c# - How to get an angle between a direction faced and a point in 3D space -


the information have vertical angle of player's vision, horizontal angle point in question, distance point , point's vertical height.

i've figured out how angle if player isn't looking or down (vertical angle) using following.

float getvisionangle(float anglehoriz, float anglevert, float distance, float height) { double = math.cos(anglehoriz * (math.pi / 180)) * distance); double hypotenuse = math.sqrt(distance * distance + height * height); return (float)(math.acos(a / hypotenuse) * (180 / math.pi)); }

original method derive angle between point in space , player's vision direction

what can't figure out how angle if player's vision direction modified vertical angle (looking or down). i've been mulling on in head few days , can't figure out way it.

what i'm using generate vision cone cutoff. when object checked visibility, information have work angle of object player, distance object, , height. initial range check return angle player's direction of vision , determine whether object visible or not.

the walls set transparent show vision range

here shot of code in debug using solution provided @habo unfortunately, results in nan error.

nan seems returned.

converting angles radians before using them seems fix lot of numerical errors. don't understand formula @ end converts previous numbers final angle though. here new set of numbers using easier work figures

ah = angle in horizontal plane between line of sight (los) , object.  (anglehoriz)  av = angle in vertical plane of los.  (anglevert)  d = distance object in horizontal plane.  (distance)  h = height of object above horizontal plane.  (height)  = distance origin object.    = sqrt( d * d + h * h )  oh = horizontal offset los object @ base of wall.    = sin( ah ) * d  dh = horizontal distance origin wall.    = cos( ah ) * d  hlos = height @ los intersects wall.      = tan( av ) * dh  dlos = distance observer los @ wall.      = sqrt( dh * dh + hlos * hlos )  dw = distance along wall between line of sight , object.    = sqrt( oh * oh + ( h - hlos ) * ( h - hlos ) )  answer = acos( ( dlos * dlos + * - dw * dw ) / ( 2 * dlos * ) )

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