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0:01Let's learn how to optimize your heavy
0:03geometry scene inside of mash using the
0:06mash instancer. Let's quickly get into
0:08it. All right, let's start by
0:09understanding why this switch mash
0:12geometry type exist at all. So, I'm
0:14going to start off by taking a cube just
0:16so we understand how this works and
0:18let's create a mash network of this and
0:21I'm going to keep it to
0:23grid and let's keep it like this.
0:26And if I go to my mash and utilities and
0:29here we have switch mash type uh
0:32geometry type and if I go to my outliner
0:34here you can see we have currently a
0:36repro.
0:37And if I switch this real quickly to the
0:41it will ask me to select my waiter. I'm
0:42going to select my waiter and switch
0:44again and you will notice that it
0:45instantly switches from a repro to an
0:48instancer.
0:49So, the question is what is the
0:52difference between a repro and a
0:54instancer? Why does this exist at all?
0:57So, what this node basically does is
1:00it's an utility node and it converts
1:02your mash network between a instancer
1:04mode or a repro mode. You can switch uh
1:07back and forth anytime you want. Uh
1:09that's the best part of this utility
1:11node.
1:12But, the main question is why this exist
1:14at all? Mash is a procedural network
1:17which works [music] on points. These
1:19points uh can be represented either as a
1:22repro or instancer. The difference
1:24between a instancer and a repro is
1:26instancer treats your object main object
1:29>> [music]
1:30>> uh as a ghost. It creates more ghost of
1:32it which is basically you can consider
1:34like a shell which doesn't really have
1:37um original property. It just have like
1:39a shell property
1:41which can be consisted of translate,
1:43rotation, scale and so [music] on.
1:45Um the uses of instances uh is it's very
1:49fast. It's memory efficient, ideal for
1:52massive counts, thousands, millions. You
1:54can scatter grass, debris, crowd.
1:56[music]
1:57Uh although there are some cons, there
1:59are some issues that it's limited per
2:02object control. And you cannot like use
2:06>> [music]
2:06>> some of the features inside of mash like
2:08for example, if you try to use a color
2:10node inside of mash that will not work.
2:12If you use trying to use certain
2:14deformation, that will not work either.
2:16And sometimes it's a bit tricky and
2:18harder to convert into an editable
2:20geometry depending upon how complex your
2:23scene is.
2:24On the other hand, repro is basically
2:27your real geometry. So, when you create
2:29an instances of your any object, it's
2:32basically creating real geometry of that
2:34object. More copies of it. And uh
2:38the good and bad thing, well, first
2:41thing it's heavier obviously because
2:43it's creating an original geometry again
2:45and again. So, it's heavier but more
2:46flexible also. It allows the deformers
2:50per vertex uh effects, shading
2:52variation, better compatibility with
2:54rendering workflows at least I've
2:56noticed.
2:57And it's easier to bake to a real object
3:00in the end if you feel like it.
3:02Uh as I said, the best part is you we
3:04can always switch back and forth. So, my
3:07idea here whenever we are working with
3:09mash and since I use mash a lot to
3:12create multiple instances especially
3:15when I have a environment scene on a
3:17terrain I'm trying to create like small
3:19grass and bushes, I always start with
3:21the instancer because it's faster
3:23iteration. I can always go back and
3:25forth which I will show you
3:27in a while. And then when I'm getting
3:30closer to the end, I usually switch back
3:32to the repro and then I can finally do
3:35my final look dev and everything.
3:37So, this is basically pros and cons of
3:40using instancer and repro. Uh as I said,
3:43this is the best tip. Start with the
3:45instancer and with the repro. All right,
3:47so let's try to create something out of
3:49it. Uh I have some basic models here
3:51which are meant to look more like a hard
3:53surface
3:55uh which we are going to use for this
3:56purpose and I have another scene geo
3:58which is basically one floor
4:01and one cube to look something like
4:03this.
4:04And that's pretty much it. So, the first
4:06thing I'm going to do is I'm going to
4:08create some clones of this. Let me add a
4:10color node just so we can see
4:12better.
4:14And what I'm going to do is switch to
4:16grid and maybe like 150 150.
4:24Something like this. Maybe add four.
4:29And there we have it. So, I'm going to
4:31keep it to something like this.
4:33And let's turn this off. I can call this
4:36just grid.
4:38And the first thing is so we have around
4:41eight polygons here our hard surface
4:44models which you want to use.
4:46And there are a couple of ways of doing
4:47this. Uh I'm going to show you all the
4:49way.
4:50Um but the first thing is obviously the
4:52most easiest one. You can just click on
4:54your network and you can create uh your
4:56mash network and with your group
4:58selected but usually it's better to do
5:01with your polygon selected and you can
5:02click on mash.
5:04And after clicking on your mash, you
5:05will have just one object registered in
5:08uh but in your repro if you look, you
5:10have like eight different objects here.
5:12Now, let's talk about repro first. Uh
5:14so, here you will notice it creates a
5:16repro mesh which is as I mentioned
5:18before that it's creating an actual mesh
5:20of your geometry. It's not creating like
5:22a shell or a instancer. That's why it's
5:25more heavier.
5:26Now, there is a lot of different ways of
5:28optimizing your um repro as well. You
5:31can change the level of details to
5:33bounding box which will treat it as a
5:35bounding box which will be easier to
5:36maintain and you can also use your GPU.
5:39In the renderer, you will still see your
5:41final mesh but just for the view port uh
5:43stability, you can switch to bounding
5:45box. I'm going to keep it to geometry
5:46for now.
5:47And um
5:49right now it's treating one object. So,
5:51what we want to do is we want to create
5:53a ID node.
5:54And inside of our ID it uh automatically
5:57recognizes it. You can change to random,
5:59linear, whatever you like.
6:01Uh but what I want to show you is so in
6:04the distribute, what I'm going to do is
6:05switch to mesh.
6:07And since
6:08if you look at the face, we have a lot
6:10of faces on this object and I'm going to
6:14switch the scattering mode to face
6:16center and see how much time it takes
6:18just to register all of this mesh. So,
6:20let's quickly go here and I'm going to
6:22take the grid and I'm going to use the
6:25face center. All right, so we have the
6:28face center here.
6:29Uh the orientation is all messed up. So,
6:32I'm going to turn this off. But, the
6:34main thing that I'm going to do now is
6:36basically I'm going to click on flood
6:37mesh and it's going to flood all of the
6:40mesh like all the face center of the
6:41mesh we have.
6:43So, let's click here.
6:45And uh it actually handled quite great.
6:49I'm not that disappointed but sooner
6:51with time uh it's going to slow down
6:53anyways.
6:54So, what I can do from this point is I
6:57can start working around with it, you
6:59know. And as I said, you can also have a
7:02bounding box just if you want to use.
7:05Um but first, I want to
7:09do something. I'm going to remove the
7:12randomization of this but I think I'm
7:15going to
7:20just
7:21the scale volume.
7:23And let me just take a offset node
7:26first.
7:27I'm going to use the scale volume to
7:290.5.
7:32And uh yeah, this uh looks decent
7:36enough. Let me just
7:39click on random.
7:41And in the distribute
7:45I don't think I want to change anything
7:47here
7:49apart from
7:51I think we are good to go.
7:55I think I would do want to change the
7:57scale a bit.
8:000.5 maybe something like this.
8:05And maybe what I can also do is
8:08uh in the offset, I can just create a
8:11negative one
8:14completely and let's go for a
8:180.5.
8:20And uh
8:23yeah, I think this will do the job for
8:25now.
8:26Um anyway, so we have a scene like this
8:29and let's say I want to increase a bit
8:30more. So, I want to I'm going to try to
8:33make this scene more heavier.
8:35So, I will go to my mash uh one and here
8:38in distribute, what I'm going to do is
8:40I'm going to add maybe like five.
8:43So, we have uh more clones here. I will
8:47make it six and I will increase the
8:50distance to let's say 300 and we have
8:53something like this.
8:55Um now, what I'm going to do is you can
8:58go back to mash two and you will no
9:01notice that we have um eight different
9:03objects. What I want to do is I want to
9:05switch this repro. So, I can just go to
9:07my repro mesh here
9:09and switch to effects mash utility and
9:12you can uh click on switch mash geometry
9:15type.
9:16And it will ask me to select the waiter.
9:19So, selecting the waiter and here you
9:21will notice that we have all the
9:23instances uh
9:24created
9:26which is
9:27uh quite good.
9:29And from here, I can just start playing
9:31around with my object uh whatever I want
9:33to do and everything. But, what I also
9:37want to create is
9:39um I want to add some more objects here.
9:42Let's say we have this many objects
9:44which I don't want or no longer need. I
9:46can just click on remove um items and I
9:49can get rid of them. And let's say I
9:52want to add like a sphere. I want to add
9:55like a cube.
9:57And let's give this and I can select
10:00both of them and I can click on my
10:02instancer and I can click on add
10:04selection. And here you will notice that
10:07we have both the object present. Now you
10:09won't see them here in the mesh network
10:12obviously.
10:13The main reason being
10:15I'm going to hide this. I'm going to
10:17hide this. I'm going to go back to my
10:20mash.
10:22And in the ID I'm going to increase the
10:25two ID which
10:27and the two ID we added.
10:30And here we have it. So we can see, let
10:33me just take this.
10:36Reduce this.
10:39And so on.
10:40And you will see some sort of
10:43artifact
10:45which I'm seeing right now.
10:48But that is just because of this. Let me
10:50hide this and there you have it.
10:53So we have something like this. If you
10:55want to add more objects, you can always
10:57take more primitives. And when you feel
10:59like you don't want any object, you can
11:01just remove the item. Or you can also
11:03change how the objects are being
11:06instanced. You can change their order.
11:09And it will reflect on your geometry
11:12just like that.
11:13And on top of that, you can also click
11:17on display percentage. So let's say you
11:20want to you're doing a look dev or
11:21lighting and you want to only use half
11:23of it, you can click on display
11:25percentage and you can
11:27sort of use this to create your geometry
11:32like a sort of like animation.
11:34You can use a bounding boxes here as
11:37well.
11:38If you want and you can use geometry as
11:42well. And whenever you feel like you
11:44want to switch back, you can just click
11:46on your instancer. You can go back and
11:49oh
11:52It's the waiter. Yeah. And we come back
11:55here and we have our repro back again.
12:00One more interesting thing that you
12:02should know is when you have your
12:05instancer going on, you can also bake
12:07it. Let's say you want to create object.
12:08You're happy with the scene and you want
12:10to move to look dev. You don't want to
12:12create a repro because you don't want
12:14any proceduralness anymore. You just
12:17want to get it done or you want like a
12:19certain control on certain section of
12:21your
12:22mash. So what you can do is you can just
12:24go to mash here utility and you can
12:25click on bake instancer to object.
12:29Again, the waiter. Scheiße.
12:31Let me go back.
12:35And click here.
12:40What is
12:43Yeah, there you go.
12:45After several tries.
12:47So your bake instancer tool will open
12:49up. Here you will see checking for
12:51common problems. You will see this
12:53pretty much every time you open this up.
12:56Now a couple of things to know here.
12:59If you are going to click on bake
13:00animation, let's say you have a signal
13:02node or something like that and you have
13:04trails and all of that and you want to
13:05bake it on your polygon to be a final
13:07mesh.
13:08Be very careful what you're selecting
13:10from here because as I've already
13:12mentioned in my catch mash catch video
13:16that every time you catch a mash
13:18network, it basically catches the
13:20translate first.
13:22And after catching that, it catches
13:24rotate. So it's going to catch several
13:27times and it's going to take a lot of
13:29memory and time. So if you don't have
13:31any rotation in your mash network, if
13:33you don't have any scaling or animation,
13:35just don't use it. Just don't bake it at
13:38all.
13:39But what you want to do is like for
13:42example, what I want to do is my bake to
13:44shape instances and I can just click on
13:47bake this frame.
13:48And just wait a minute. Don't do
13:50anything and it will just start baking
13:53all of these instances into an actual
13:56object. All right, so the baking is
13:58done. Let's close this down. Also, you
14:01can clear undo and close script editor
14:03if you're using. You can check this up
14:05just to save some memory.
14:06So here you will see it creates this
14:09group and you can pretty much select any
14:13object you want and you can move it up.
14:16You can change the scale of it. So
14:19um
14:20if you want to just work with one
14:22particular object, you can do that. So
14:25you have all these instances baked into
14:28a real mesh which is now ready to go.
14:31You can just start working with it.
14:34So this is another tip that you can do
14:37when you're working for your final piece
14:40that you can also bake your instances to
14:43a real object if you like.
14:45So both have their pros and cons. It's
14:48just depends on your workflow, what
14:50you're working with. As I've said,
14:52always start with the instancer and then
14:53switch to the repro when you want to
14:57do your final look dev or whatever
14:59because one thing you've noticed is if I
15:01go to the mash network, you will notice
15:03that the color node is not active. It's
15:05completely grayed out because you cannot
15:07use this with instancer. You need to
15:09have a mash network like a mash repro.
15:13An actual geometry to work with. So
15:15there are some limitations with it, but
15:17if you're not planning to use some of
15:19those limitation, then go with it. So I
15:21think that's a very good thing and the
15:24bonus point is obviously that you can
15:26always switch back and forth. So yeah.
15:29So that's was pretty much it. I hope you
15:32got something out of this.
15:34Good information
15:36or what not and yeah, start creating
15:39some interesting stuff and I'll see you
15:41in the next video.

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