vellum instance orientation

[dyei nightmare]

how can you orient vellum instances on the solver driving every instance with force?, i wanna turn the z axis of each instance in the direction of the force but maintaining the y axis pointing upwards, im defining a matrix  with a cross function for x axis.

i suspect that i have to apply a driedral()  but i dont know where exacty i get the current matrix transform cause vellum doesnt show intrinsics,   so  at the moment my matrix data just rotate randomly due the misterious @w  force  

so how,  can i determine a rotation for each instance on vex?  i know i have to use probably a diedral()  but how?  because i dont know where to retrieve the current matrix transform 

Edited October 21, 2020 by dyei nightmare

[dyei nightmare]

well  i know you have to set up a torque or w angular vel,  but  it doesnt work this way!! 

file - >  vellum_matrix.hip

 

 

[dyei nightmare]

Im still trying to do this with no luck, seems like i cant make work @torque attribute,  the initial vector is coming from vel, passing through diedral() but no luck atm..

[dyei nightmare]

i suspect there is no torque attribute on vellum,  otherwise should it be listed here? 

https://www.sidefx.com/docs/houdini/vellum/vellumattributes.html

[dyei nightmare]

im in the confirmation that @torque and @w  doesnt work in vellum soft bodies, at least not by default 

 

   vellum_no_torque.hip