I have a snake moving along a spline, with a spline wrap and an animated offset, working fine. The problem is I want to have a flicking tongue. The tongue animates out, up, and down. When I make the tongue a child of the snake, the spline offset animation gets wonky, because the length of the snake is changing.
So the second thing I tried was to constrain the tongue to a point in the snake's mouth. However in xpresso, following this guide, it doesn't work, guessing because of the spline wrap animation.
Then I tried to get Cactus Dan's point constraint tools going, downloaded and unzipped them into my plugins folder, but they wouldn't show up under my plugins, so hit a roadblock there.
File is attached. Any guidance greatly appreciated, thanks.
point constraint.c4d