hello all! I would like to simulate an unrolling of a paper roll exactly like the one shown in the mov I attach
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(you find also the .hip). To better control the exit of the tape from inside the roll, I used a gradient attribute (f@curveumap) that multiplies the intensity of a constrainer stiffness. I animated this gradient thinking I could adjust the exit of the tape, but inside DOP this animation is not read (SOP solver already tried). Do you know a way to do it, or an alternative method to achieve the same result?
but you should not have issue updating the attributes from SOPs on geo or constraints using Geometry Wrangle DOP, Vellum Constraints DOP or SOP solver DOP saying you tried and didn't work doesn't help as much as .hip file would
but it sounds you are on the right track, animating either stiffness on Soft Pin Constriaints or animating i@stopped attribute on geo and updating them in DOPs should give you result you want
tamte here is an example using your animated f@curveuramp to drive i@stopped attribute in DOPs
wow Tamte, great. Many many thanks.
I tried to generate directly an i@stopped attribute, instead of f@curveumap. But it only works if I update it inside the dop with the wrangle you wrote for me. Why sop solver does not work?
Livio I tried to generate directly an i@stopped attribute, instead of f@curveumap. But it only works if I update it inside the dop with the wrangle you wrote for me. Why sop solver does not work?
your original SOP Solver DOP didn't do anything because you were copying f@curveuramp attribute which vellum solver doesn't use directly so it didn't affect the simulation in any way
if however you had animated i@stopped and updated that I'd expect it to work
here is an example with i@stopped being animated in sops and updated using SOP Solver DOP (note that while I'm taking the vellum solver's first input geo, you can continue object merging the "tape" null as you had it if your animated i@stopped is above that, that will not make a difference)
