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vcGamer

difference between aspect ratio & FOV

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hi I want to know the exact and technical difference between FOV and aspect ratio, which both are parameters of the projection tranformation, I've achieved almost the same result as increasing FOV by increasing the ratio of course much less distortion problems, what's going here? thanks www.galaxyroad.com PowerX

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FOV = vision angle for a perspective projection
aspect ratio = (width of the viewport) / (height of the viewport)

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Hi there vcGamer,
How are you doing?

[Aspect Ratio]
"Aspect ratio describes the width and height proportion of the display. Standard TV and computer monitor displays have an aspect ratio of 4:3 (meaning for every 4 pixels running along the width of the frame buffer there are 3 pixels along the height, sometimes also represented simply as 1.33)."

[Field of View]
"(FOV) the angle of the cone of vision of a lens; the usual human FOV is approximately 150°"
"The viewing frustum is defined by fov (field of view) and by the distances of the front and back clipping planes, specified in z-coordinates."


I hope this helps.

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FOV controls the the VERTICAL angle of view. Aspect is the ratio of the horizontal viewing area, compared to the vertical viewing area. It can often be set to viewport.width / viewport.height, but not always. For example, using a standard 4:3 TV resolution of 640x480, but displaying on a widescreen monitor, or widescreen TV, specifying 640/480.0f is going to be distorted. Both the viewport and the expected display need to be taken into account.

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