#houdini #vellum #rbd #vex #geometry_wrangle #prim

houdini_vellum_rbd_geo_wrangle.c

// get first point on each prim
i@point_zero = primpoints(0, @primnum)[0];

// get that point's emit frame
i@emit_frame = point(0, '__frame', @point_zero)*.01;

// subtract emit frame from current frame to create age
i@age = @Frame - @emit_frame;

// at a certain frame lower the strength
if (@age == chi('frame')) {
    f@strength = @strength_orig * chf('low_strength');
}