Up-Normal-CopySOP strangeness

[Macha]

I'm trying to rebuild the "Contained Fluid" effected that Andrew Lyons posted on Vimeo:

I think that it can be improved in several places, one of them being an easier zeroing-out of rotations (and perhaps get rid of the copy sop altogether and transform everything directly into the new space, using vopsop multithreading power)

So, I made some new basis vectors basis_x, basis_y, basis_z, and use their attribute names to zero out the rotations.

However, a funny thing happens: The copied animation lags behind the original.

I don't know what is going on there. The directions given by N and UP are not proportional to the copied rotations in a linear way? The start and end positions match, but inbetween they lag.

What's happening?

puzzled.hip

Edited April 8, 2011 by Macha

[anim]

just a few things:

1. swap inputs in /obj/tube_object1/BASIS/vopsop2/subtract3

2. in /obj/tube_object1/rename_atts_for_use_in_copysop

set rename: basis_z to N

basis_y to up

be sure to write up in lowercase, you now have UP in upper case so it's not recognized by copy SOP

3. bypass or delete /obj/tube_object1/xform4

puzzled_fix.hip

[Macha]

Thanks!

Sometimes those old Houdini things still throw me off. The life attribute in pops is another one of those gotchas that I'd like to throw stones and mud at.

Edited April 8, 2011 by Macha

[Macha]

Here is the complete file if anybody wants to have a look at it and play around.

I also posted a vimeo of it, with a mention of the changes:

containedfluids_macha.hip

[ikarus]

very cool!