Zigmund 0 Posted June 28, 2020 Hi everybody! I'm trying to make balloon letters as on the picture. Unfortunately I have a couple of problems. First, it seems pressure constraint distorts balloons in a weird way and forces them to fly away. Second, I can't get such wrinkles, while the balloons look fully filled with air. Here is the file: BalloonTest.hipnc Thanks in advance! Share this post Link to post Share on other sites
ziconic 7 Posted June 30, 2020 Are you planning to have the balloons deflate or squish against one another? If not, perhaps you don't have to use Vellum and can go with a simple rigids sim instead. If you are going to do a Vellum sim, it may be better to sim using simplified proxy geometry and then point deform the results to high-res geometry that contains additional detail (e.g. the fins around the balloons, wrinkles) that isn't going to be affected by the sim. Also, your current sim takes place in a vacuum with no external forces, so any tiny velocities that arise from resolving the constraints can move your geometry around unpredictably. You might want to attach your balloons to a string that is pinned at one end, and apply an upward force in the Vellum solver to push the balloons up, for example. Share this post Link to post Share on other sites
Zigmund 0 Posted July 1, 2020 Yes, I want to make initially deflated balloons that will be inflated and as a result collide with each other, that's why i decided to make a vellum sim. I added pin to target constraint be low stiffness, but balloons still try to fly away. Funny thing, it looks like it is no a whole balloon moves somewhere but a certain area of the balloon that is pushed from the inside and pulls the rest of the balloon... Share this post Link to post Share on other sites
