Control Animation of Individual Pieces

[ParticleSkull]

Hey guys,

I would usually do this easily with a Copy Sop (Copy to Points now), just like on Rohan Dalvi's Mograph Series but, since the fragments are not over points, I have no idea on how to do this without a stamp.

Here's something very similar from what I need:


Thx,
Alvaro

[iamyog]

assuming you have pieces neatly separated, kind of what a voronoi fracture would output you, you can just pack via an assembleSOP (check "create Name attribute" and "create packed geometry").
This will give you one packed primitive per piece and thus one point. You can manipulate them as you need via the intrisic attribute "transform"

A point wrangler running this code should get you on the tracks.

float _seedpiece = rand(@ptnum);            // multiplier per piece
float _seed = fit01(_seedpiece, 0.5, 1);    // unique rotation speed multiplier

float _startframe = ch("startframe");       
float _fadeout = ch("fade_out") * _seedpiece;

matrix3 _m = ident();   // initial transformation matrix

float _angle = (clamp((@Frame - _startframe), 0, 1000) * _seed) * ch("speed");
vector _axis = set(rand(@ptnum + 1), rand(@ptnum + 5), rand(@ptnum + 9));   // random rotation acix

_fadeout = 1 - fit(clamp(@Frame - _startframe, 0, _fadeout), 0, _fadeout, 0, 1);
vector _scl = set(_fadeout);

rotate(_m, _angle, _axis);
scale(_m, _scl);
setprimintrinsic(0, "transform", @ptnum, _m);

 

Edited March 3, 2017 by iamyog
typo

[stickman]

If one of you would share a scene with this code working, i'd be very grateful.
My attempt has failed... would like to be able to grok this.

[ParticleSkull]

Hey David, check it out, it's attached:

Control Animation of Individual Pieces.rar

[stickman]

Thanks!

 

[anim]

there is also Transform Pieces SOP, so that you can do your animation on particles and then just transform packed pieces with it

[ParticleSkull]

Hey Tomas, thank you, I wasn't aware of this sop. Had a look but it's not that intuitive though

[anim]

maybe not the most intuitive, but tends to work once you understand how it works