[comp.graphics] SIGGRAPH 88 paper & course notes errata

ronen@cit-vax.Caltech.Edu (Ronen Barzel) (11/03/88)

Errata for:
    "A Modeling System Based on Dynamic Constraints"
    Ronen Barzel and Alan Barr
    (in SIGGRAPH 88 proceedings)

    "Controlling Rigid Bodies with Dynamic Constraints"
    Ronen Barzel and Alan Barr
    (in SIGGRAPH 88 'Developments in Physically-based Modeling' course notes)

Section C.3 (paper), D.4 (notes p.E-61) ``Point-To-Point'' Constraint:
    Some sign-swapping...

    Gamma^1, Lambda^1, G^1, and H^1 should all have minus-signs;
    Gamma^2, Lambda^2, G^2, and H^2 should not have minus-signs;


Thanks to Mark Nodine at Brown for pointing this out.

-Ronen

[Other errata, which were announced at SIGGRAPH, are:
    Eq 12,13 (paper), C.8,C.9 (notes p.E-57):	Change G to Gamma, H to Lambda
    Eq C.2 (notes p.E-55):			Change Theta to Theta/2
    Eq C.5 (notes p.E-56):			Matrix is transposed
]