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Asked: 2026-05-10T18:43:53+00:00

I have an object, that is facing a particular direction with (for instance) a

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I have an object, that is facing a particular direction with (for instance) a 45 degree field of view, and a limit view range. I have done all the initial checks (Quadtree node, and distance), but now I need to check if a particular object is within that view cone, (In this case to decide only to follow that object if we can see it).

Apart from casting a ray for each degree from Direction - (FieldOfView / 2) to Direction + (FieldOfView / 2) (I am doing that at the moment and it is horrible), what is the best way to do this visibility check?

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1 Answer

  1. Compute the angle between your view direction (understood as a vector) and the vector that starts at you and ends at the object. If it falls under FieldOfView/2, you can view the object.

    That angle is: 

    arccos(scalarProduct(viewDirection, (object - you)) / (norm(viewDirection)*norm(object - you))).
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