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Thread: Using gluUnProject

  1. #1
    Intern Contributor
    Join Date
    Feb 2000

    Using gluUnProject

    I *really* can't find any way out of the gluUnProject function.
    What's supposed to be? When is it used?
    How is formed the matrix passed in the args?
    Paolo M.

  2. #2
    Super Moderator OpenGL Guru
    Join Date
    Feb 2000
    Montreal, Canada

    Re: Using gluUnProject

    gluUnProject is used to convert from windows coordinate to object coordinate:

    example, a pixel's position might be (1, 1)

    if that pixel represents a rendered point in 3D space, what were it's original (x, y, z) values? Solution: gluUnProject() with 1, 1 and you must provide the depth value.

    You can use it for tests for one thing. If you don't need it, why worry about it?
    an open source GLU replacement library. Much more modern than GLU.
    float matrix[16], inverse_matrix[16];
    glhTranslatef2(matrix, 0.0, 0.0, 5.0);
    glhRotateAboutXf2(matrix, angleInRadians);
    glhScalef2(matrix, 1.0, 1.0, -1.0);
    glhQuickInvertMatrixf2(matrix, inverse_matrix);
    glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
    glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

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