can't we just stop the axes from moving?

RolandofGilead · 2002-09-30T14:53:19

Okay, the whole rotation thing is bugging me. Actually, it''s not bugging me but I remember profanity not being allowed. I also assume that we''re all familiar with matrix multiplication, the fact that it''s not commutative, and therefore rotation transformations done with them are not accurate but their close enough since they''re done every frame and in tiny increments. I was re-reading a book because I had just finished reading an article on physics equations and games and my head was hurting from all the big words and funny symbols. Anyway, a line from the book caught my attention, "angles are given with respect to moving axes". So, how about we use world coordinates instead of local coordinates? Will that finally work? It will be more work to figure out the forces relative to the world from the orientation of the forces in local coordinates, but seriously, if I have to play at .1 fps to get rotations done right, I just might do it. So, am I off my rocker or what?

Math and Physics Programming

Started by RolandofGilead September 27, 2002 10:00 PM

9 comments, last by RolandofGilead 22 years, 4 months ago

Anonymous

September 30, 2002 02:53 PM

Okay, here''s the thing. *Rotation* itself does not commute, regardless of the underlying representation (relative Euler, absolute Euler, quaternions, etc). This is a property of 3D space, and there is no getting around it. The Lie algebra of 3D rotations is a curved space.

-Jonathan.

can't we just stop the axes from moving?

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can't we just stop the axes from moving?

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