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Thread: Perspective issues

  1. #1
    Junior Member Newbie
    Join Date
    Jul 2005
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    italy
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    Perspective issues

    Using perspective projection the farther an object is from the eye, the smaller it appears in the result image.
    This relation between distance from the eye and dimension seems to be nonlinear, this amount of nonlinearity depends from glFrustrum parameters?How can I compute this relation?
    Visual Basic 6.0 must die

  2. #2
    Senior Member Frequent Contributor
    Join Date
    May 2006
    Posts
    701

    Re: Perspective issues

    With perspective projection the projected size of an object in each dimension is inversely proportional to the distance.

    In other words, a 1x1 square at distance 1 and a 4x4 square at distance 4 project to an equal area.
    Georg Kolling, Imagination Technologies
    Please ask questions specific to PowerVR hardware or SDKs on the PowerVR Insider Forum
    DevTech@imgtec.com | http://www.powervrinsider.com

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