Line of Sight calculations, anybody done those?

[willemmulder]

For a game, I need many AI units to calculate whether they 'see' each other or not. 

After some googling, I think I might have to go with raycasting and do something like this: http://www.redblobgames.com/articles/visibility/ (great demo BTW!) or even simply cast a ray from every unit to every other unit and check if there's nothing in-between..?

Has somebody already done something similar for babylonjs? Or should I work with a light, let Babylonjs calculate it's shadowmap or something like that?

[Temechon]

It would be easier to work with raycast. It's very easy to do it wih Babylon (of course  )

Just create a Ray: http://doc.babylonjs.com/classes/2.2/Ray
and use the method scene.pickWithRay : http://doc.babylonjs.com/classes/2.2/Scene#pickwithray-ray-predicate-fastcheck-rarr-pickinginfo-classes-2-2-pickinginfo-

You can find some examples here: http://doc.babylonjs.com/playground?q=pickwithray

[willemmulder]

Thanks, that worked!

One small additional question: is there an option to do raycasting and get every colliding object on that ray, so not just only the closest one?

[Temechon]

I dont think it exists as is... A simple way to do this would be to cast the ray each time an object is found, while an obstacle is found.