# Match camera fov to rectangle

 07 July 2012 jhayez New Member portfolio Jason Hayes San Marcos, USA Match camera fov to rectangle Given a rectangle, how would I match a camera's fov to fit exactly? I'm setting the render width and height to match the size of the rectangle, but the FOV of the camera doesn't match. This needs to be an orthographic projection. Thanks. share quote
 07 July 2012 spacegroo PRO Josh Jones Lead Animator Bethesda Game Studios USA You'll need to use some trig. You'll need to calculate the horizontal angle of the camera based on the rectangle's width and its distance from the camera. I.e. take the Tangent of the (width/2)/distance, since as we remember from high school algebra, tangent is opposite/adjacent. horizontal FOV = 2*tan((rectangle.width*0.5)/camDistance) Note: this is all from memory and untested, so someone please correct me if my math skills are a bit rusty. share quote
 07 July 2012 3ak Know-it-All maybe: horizontal FOV = 2*atan((rectangle.width*0.5)/camDistance) share quote
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