>As you could tell from the title of this post, im having a problem
>with a small 3d program im writting. Whats going on is this :

>I have a small program which rotates a 3d object around the Z axis by
>using the left/right arrow keys. The object is very similar to a chess
>board (made up of a series of squares) The problem that is arising is
>when ANY of the vertices Y values of this object go outside the range
>of -32 to 33 a value of 130 is added (or subtracted) to the Y value of
>the vertice. (If the -32 range is exceeded, 130 is subtracted, else if
>the 33 range is exceeded, 130 is added)

>It has got me stumped as to WHY this is happening. Ive asked several
>friends who are into programming, but the problem has illuded them as
>well.

>If anyone out there has some ideas as to what could be causing this
>problem i'd love to hear from you.

>Thank you :)

>Andrew Burch - (Jesder)

>If anyone out there has some ideas as to what could be causing this
>problem i'd love to hear from you.

> As you could tell from the title of this post, im having a problem
> with a small 3d program im writting. Whats going on is this :

> I have a small program which rotates a 3d object around the Z axis by
> using the left/right arrow keys. The object is very similar to a chess
> board (made up of a series of squares) The problem that is arising is
> when ANY of the vertices Y values of this object go outside the range
> of -32 to 33 a value of 130 is added (or subtracted) to the Y value of
> the vertice. (If the -32 range is exceeded, 130 is subtracted, else if
> the 33 range is exceeded, 130 is added)

> It has got me stumped as to WHY this is happening. Ive asked several
> friends who are into programming, but the problem has illuded them as
> well.

> If anyone out there has some ideas as to what could be causing this
> problem i'd love to hear from you.

>> Hey all!

>> As you could tell from the title of this post, im having a problem
>> with a small 3d program im writting. Whats going on is this :

>> I have a small program which rotates a 3d object around the Z axis by
>> using the left/right arrow keys. The object is very similar to a chess
>> board (made up of a series of squares) The problem that is arising is
>> when ANY of the vertices Y values of this object go outside the range
>> of -32 to 33 a value of 130 is added (or subtracted) to the Y value of
>> the vertice. (If the -32 range is exceeded, 130 is subtracted, else if
>> the 33 range is exceeded, 130 is added)

>> It has got me stumped as to WHY this is happening. Ive asked several
>> friends who are into programming, but the problem has illuded them as
>> well.

>> If anyone out there has some ideas as to what could be causing this
>> problem i'd love to hear from you.

>     If things change by 128 (not 130), it starts to sound like a "signed
>byte" problem.  Is the number being treated as a byte?  Is it considered
>signed?  (Apparently it is, since you mention -32).  If it "wraps" at 32,
>it sounds like only the lower 6 bits are being used (five
>bits of precision and one of sign).

>Bob Schor

>Thank you to the people who took interest and the time to reply to my
>3D problem. I appreciate it! At 1am yesterday morning i actually
>worked out what was going wrong! Becuase i use Longints with my fixed
>point math, i needed to set my X and Y variables to longints as well,
>and not just integer. That was all the problem was (its always the
>smallest of things to cause the biggest problems ;)