Move animation cache to origin (VEX)

Example: Move animated point caches centroid to the origin for each frame.

Logic around the script:

• Run over points

• gather and set the transform

  • Create identity 4x4 matrix variable “xform”

  • find the vector pointing to the center of all the points in the stream with getbbox_center() vex function

  • invert the vector pointing to the center

  • translate the matrix “xform” by the previously inverted vector

  • multiply the first streams point position by the translated matrix “xform”

  • store the translation matrix to a detail attribute.

matrix xform = ident();
vector center = getbbox_center(geoself());

center *= -1;
translate(xform,center);

v@P *= xform;

setdetailattrib(geoself(),"xform",xform);

• To bring back the original animation

  • Read the transform matrix from detail attribute “xform” and store it in a variable

  • invert the transform matrix

  • multiply point position by the matrix.

matrix xform = detail(geoself(),"xform");

xform = invert(xform);

v@P *= xform;