Hi there,
I've created a dancing animation in Cinema 4D and brought it into MD as an alembic file. Dressed my character and simulated the animation.
After watching back, it seems like the clothes are bouncing up and down unnaturally, and is especially noticeable at the end when he stops dancing the clothes are still bouncing up and down.
I thought I could've accidentally turned on the wind modifier but I checked and it wasn't activated. Any idea of what this could be?
Linking the video and project file here:
https://drive.google.com/drive/folders/1-9EGXPrv5bpFIgxR-FA1sWXush-Ka30J?usp=sharing
Reviewing it now: (well done by the way you have a healthy number of elements )
A number of things :
If you want the hood to stay up on the head when animating, such that it does not bounce upwards when the avatar motion jumps upwards.This can be achieved in a few ways > by dampening the physical cloth preset (internal dampening) for that item of clothing or by limiting it's movement using tacks to prevent the garment assembly moving too far off the avatar. Or finally changing the cloth preset choice for this garment item. It might be broken down into a couple of fabrics physical presets that behave differently. > (friction, dampening, density)
If so might want to attach the tacks to strategic areas that limit garment bounce > eg: at the base of the hoody to the avatar lower neck with tacks ... this will limit the movement of the hoody but still allow a natural cloth movement. A tack can have some thread length so this will allow some extension movement of the hoody base but limit it so the top of the hoody always sits well positioned on the avatar.
The same tip might be used for the hoody lower ribbing cuff and also the sleeve cuffs. These can all be used as points where you might reduce the movement on the avatar. (also a line tack of say 30mm on the top shoulders seam to avatar). You can use a tack (or line tack) to avatar at these points or you can increase the hoody sleeve cuffs & lower ribbed torso cuff > pattern piece (fabric) physical preset friction so it's has more friction to the avatar surface. (Hoodie edges + Hoodie edges 2) This can create a more sticky cloth for parts that aid holding these elements on the avatar skin surface such that they do not slide so freely.
The mask is basically going to stay on the avatar face as it moves so for the strap around the avatar ears you can use line tack to avatar to stitch that neatly around the ears, and maybe a couple of tack to avatars that will keep it attached at all times across the motion.
The cap peak is getting whacked down by the hoody as the weight of it comes to bear on that cap cloth peak object > to counter this (as the cap is not really seen under the hoody) I would set all the cap patterns to 'strengthen' and 'solidify'. This does two things it makes the cap physically harder and also burns that into the fabric shape so it can still move but under resistance of internal cloth strength. As a cap can be quite stiff this should keep this element firm.
You could also select the (3) hoody inside pattern pieces > 'strengthen' (pattern piece will go orange) > then simulate so they sit stiffer > in simulation (T) position and then stop the simulation > then in static mode > solidify the same 3 pattern pieces (right click mouse in 3D window) > and unstrengthen them. What this does is raise the lining of the hoody to a stiffer profile at the start point of the garment assembly and animation lead in (T position).
more to come ...
Wow, what great info I am going to play with these settings a ton. Thank you so much, this is SO helpful!
Last question for you. As I watched this scene it felt like the animation was playing more rapid than it should, like it was an fps problem. My scene is all in 24fps and interestingly I noticed that on the simulation quality there is the 'Time Step' setting. From what I've read so far, the default is for 1/30fps (0.03333). I decided to play with that setting and change it to 1/24 (0.04166667) figuring maybe this is more for 24 frame projects. After I did that and exported, everything looked and played PERFECTLY. Am I on to something with this setting or can you explain more about what 'Time Step' does?
I also noticed that some of the Fabric preset had 'Default for Simulation'. I gave those a basic Cotton Canvas for testing. Do you think that 'Default for Simulation' was causing any of those issues?
Yes you can adjust time steps to suit your fps but that really depends on what your next workflow is. Time steps are the vertex trajectory for all the mesh points in the imported avatar/props that the cloth will collide with, so basically MD is recording how the cloth interacts at a mesh vertex point against these surface changes (vertex vector = mesh cache). It's there to adjust to suit your next pipeline workflow - so if that works for you then go for it. > The more frames the slower the sim for the project.
You can definitely change the fabric preset from the default fabric (you should always do that to suit your garment type). And yes changing the fabric physical preset will have a massive effect on the animated outcome. So you do need to try this out. In general if the fabric is bouncing around it needs to be constrained (using tacks, stiffening, and solidify) , and then most importantly the fabric preset type will have the next greatest effect. I would plan on doing things like making the cap,mask, stiff as they don't really move. Then I would focus in on the trouser waistband & trouser leg cuffs and pocket straps and make all these sit with higher friction and solidify so they don't move so much and maybe add in some tacks with long thread so they can still whip around but on a leash.
So the fabric preset for the trousers and hoody should differ. Also the hoody fabric preset weight could be increased as that type of cotton is pretty heavy. (look at knit fleece as a good start point > even try out Sherpa fleece poly260gsm). For the trousers start with cotton (if cotton) and also try out the lighter weight nylons as they give crisp creases unlike cotton that is softer.
For the straps and buckles physical preset you could start with > trim - Leather or > lambskin and for any buckles Trim > hardware.
You could also change the weight (density) for the lower portion of the straps, that may prevent them whipping around so much, and if that still persists try increasing the internal dampening a touch.
Good luck.
YOU ARE A GODSEND. I appreciate all of this info! Thank you for your knowledge. I can't wait to play around with these settings more.
I'm still on the trial but feel confident this is the right software and has a great community like you to receive help!
Would love to see your work and projects too!
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