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Dynamic Hair Physics! | Roblox SmartBone 2 — Transcript

by Paul1Rb · 3,482 words · 489 segments · language en · Watch on YouTube

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0:00so I've made few smart bone tutorials
0:01already and you guys have been
0:02requesting that I make hair so I'm going
0:04to show you how to make Dynamic Hair
0:06physics simulation on Roblox and I
0:08already have a hair model I've made but
0:10whenever I try to add hair physics to
0:12this I'm just going to show what happens
0:15well as you can see that so I kind of
0:18thought that hey I need to use a
0:19different hair model and because of that
0:21I'm going to export this hair into
0:22blender because this one is kind of
0:24universal and this is a good example of
0:26how to rig the hair for smart bone and
0:29if you want to export this yourself you
0:31can right click on the model and press
0:32on export selection this will export it
0:35as an obj file but anyways let's get to
0:38blender now and to import it you just do
0:41file import and then select the obj
0:46Legacy and then it's going to appear
0:48right here after you import it and then
0:50you want to position it in the center so
0:53I'm just going to enable the screencast
0:55Keys really quickly so you can see what
0:56I'm pressing but you want to go into the
0:58edit mode select
1:00everything and then search for the carer
1:03to selected option now go back to the
1:05object mode and then search for origin
1:09to 3D cursor this will make it so the
1:11origin point is going to be in the
1:13center and then from there you can just
1:15reset the location in the transfer menu
1:17on the right like this and now since we
1:21exported this hair from Roblox there is
1:22some fixing that we need to do and that
1:24is because if I let's say press L on
1:26this part you can see how it's not
1:29connected to the ENT entire mesh and
1:31that's because of how Roblox basically
1:32just cuts every mesh into like these
1:34different sections but right now in the
1:37edit mode you want to select everything
1:39going to the vertex selection and then
1:42you want to basically just right click
1:44and select the mge
1:46vertices and choose the by distance
1:49option here you can see that it removed
1:51over 1,000 vertices so now if I press L
1:54on this part you can see that it
1:56selected the whole here instead and this
1:59is a separate part of the hair okay and
2:02now this is going to be the rigging part
2:04and I've said that this hair is
2:06universal and that's because of its
2:09volumes of hair you have a bit of the
2:12strings right here that go from the
2:14sides as well as this whole main section
2:16in the back and these parts are what you
2:19want to apply the physics simulation to
2:21you can apply them to all of these hair
2:23on the front but there isn't really a
2:25need for that it would just be an
2:27Overkill and also very performance heavy
2:30but anyways let's just add the Armature
2:33by pressing shift a and then selecting
2:35the Armature and you have to do it from
2:37the object mode and then I forgot to
2:39move the cursor to the word origin okay
2:43but the Armature should have applied
2:44right
2:46there so you just have this bone right
2:48here in the
2:51center and this is going to be the root
2:53bone that we want to position roughly
2:55around where the neck is going to be and
2:57how I like to structure the hair is that
2:59there is going to be the root bone and
3:02individual bones going out from it these
3:04other bones aren't going to affect
3:05anything except the bones are going to
3:07let say go down with the strengths of
3:10the
3:11hair but while being in the edit mode of
3:13the Armature that is after you're going
3:15to the Armature just press on Tab you
3:17want to select this point right here on
3:19the top and just extrude it with E and
3:23you want to hold down the scroll wheel
3:25to extrude it on the
3:28axis and us want to move it to the back
3:31right here and another thing that you
3:33can do is to view the Armature better
3:36you go to the object data properties
3:38right here and under the viewport
3:39display you select in front so now it's
3:42going to be a bit easier and where we
3:44want to position this point depends on
3:46the hair for example you can see that
3:48most of the hair is going out from this
3:51section right here so that's where the
3:53physic simulation is going to happen we
3:56don't want this top part to be moving
3:57really so I'm going to position it
3:59around this area where all of the other
4:01bones are going to go out from two
4:04that's going to be around
4:06from right here and now we add bones
4:10that are going to have the physics
4:12attached to them and we need to go down
4:14with the flow of the
4:22hair and you can see that there are
4:24these two sections one is at the back
4:26right here and the other is at the front
4:28we want to position these bones between
4:31them so they automatically adjust the
4:33proper
4:55weight and I'm going to deselect the in
4:57front for now
5:05okay and this part this karchy of bones
5:08that goes down this is basically going
5:10to handle this whole volume of hair and
5:13now we want to add two separate trees
5:15one going on the left that's going to
5:18handle this
5:19volume and one on the right that's going
5:21to handle this right volume and I also
5:24feel like these two parts right here
5:25don't really need to move but you could
5:27add more bones if you wanted to so again
5:29I'm going to just extrude
5:32it move it
5:35up and then move it to the
5:43left and I'm going to position it
5:46between these two right
5:50here and let's just go down with the
5:52flow of the her again
6:21and how many bones you add is also
6:23entirely up to you the more bones the
6:25more performance heavy is going to be
6:27but you're also going to have more
6:28detail and now we do the same for the
6:31other part and this doesn't really have
6:33to be too symmetrical
7:12so we have the back section basically
7:14just done I just need to adjust this one
7:17right there and now let's move to the
7:19front
7:27one and for this one I just want to
7:29position these bones around these stains
7:31like
7:43this then to select these
7:47both and move them upwards to where the
7:50strength is basically just
7:57starting and just keep exing them
8:18downwards so that's it for basically
8:21creating the Armature you don't need to
8:23cover the whole here or make the
8:25structure so you have these chains of
8:26Bones going to every basically strain so
8:29like this will give a good effect
8:31anyways so now we want to apply the hair
8:33to the Armature and we do so by
8:36selecting the hair then the Armature and
8:38pressing on contrl and P if you don't
8:41have these options with the Armature
8:42deform that means you selected them
8:44incorrectly if I for example select the
8:46Armature then the hair I'm not going to
8:48have these options right there so again
8:50select the hair then the Armature and
8:53press on contrl and P then you just want
8:55to select with automatic weights and now
8:58we need to do some weight adjustments so
9:01while having the object selected you can
9:03see that you have a lot of these vertex
9:05groups whenever you press on one and go
9:08to the weight pain mode this will make
9:10it so it's going to show you the weight
9:12of each bone and this means how much
9:14influence the bone has over that area
9:17the first thing we need to do is remove
9:19the weight from these bones right here
9:21because they aren't going to be moving
9:22anyway and we do so by going to the
9:25objects edit mode selecting everything
9:28and pressing all
9:30remove so we removed everything from the
9:32root bone right here and we also want to
9:34do the same for this
9:36bone so select everything and then
9:41remove and now this bone right here is a
9:43bit more tricky because we just need to
9:45remove the weight from this top part so
9:48you can go somewhere to like the back
9:51view and then in the edit
9:54mode go to the wireframe view and want
9:58to just select the this stop
10:02part and I didn't select everything
10:05properly and then just press on remove
10:09you can see how these strains of hair
10:10are basically being separated from right
10:12here so you want to simulate the physics
10:15from this point so that's basically
10:17going to be everything for these four
10:19bones in the
10:23middle except just few adjustments that
10:25I'm going to show later now if I go to
10:27the next bone
10:29which you can see that it basically
10:31jumps from the bottom right here to the
10:34top that means it switched from the last
10:36bone in the karchy here to the next one
10:38that we made and from this one I just
10:41want to select everything again and
10:42press on
10:44remove then on the lower one again just
10:47go to the front view first here just
10:50select this whole
10:52thing because like I said I don't really
10:54want this to move so I just press on
10:56remove and I just select everything from
10:58this point
11:01onwards and again press on
11:04remove and then you can see how it has a
11:06little bit of weight right here and
11:08don't worry about that we'll fix that
11:12later then I need to remove this
11:15weight so again just select this and
11:18press on
11:24remove then same with this one because
11:26apparently it has a little bit of weight
11:28on this corner
11:30there so just have it selected and
11:33remove and then same with the next one
11:36so select everything
11:40remove and then just go down the karchy
12:11and now moving to the front right
12:16here again this one we just want to
12:19remove and go to the next
12:21bone and again this one is a bit more
12:24tricky and that is because we want to
12:27remove this top section but once we
12:29remove it it's going to immediately
12:32transition to Red weight so this bone
12:34whenever it's going to be physics
12:35simulated is going to go from zero
12:38influence to 100 and this is going to
12:41cause weird deformations so the first
12:44thing you want to do is select around5
12:47on the
12:48weight and just weight painted like so
13:01and this bone I need to go to the solid
13:04view starts from right here and if it
13:06starts from right here we just want to
13:08select everything above it or an easier
13:11way would be to select
13:13everything go to the wire frame View and
13:17then deselect the part that you want to
13:19be moving
13:42try to select
13:45this and while having everything
13:47selected except this part we just want
13:50to press on the remove button so now if
13:52I go to the weight paint it's going to
13:55be adjusted
13:56properly and then it's kind of the same
13:58with these two bones you can see how
14:00they are basically going to the red part
14:03immediately and we kind of just want to
14:05keep it at
14:13Green and same with the Deep right
14:20here and now we just do the same for the
14:22other Str right here
14:50this one is a bit awkward but they
14:51should be fine
15:16okay and now for the last thing with
15:18weight painting because something like
15:19this just happened to me a lot of times
15:22and is because of the automatic WS so
15:25like I said previously for example these
15:27bones right here we don't want them to
15:29have influence over this area and
15:32sometimes even if you can't see any
15:33weight if I put it on like a really low
15:36number and paint it is still going to be
15:39there and yeah we don't really want that
15:41to happen so what I need to do right now
15:44is for all of these BS in the middle I
15:47want to select these part that aren't
15:48supposed to have any weight and just
15:50remove them and sometimes not even have
15:53to do this process but I would rather be
15:55safe
16:16so I just need to remove this for the
16:18groups from 02 to
16:2305 then the same goes for these sides
16:25right here you can see that they have
16:27weight on this area
16:29and this one is from 07 to
16:37010 and same for the other
16:45side so 12 to
16:4915 and the rest had everything removed
16:52so this should be everything for the
16:54weight paint and now let's get to
16:56actually exporting the model so need to
16:58select them go to file export and then
17:01fbx I'm going to name this one smart Bon
17:04ha and in the export settings you want
17:06to select selected objects change this
17:08SK to like
17:090.05 then Z2 forward and want to apply
17:13transforms in the geometry if you had
17:16any other hair you want to apply the
17:18modifiers on this one you don't really
17:20have anything and then in the Armature
17:22you want to select only de bones and
17:24don't add leavea bones and we don't have
17:26any animation so I can deselect this
17:27option then we can just press on export
17:31fbx and now we need to import the hair
17:34into Roblox studio so you select import
17:363D and then this is going to pop up
17:38after selecting the fight you need to
17:40make sure you have the hair and the
17:43Armature because if you don't have the
17:45Armature that means you either didn't
17:46apply it correctly or mess something up
17:48while exporting but then I don't need to
17:50upload this to Roblox so I can just
17:52press on import and I'm going to have
17:55the hair right here so let me just
17:57duplicate this dummy and let's give this
18:00guy a
18:03wig so it's going to have the hair like
18:05this now I'm going to put the hair model
18:07into the starter character then remove
18:09the initial poses and the animation
18:12controller and really quickly I'm going
18:14to weld the hair to the Head the part
18:16zero is going to be the hair and part
18:18one is going to be the head and you will
18:21see this connection appear then just
18:22disable the Collision on the hair and
18:25I'm fly going to show you how to set up
18:27the smart bone module so I'm going to
18:29leave links to everything in the
18:30description but once you are on the
18:32smart bone to death Forum post you want
18:35to press on the
18:37releases this will take you to the
18:39GitHub page when you will have these
18:41assets from the assets you can either
18:43download the demo play which is this
18:45place right here but I'm using an older
18:47version or you can download the smart
18:49bone 2 model and after you download it
18:52you want to right click on the
18:54replicated storage and press on insert
18:57from file then I'm going to select the
18:59Roblox model file and I'm going to have
19:02the smart bone module right here and
19:04then there is the script in the starter
19:05player this is the initialized script
19:08for the smart bone to run so you require
19:11the smart bone module and use the start
19:13method and that's it for the module
19:16itself but right now we need to apply
19:18the smart bone to this hair and the
19:20first thing we need to do is go to the
19:22tags in the properties you can also go
19:25to view and then tag editor and then
19:27from the tag editor you want to select
19:29the smart bone tag while having the mesh
19:31part selected like this you can see that
19:34it popped up right here in the
19:35properties but you can also just press
19:37on the plus icon and then just select
19:38smart bone and then down in the
19:41attributes we need to add an attribute
19:43called
19:45roots and it needs to be a string
19:48attribute and then after that we want to
19:51put in the name of every root bone we
19:53have in our case it chose this one which
19:56is going to be bone
19:59and that should be all for the smart
20:00bone to run so I'm going to put this
20:02starter character in the starter player
20:04and press on play and we have her
20:08physics but there is also a few
20:10different things that we need to do
20:11because you can see that it's kind of
20:12jiggly and this isn't properly behaving
20:14like
20:15ha and that's because we need to adjust
20:18settings and you have the documentation
20:20on the de Forum post right here too that
20:23after you open you need to go to the
20:24smart bone and scroll down to the
20:27attributes you have all of these
20:29different settings that you need to put
20:31in as attributes and you also need to
20:33make sure that they are the proper type
20:35for for example The Dumping if you
20:37wanted to change the dumping setting you
20:39would press on the Plus on the
20:41attributes and type in
20:45dumping and then just select a
20:47number and press on Save but a really
20:50neat thing that I have is the smart bone
20:53editor plugin that's going to adjust
20:56these settings manually you already put
20:58every single setting from the default
21:01preset but what I want to apply is this
21:04preset that I've made I just save this
21:06from this hair right here and I want to
21:08press on apply it's going to change all
21:11of these different settings and now a
21:13really important setting is the uncore
21:15dep the uncore depth determines how far
21:18down the karchy from the root bone the
21:20bones aren going to be physics simulated
21:23here in blender it was one because we
21:25don't want these bones to move but if
21:27for example it was two
21:29this one wouldn't move as well as this
21:31one wouldn't move also so we want to
21:33leave it at one then I can close the
21:36smart bone editor and just present how
21:39this hair is going to look with these
21:41curent
21:44settings it's going to behave more like
21:46an actual hair right
21:48now and this cylinder right here is a
21:50smart bone collider that if I jump on
21:53the hair is going to collide
21:57on there is also some different stuff
21:59going on with this Str of ha right here
22:01and that's because our head is set as a
22:03collider and it's kind of just getting
22:06stuck but at least it's not as broken as
22:08this one what I could for example also
22:12do is select all of these
22:15bones except these ones because these
22:17ones aren't going to be moving so I move
22:20the root bone and with the smartone edor
22:23plugin I could change their radius to be
22:26maybe on like 05 okay and this one
22:28doesn't want to change so I'm going to
22:30change it manually from the attributes
22:33and I'm going to just do a presentation
22:36also so yeah now it's a bit different
22:39but you can see that it's kind of still
22:41Cluny but overall the hair is working
22:43properly except just these side strains
22:45of hair and I also wanted to show
22:48because in my opinion you shouldn't be
22:50using smart bone 2 yet that's because
22:52this version is still kind of not ready
22:54for release it's in version 0.3 and
22:57there might be different bugs as well
22:58the skull module being kind of unstable
23:00at times for example with this hair you
23:02can see that it has basically the same
23:04attributes nothing really changed the
23:06karchy is also similar but yeah in my
23:09opinion you should be using smart bone
23:11one until the smart bone 2 version is
23:13ready and now I've put smart bone one
23:15into the replicated storage but you can
23:17see how it's going to be backwards
23:18compatible with the
23:20hair except a bad thing is that it's not
23:22going to really have any
23:26collisions but you can see how the hair
23:28is basically rigged and it's behaving
23:30like
23:34hair so yeah I made videos on both smart
23:37bone one and smart bone 2 so you can go
23:39and watch those but that's going to be
23:42basically everything for today so if you
23:43found this informative them pleas if a
23:45like it would really support my channel
23:47and if you want you can also become a
23:48channel member but yeah I hope you guys
23:50had a nice day and yeah

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