Re: standard matrix with aspect ratios

• To: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
• Subject: Re: standard matrix with aspect ratios
• From: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Date: Thu, 5 May 2005 05:48:04 -0500 (CDT)

Can do this without undo the aspect ratios of the actual
Display: first call getMatrix to get m1, then use you
mimic of ProjectionControlJ3D.setAspect() to undo the
aspect ratios of m1, then carry on with step 4.

> 1. Undo the aspect ratios by calling setAspect() again
> with the numerical inverses of the aspect ratios (i.e.,
> 1.0/aspect(0), 1.0/aspect(11), 1.0/aspect(2)).
> 2. Call getMatrix() to get the matrix = m1.
> 3. Call setAspect() again to reset the aspect ratios.
> 4. Call
>   MouseBehaviorJ3D.unmake_matrix(rot, scale, translate, m1)
> to get the rotation angles, scale, and translations of the
> matrix.
> 5. Call MouseBehaviorJ3D.make_matrix() to make a matrix m2
> with the same scale and translations of m1, but with the
> rotations for an overhead view.
> 6. Use MouseBehaviorJ3D.multiply_matrix() to mimic the
> code in ProjectionControlJ3D.setAspect() to apply your
> aspect ratios to m2.
> Something like that.

• Follow-Ups:
  • Re: standard matrix with aspect ratios
    • From: Don Murray

• References:
  • Re: standard matrix with aspect ratios
    • From: Bill Hibbard