Threejs Ennemy vision detection

Here is the article 11 about my series of posts about the game creation.

If you missed it, check out the previous part.

Video presentation

Here is a youtube presentation of the state of the project right now:

Ennemy vision animation

The ennemy path animation is made up by a few vertices starting from the player position to the vision direction.





A collision is made between those vertices and the environment. The vertices are then moved to the collision point, if any.





The part of the code:

collision_with_player=false; // Loop on each vertices of the vision geometry for (var vertexIndex = 1; vertexIndex < this.vision.geometry.vertices.length; vertexIndex++) { var localVertex = this.vision.geometry.vertices[vertexIndex].clone(); var globalVertex = localVertex.applyMatrix4( this.vision.matrix ); var directionVector = globalVertex.sub( this.vision.position ); var ray = new THREE.Raycaster( originPoint, directionVector.clone().normalize(),0, this.vision_distance); var collisionResults = ray.intersectObjects(obstacles); // In each update frame, we start by restoring the vision vertices values this.vision.geometry.vertices[vertexIndex].x = this.vision_orig_vertices[vertexIndex].x; this.vision.geometry.vertices[vertexIndex].y = this.vision_orig_vertices[vertexIndex].y; this.vision.geometry.vertices[vertexIndex].z = this.vision_orig_vertices[vertexIndex].z; this.vision.geometry.verticesNeedUpdate=true; // If the ennemy vision has a collision with "something" if ( collisionResults.length > 0 && collisionResults[0].distance < this.vision_distance) { // If the collision is with a wall, update the vertice position if(collisionResults[0].object.name=='walls') { var distance = collisionResults[0].distance; this.vision.geometry.vertices[vertexIndex].x *= distance / this.vision_distance; this.vision.geometry.vertices[vertexIndex].y *= distance / this.vision_distance; this.vision.geometry.vertices[vertexIndex].z *= distance / this.vision_distance; } // If the collision if with the player, if(collisionResults[0].object.name=='p') { collision_with_player=true; } } } // If there is a collision with the player, the character should run do the player position if(collision_with_player) { this.run(); }

You can get: the source code or View the demo directly.