start working on level editing with raycasting

src/editor/level_editor.jai

@@ -217,6 +217,8 @@ add_trile :: (name: string, x: float, y: float, z: float) {
 
 tick_level_editor :: () {
 	tick_level_editor_camera();
+	ray := get_mouse_ray(*get_level_editor_camera());
+	print("Collison point %\n", ray_plane_collision_point(ray, 0));
 }
 
 draw_level_editor :: () {

src/ray.jai

@@ -40,6 +40,18 @@ Ray_Collision :: struct {
     normal   : Vector3;
 }
 
+// At which 2D XZ point does a ray hit the ground plane at a height of
+// plane_height. Used for the level editor and maybe later the trile editor as well.
+ray_plane_collision_point :: (ray: Ray, plane_height: float) -> Vector2 {
+    // @ToDo: This is stupid, but I don't feel like bothering to do this correctly right now...
+    collision_cube : Collision_Cube = .{
+        .{-100000, plane_height, -100000},
+        .{100000, plane_height + 0.001, 100000}  
+    };
+    collision := does_ray_hit_cube(ray, collision_cube);
+    return .{collision.point.x, collision.point.z};
+}
+
 // Ported over from Raylib.
 does_ray_hit_cube :: (og_ray: Ray, cube: Collision_Cube) -> Ray_Collision {
     ray := og_ray;