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Thread: How to control size of unit?

  1. #1

    How to control size of unit?


    I'm strugling from calculating exact size of
    each unit in a world coordinates.
    I have to maintain small size of unit in
    order to draw an object and large size to
    draw background image.
    Usually, small size fits to meters and large
    size to kilometers.
    And also I'd like to calculate how large
    a pixel takes.

    Please, anybody help me !!!
    (Refer to Developer's FAQ 9.010)

  2. #2
    Senior Member OpenGL Guru zed's Avatar
    Join Date
    Nov 2010

    Re: How to control size of unit?

    numpixels = boundingSphereRadius / zDistance;
    numpixels *= numpixels;
    numpixels *= (screenHeight * screenWidth);

    this'll give u an approximation
    boundingSphereRadius & zDistance refer to the object u wanna test

  3. #3

    Re: How to control size of unit?

    Thanks, ZED !

    The information you posted helps me a lot,
    however, I want to get a piece of code that
    shows how to control size of unit.
    Would you ?

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