hi Rob,
some starting pics: http://www.flickr.com/photos/superrobber/4305067091/
looks really nice. congrats.
i've tried the (vtransform-rot) but with this function somehow i just
can't get the rotation out of the (get-transform) matrix
the manual says it's kinda ment for use with normals ?
i believe you can get the direction vector like this:
(define (global-dir p)
(vtransform-rot (vector 0 1 0)
(with-primitive p
(get-global-transform))))
; to draw it
(let ([dir (global-dir p)])
(with-primitive (build-ribbon 2)
(hint-unlit)
(hint-wire)
(pdata-set! "p" 0 (vector 0 0 0))
(pdata-set! "p" 1 (vmul dir 5))))
but i'm not sure that this would be very useful in your case, because
this is just a direction vector and not a rotation vector. if you want
the rotation angles, you can try (matrix->euler). but since you want to
interpolate between rotation matrices, you might need quaternions.
best,
gabor
