anicg

I have a lot of geometry but only want to use part of it. I have selected what I want, delete non selected, but I'm left with all the groups from all other geometry. Can I keep only the groups that are in the current geometry?

Thank you, I'm almost there, I get an attribute d which has 7,9 and 21, I only need the 21, the highest number, one value, what do I need to add to get that?

I have an vdb (sdf) to which I apply some noise in a volume vop. The noise is applied everywhere. I need it to be limited to some areas, so I need to create a mask. The mask can be driven by a noise. Is it possible to create a mask for a vdb? P.S. the vdb was a polygon geometry, would it be an option (and how) to use a mask from polygon into vdb? whichever way exists and works

For each connected piece, get the bounding box, find the axis with the maximum scale and remember just the number. Say e.g. a box is 18 by 3 by 2, a grid is 4 by 7, a sphere is 15 by 15 by 15 then we need 18, 15, and 7. Then find the max of these maxs (18 vs 7 vs 15) and assign it to an attribute, such that we end up f@maxattrib = 18.

I need to primitive to remember it belongs to a first set of primitives, and to remember it belongs to a second set of primitives. If I call name1, the set with name one shows up. If I call name2 the set with name2 shows up. Each primitive should have two names.

The two lines intersecting are not from the same geometry, I've merged them and fused them, some intersections look ok but a lot of the others are messed up like these two examples. Do you know what could be causing this?

I have a very simple shader and here are also the mantra settings:

I've keyframed it yesterday several times, the problem is that the newly emitted smoke needs different settings than the older one that's been around for a while, and this is even in later frames because there is still new smoke being emitted, any change to satisfy the old one upsets the new, any that satisfies the new upsets the old.

Done simulation 18 times, the problem is still there: the smoke is hairy. I've used the control field with speed, tweaked gasdisturb settings, at different block sizes, different strength, tweaked temperature diffusion, the smoke is still hairy. I've watched countless courses / tutorials, I've even replicated their exact settings, the smoke is still hairy. If I bring down the strength of the gasdisturb the smoke is too smooth in the first 100 frames. There is something else, I hope someone knows what's going on. After 18 times, this is what the smoke looks like:

A sphere and a box, and rbd packed object and a collider, but the collider sphere goes very very fast, it goes in one direction then back again. The problem is that the box (rbd packed object) realises there is a collider only when the sphere is on its way back. Result: the box goes in the opposite direction than where it should go. Any idea what puts that box to sleep when the sphere is crossing fast? Here is a flipbook slow_reaction.mp4

the collision padding is the cure, thank you. I had to bring it down from the default 0,02 to 0,00001

I've changed the contact breaking threshold in both directions drastically but they keep dancing. I couldn't find the collision padding, I'm using the bulletrbdsolver

The small fractured wood pieces are annoyingly agitated, they keep active all the time making the whole thing look unrealistic. How do you calm these things down? here is a flipbook of their dance: dancing_pieces.mp4

I have changed the control field of all three gasdisturbs to use the speed of the velocity, but for some reason the smoke loses its shape at the end (new hipfile included) hairy_smoke.hiplc

Here is the hipfile, I kept changing the parameter and tweaking but the result is still the same. I don't know how to use the speed of the velocity field as a control field as user Skybar mentioned above. hairy_smoke.hiplc