOrder = 1;
 
     return this.intersectionPlane;
   }

frontend/src/app/particles/services/player-model.service.ts

@@ -55,6 +55,7 @@ export class PlayerModelService {
       this.createSimplePlayerModel();
     }
 
+    this.playerModel.renderOrder = 0;
     this.rendererService.scene.add(this.playerModel);
     return this.playerModel;
   }