Message-ID:	<007c01bdfa2c$81be9da0$827d14cb@dragon>
From:	"James Takac" <pdragon AT jtn DOT net DOT au>
To:	<djgpp AT delorie DOT com>
Subject:	Re: 3d sphere
Date:	Sun, 18 Oct 1998 10:10:43 +1000
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Reply-To:	djgpp AT delorie DOT com

actually you only need to calculate 1/8th of the circle and plot both
positive and negative values of the coords
-----Original Message-----
From: Arthur <arfa AT clara DOT net>
To: djgpp AT delorie DOT com <djgpp AT delorie DOT com>
Date: Sunday, October 18, 1998 5:28 AM
Subject: RE: 3d sphere


>> If you are not speed dependen, make two loops:
>> loop b=0° to 180°
>>  loop a=0° to 180°
>>   ribbon=cos(b)
>>   offset in ribbon=cos(a)
>>   screenpos= (a,b)
>>
>> offcourse you have to multiply a and b with different konstants,
>> bependin on how many ribbons you have, how big they are and the size of
>> the sphere on screen.
>>
>> cos(a) and cos(b) witt ossilate between -1 and 1 so if you want a screen
>> x-size of 100, make screen_x=cos(a)*50+50;
>>
>> Hop it helped(and hope it works, BTW, ordinary sin() and cos() works
>> with radians, radians=degrees*pi/180 so use sin(a*3.1415/180) etc).
>
>Remember that for a circle, you only need to calculate one quarter of it,
>since the other four quarters are simply mirror images of the first quater.
>
>James Arthur
>jaa AT arfa DOT clara DOT net
>ICQ#15054819
>

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