[A83] Re: Faster Multiplication

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: Faster Multiplication
From: Gavin Olson <gtolson@snet.net>
Date: Fri, 01 Jun 2001 15:06:09 -0400
In-Reply-To: <Pine.SOL.4.33.0105311554460.3710-100000@apocalypse.OCF.Ber keley.EDU>
References: <GNEPLIJKKPFKKJNDKHEKCEHFCBAA.kirkmeyer@bigfoot.com>
Reply-To: assembly-83@lists.ticalc.org


>> Rotating in that manner is not feasible for 3D programs. Your rotation math
>> is not accurate enough and after a while the numbers will degenerate and
>> make the picture look funny. You have to store the X Y and Z rotation for
>> all objects and rotate them those amounts each frame.

If you overwrite your original coordinates, yes, those ormulas will drift
all of the values twords 0 (on the 8086 floating-points system, I haven't
tried it on a TI) If, however, you perform the rotation and store the
values as rotated points, overwriting these rotated points with rotations
on the original values, then there is no problem.

Follow-Ups:

[A83] Re: Faster Multiplication

From: "Kirk Meyer" <kirkmeyer@bigfoot.com>

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