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  • vpWindow - multiply the projection matrix by a perspective or orthographic matrix

    #include <volpack.h>
    
           vpResult
           vpWindow(vpc, type, left, right, bottom, top, near, far)
               vpContext *vpc;
    vpWindow is used  to  multiply  the  current  projection  matrix  by  a
           perspective  or  orthographic  projection  matrix.   The new projection
           matrix is defined by the coordinates of six clipping planes in the  eye
           coordinate system (see vpCurrentMatrix(3)).  The matrix maps the points
           (left, bottom, near) and (right, top, near) to the lower left and upper
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