RE: [Algorithms] How to derive transformation matrices

[Steve W. <Ste...@im...>]

> From: ro...@do... [mailto:ro...@do...]
> 
> Having dealt with rotations, what about shear?  I'll leave that aside
> until someone asks the question using an intrinsic geometric
> definition of "shear" (And it does exist).  
> 

Which begs the question to Lorrimar...What did you mean by shear?  I'm not a
matrix guy at all (well, except for the movie which rules) but I do know a
few things about shear forces.  If that is what you meant then a shear is
the perpendicular component of force on a surface.  In engineering we need
material that can withstand shear forces so things won't rip apart.  In 3D
graphics I'm assuming that it will create a moment in the object receiving
the force and instead of determining the deflection and deformation of the
material or illustrating the breakage of the material I also assume you will
use shear to cause the object to move or spin.

R&R