Hit Enter to search or Escape to close

Ask me anything > question#852


September 29, 2021

Do you have a video clip or tutorial on how to create stereo(or more accurately Left/Right) flexes on a model, I haven't found any documentation of achieving this but I think I've seen a couple of your models that do it. Essentially what I mean is a flex that starts in the middle rather than the far right that essentially is 2 flexes in 1.


If you use VTAs for the flexes, it's very straightforward.

A traditional mono (one slider controls the entire flex) is set up in this way:

flexfile "flex.vta" {

flex "my_flex" frame 1 decay 0


flexcontroller phoneme my_flex "range" 0.000 1.000

%my_flex = my_flex

Assuming that you want the flex to be mirrored along the y=0 line, then you simply do this instead to make your flex stereo:

flexfile "flex.vta" {

flexpair "my_flex" 1.0 frame 1 decay 0


flexcontroller phoneme right_my_flex left_my_flex "range" 0.000 1.000

%my_flexL = left_my_flex

%my_flexR = right_my_flex

In summary: Use "flexpair" instead of "flex", declare both a "left_" and a "right_" flexcontroller, and then suffix your binders with "L" and "R" and assign them to your left and right sliders. Note that the order is EXTREMELY IMPORTANT. You MUST declare your flexcontrollers as right and then left, and you MUST declare your binders as left and then right. Source Filmmaker is naive and simply assumes that if it sees a right flexcontroller or a left binder, then it assumes the next flexcontroller is left and the next binder is right. If you get the order wrong, then your sliders will affect the wrong flexes.

Ask me how I know.


If you're using DMX, it's a lot harder. The solution: don't use DMX for stereo flexes. Just use VTA. Trust me. It's easier.