Daz 3D Introduces dForce Physics Engine

Space Jingoroh

　It does not have to be the same as the actual physical properties as long as it resembles the actual cloth behavior.
　However, simulation settings are more intuitive and easier to operate if they resemble actual physical properties.

　Linear spring constant (?) with no fixed upper limit of elongation cloth may bounce like a yo-yo when hung from a high place, a movement that is unfamiliar to us in everyday life.
　When you try to set up a setting to suppress the unnaturalness, a new and different unnaturalness is created, and you may end up going in circles.

　The current simulation settings for creating animated movies with dForcs cloth are so difficult just to keep it from exploding that I don't have the luxury of pursuing the texture of the cloth's behavior.
　In some cases, I have to give up even the animation motion I want before the cloth texture.

　In the case of long animated movies, even if explosions can be avoided, various energies can accumulate in the cloth, and the geometry can become tangled up in a mess.

　It takes time to check the simulation results, and it is very difficult to find a compromise between the simulation settings.
　I am willing to go through the hard work of creation, but the struggle to find a compromise in the tools is sterile.

　If I were creating a still image, I would have fewer problems because I would not be able to see the motion behavior.

MetalSunde94

Hope in the future perhaps Daz 5.0 or in a future update there will be some similar simulation like there is in Marvelous Designer which is in "real time" so you can adjust the clothing easier!

Space Jingoroh

　The fact that the dForce fabric stretches without limit seems to magnify the unnaturalness of the fabric.

　It cannot limit its ability to stretch abnormally when fast movement or high wind speeds are required.

　It seems to me that there should be an upper limit to the stretch rate of the fabric.

　I would like a parameter to set the maximum elongation rate.

barbult

There are stretch controls in the surface settings. Have you experimented with them?

barbult

There's also velocity damping in the surface settings. It sounds like that would help your high speed or wind situation.

Space Jingoroh

barbult said:

There are stretch controls in the surface settings. Have you experimented with them?

　Thanks for the reply.

　I have been trying to change various Surface parameters and animations, but with not so good results.
　Sometimes the elasticity is too strong and it bounces around and sometimes it moves in a way that doesn't seem like cloth.
　Sometimes the garment jerks and vibrates unnaturally, even when the person is standing still.
　Even if the wind is very strong, it is also not good for the hair to grow long in strong winds.

　Also, it may depend on the product, but some parameters may freeze if the value is raised above a certain level, which may limit the adjustable range.
　I use a relatively fast graphics board, packed with large VRAM, and simulate one item at a time, but I cannot avoid this problem.

　If I'm making still images that don't animate, I only need one frame to complete the process, which reduces the problem.

Space Jingoroh

barbult said:

There's also velocity damping in the surface settings. It sounds like that would help your high speed or wind situation.

　I have adjusted the dForce hair stretching and the velocity-related parameters, but my hair still grows long in strong winds. 

Space Jingoroh

　If the dForce simulation is repeated many times, some noise data may remain on the garment.
　At that time, no matter how many times the Clear button was pressed, it did not return to the perfect initial state.
　Sometimes when I run the simulation in that state, the polygons partially collapse.
　In such cases, you need to delete the garment and dress it again.

barbult

Space Jingoroh said:

　If the dForce simulation is repeated many times, some noise data may remain on the garment.
　At that time, no matter how many times the Clear button was pressed, it did not return to the perfect initial state.
　Sometimes when I run the simulation in that state, the polygons partially collapse.
　In such cases, you need to delete the garment and dress it again.

I've never seen it not clear. That's strange.

Space Jingoroh

barbult said:

Space Jingoroh said:

　If the dForce simulation is repeated many times, some noise data may remain on the garment.
　At that time, no matter how many times the Clear button was pressed, it did not return to the perfect initial state.
　Sometimes when I run the simulation in that state, the polygons partially collapse.
　In such cases, you need to delete the garment and dress it again.

I've never seen it not clear. That's strange.

　Yes.
　Strange.
　It takes a lot of time and effort, but it can be cured by re-dressing it, so that's how I get around it now.

starwarsorivus

Space Jingoroh said:

　If the dForce simulation is repeated many times, some noise data may remain on the garment.
　At that time, no matter how many times the Clear button was pressed, it did not return to the perfect initial state.
　Sometimes when I run the simulation in that state, the polygons partially collapse.
　In such cases, you need to delete the garment and dress it again.

Reminds me of applications which don't have clean uninstall...or ROMs of NES/famicom games which were notoriously buggy.

Space Jingoroh

　The explosion of dForce is still a big problem.
　Often I cannot use the poses I want or have to give up using dForce because of explosions.

　This is especially true in animation.

　In this case, even though it was a still image, I had to give up using dForce on the skirt after adjusting many parameters and trying many times.

Space Jingoroh

　Movie　https://i.imgur.com/NqwuyNY.mp4

　Because of the explosion, dForce was still not available for movies.
　The reality is that we spent more time trying to see if dForce would explode than we spent working on the motion.

　I wanted the skirt to hang downwards by gravity, and I also wanted the wind effect.
　It's a shame.