xml parsing - Viewpoint for X3D Centering -


can please me in calculating center of rotation , position of x3d object? i've noticed aopt tool instantreality adds like:

<viewpoint def='aopt_cam' centerofrotation='x y z' position='x y z'/>

the result nice, object zoomed, centrated , center of rotation somehow "inside" object (x,y,z, center). must avoid using aopt, how can obtain that, (i.e. via javascript) pheraphs looping trough xml coordinate point , doing calculations...? i'm using x3dom render object.

many thanks.

"aopt_cam" name of viewpoint. centerofrotation , position values automatically computed browser (instantreality in case).

in order compute these values need know object size (boundingbox) , math compute viewpoint should located ('position' attribute) in local coordinate system. need know object displacement in coordinate system. if not specified should (0,0,0)


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