Gravity & Wind Resistance for Sim
friqenstein
Posts: 49
Greetings,
I am a bit confused with these two settings, as, at times, they tend to do nothing at all or just the opposite of what is expected.
As an example, if I create a new Primitive, a plane, and I add dForce to it so that I can get it to drape like a vertical sheet/curtain, there tends to ALWAYS be some distortion on the right-hand side, as it never fully settles on these right edge.
So, I drop the air resistance to 0, thinking that, without air resistance, the 'sheet' should just drop down as I want becuase there is no medium to slow it or interact with it... but that is not the case. With 0 air resistance, the object simply reaches the bottom, and then magically 'bounces' up again creating a ridiculous effect and ruining the entire simulation. To me, this doesn't make any sense.. it's like turning down the air resistance actually inverts the gravity or something to that effect. Am I missing something, or is air resistance just like that in this program?
All I am trying to do is create a draped cloth in the background as a backdrop, which should be simple enough, yet, it isn't.
Regards.
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Comments
How dense is the resolution in the plane, High resolution can cause dForce to move to the sides.
If is bounches back up I assume it is pinned in the top, and therefore will react to the pinning.
You can try to decrease gravity so it will fall slower.
@felis,
It is pinned at the top, to hold it in position. I increased gravity to 1.2 and 2.0 and it just went stupid. I'm trying to find a happy medium so that it will settle more naturally. Maybe I should lower the divisions of the plane?
Edit: I forgot to answer your question.. the plane is 10m @ 100divisions.
Thanks for the respone.
Regards.
Why would you increase gravity? That just applies more force to the simulation and more movement.
Because, as you said, more gravity means more force, or more importantly, more downward force and less lateral movement. If something is 'heavier' due to increased gravity, it should be less affected by wind resistance.
I increase gravity on dForce hair pretty much all the time. It makes the results less poofy.
For dForce hair yes, there it can give a larger pull.
But have you tried it for dForce cloth?
Why would it matter? Gravity is gravity, it only pulls in one direction, down... and if there is no other applied effects on the medium that it is in, it should fall straight down.
I guess some renders or screenshot of your results would help understand what is going wrong. I experimented with a 10 meter plane with 100 divisions. I'm not sure how you pinned your plane at the top. I placed 3 dForce Magnets as pins at the top. I did an animated simulation so I could move the pins on the X Axis to drape the fabric. I used the geometry editor to rotate the mesh triangulation to make the draped curves smoother. I just used default gravity and air resistance. It looks OK to me. I don't see any obvious anomaly on the right side.
I did once I turn the actor upside down increased gravity. to pull the hair straight. Then I put electrical sparks in the actor's hair standing straight up. He forgot to discharge so capacitors in some droid.
I tried another with just two corner pins. This is simulation from current frame, memorized pose, etc. default settings (Gravity 1, Air Resistance 0.15)
Then I increased Gravity to 2 and set Air Resistance to 0.