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Why Did dForce Hair Tear dForce Dress?

FauvistFauvist Posts: 2,152
in The Commons

Why Did dForce Hair Tear dForce Dress?  The two products were the hair https://www.daz3d.com/biscuits-noa-hair-with-dforce-for-genesis-8-female and the dress https://www.daz3d.com/hc-dforce-simple-princess-line-outfit-for-genesis-8-females

Both products were made for Genesis 8 Female - I fit them to Genesis 3 Female, to a body morph of my own making.

I loaded the figure, loaded the dForce dress onto it - but didn't simulate it.  Then I loaded the dForce hair and fitted it to the figure.  I didn't alter the hair and used the standard preset where the hair is flying up in the air behind the figure.  I didn't change the figure or the dress from the zero position and didn't add any pose.  Then I siumulated the hair, and it fell into a ponytail behind the figure.  I stopped the simulation at around 50% because the hair looked like it was in a natural ponytail.  The hair looked good, but where the hair touched the back of the dress, the dress got ripped and shredded. In one of the attached images I made the hair invisible to show you the back of the dress.

I don't know why it happened.  I don't know how to prevent it from happening again.  When I use that dress, with non-dForce hair which touches the dress, nothing happens to the dress.

Anybody have any answers?

Thanks!

torn_dress_1.png
1256 x 1718 - 2M
torn_dress_2.png
1120 x 1486 - 1M
torn_dress_3.png
1114 x 1174 - 1M

Comments

  • IceCrMnIceCrMn Posts: 2,142

    They impacted each other during the simulation.

     

    The simplest solution is to sim one, hide it or turn on "Freeze Simulation" under parameters for it.

    Then sim the other.

     

    There are more complicated ways to solve this with surface settings and also weight maps.

  • AllenArtAllenArt Posts: 7,172

    My advice is to sim and freeze the dress FIRST.

  • FauvistFauvist Posts: 2,152

    AllenArt said:

    My advice is to sim and freeze the dress FIRST.

    When you freeze the dress after simulation, does that mean it won't get shredded when the hair touches it?  Do I have to do anything to anything else in a scene so that simulated hair doesn't effect it? 

  • AllenArtAllenArt Posts: 7,172

    Fauvist said:

    AllenArt said:

    My advice is to sim and freeze the dress FIRST.

    When you freeze the dress after simulation, does that mean it won't get shredded when the hair touches it?  Do I have to do anything to anything else in a scene so that simulated hair doesn't effect it? 

    Before you sim the dress, hide the hair. Then freeze the dress after you simulate. That will keep it where it is. Then unhide the hair and simulate it. The dress will not change. Make sure tho that the hair is not intersecting with the dress at the start of the simulation. 

  • Richard HaseltineRichard Haseltine Posts: 102,418

    While freezing the clothing and then simulating the hair is probably best in many cases it is also worth making sure that the Collision Layer value for the hair (in the Surfaces pane) is higher than the values for the clothing items - that tells the system that the higher value is mant to be on top of the lower.

  • nakamuram002nakamuram002 Posts: 793

    Richard Haseltine said:

    While freezing the clothing and then simulating the hair is probably best in many cases it is also worth making sure that the Collision Layer value for the hair (in the Surfaces pane) is higher than the values for the clothing items - that tells the system that the higher value is mant to be on top of the lower.

    Why do most PAs make the hair "Collision Layer" 1?  I wonder if it is because they do not believe in clothing.  I usually add 80 or 90 to the hair's default value.  I always make sure that clothing has a "Collision Layer" value of less than 20.

  • Richard HaseltineRichard Haseltine Posts: 102,418

    I agree it would seem sensible to give hair-hair (as opposed to fur) a higher layer value.

  • WendyLuvsCatzWendyLuvsCatz Posts: 38,528

    I am weird but I now simulate everything worn separately and save each thing as a scene subset then put it all together afterwards because especially with animations which I do, Dforce is explody AF otherwise 

    never ever have the smoothing checked running a sim either.

    I use smoothing afterwards though when I put it all together and set the lock distance to maximum with hairs set to collide with clothing etc and interactive update.

    I will even add offset invisible geoshells for collisions 

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