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[diderot] View of /branches/charisee/ertest/vispaper/hessian-magnitude2/notes.txt
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View of /branches/charisee/ertest/vispaper/hessian-magnitude2/notes.txt

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Revision 2892 - (download) (annotate)
Fri Feb 27 06:03:15 2015 UTC (6 years, 2 months ago) by cchiw
File size: 589 byte(s)
notes
    /* Everything else is used to compile field ∇⊗∇|∇s| by hand
    // ∇_j {2*H_i•g/(2*sqrt(g•g))}
    //Using the quotient rule on ^. 
    field#1(2)[2] a=2*H•g;
    field#0(2)[2,2] dela=∇⊗a; //or 2*(g•J+H•H)
    real b=2*sqrt(g(pos)•g(pos));//sqrt has not been lifted to work on fields
    field#0(2)[2] delb=2*a/b;//had to be derived by hand since ^
    field#0(2)[2,2]  f3=(dela*b -(delb⊗a))/(b*b);
    
    //vis friendly
     output tensor [2,2] out2=(( g(pos)•J(pos)+H(pos)•H(pos))*2*b -((2*2*H(pos)•g(pos)/b)⊗(2*H(pos)•g(pos))))/(b*b);
    */

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