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000466_owner-lightwave-l _Fri Feb 24 17:30:08 1995.msg
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Date: Fri, 24 Feb 1995 15:57:33 -0700 (MST)
From: Ernie Wright <ernie@gaspra.pd.com>
To: lightwave-l@netcom.com
Subject: Re: LW4.0 and physics , an open letter to NewTek
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Precedence: bulk
Ole Andre Schistad wrote a long message that, leaving aside the physics
lesson, boiled down to these suggestions for LW:
1. "forward" kinematics
2. collision detection
Both of these are well-understood animation tools and are being developed
for LW by third parties. Programmers can find public code for polyhedral
center-of-mass and collision in the Graphics Gems series by Academic Press.
But the real-world effects Ole is looking for can't be captured by simple
kinematics. Friction plays a large role in the smallest things, like the
sudden change in rotation of a thrown die as it bounces. Naturalistic
motion paths can be calculated as an energy minimization (Luxo Jr.), but
it's extremely compute-intensive and a lot more complicated than f = ma.
In any case, to put Ole at ease, Yes, we've heard of physics, people know
it can be applied to animation, and lots of folks are working on it.
- Ernie