dops grp problem

[vfxkid]

hello Again

small grouping problem in dops. Cannot figure out a method on how to grp only the moving objs in a group so that it can be effected by gravity or any other forces.

thanks

grp_test.hipnc

[bhaveshpandey]

you can query the Velocity and position data using the dopfield or dopoptions expression to determine the velocities of each rigid body and then can set up a threshold value to determine whether its moving or not and to include it to a non moving group

for eg. abs(dopoption(".", $OBJNAME, "Position", "velx")) > 0.04 etc.. (note that I have just included velx..you could use compound expressions using &&, || etc.

look for dopfield and dopoption expression in textport

Also I guess the RBD Autofreeze node has some algorithm to calculate whether a body is moving or not or whether its slow enough to be considered as static..so you could dig into it perhaps.

Edited September 4, 2009 by bhaveshpandey

[vfxkid]

hey bhaveshpandey,

thanks for the help but i did us that expression in my example. I used dopfield to query if the objs is moving or not so that it could switch group. I am trying to switch from a non moving group to a moving group. For some reason its not working.

Edited September 4, 2009 by vfxkid