one of polygons disappear

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Jim (jim++at++systech.hinet.net)
Wed, 15 Jan 1997 21:13:18 -0800

Hi Performer:

        I construct a cone which composed of ten-triangles. The pfGSet vertices
coord.s of triagles like
             [ x+R*sin(n*pi/5) ,y+R*cos(n*pi/5) , z]
            [ x ,y , z-length]
            [ x+R*sin((n+1)*pi/5), y+R*cos((n+1)*pi/5), z]

        n ----- 0<n<9
        R ----- the radius of circle
        (x, y, z)----- the center of circle
        pi=3.14159

        It looks right with ten triangls in wireframe pfGStateMode, but seems
(the last) one of triangles just disappear in other NONwireframe mode.

        I have ever tied the set PFCULLFACE ON/OFF and set n=-1 for the last
vertice(n=9) also. But it still can not be visible. I tried with BACKFACE
showing and didn't see the lost.

        Please help me! Thanks.

-- 
Jim Tsai     			                
Software Engineer       Visual Simulation sec.  
System & Technology Corp.    Taipei           


Email  : jim++at++systech.hinet.net   Tel: 886-2-6981599   Fax: 886-2-6981211
Address: 18F-5, No. 79, Hsin Tai Wu Road, Sec. 1, Hsi-chih, Taipei Hsien, Taiwan, R.O.C.




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