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Houdini Tutorial 05: Hexagon Particles — Transcript

by Caskal · 1,625 words · 335 segments · language en · Watch on YouTube

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0:00[Music]
0:09Hey guys, uh welcome to another Houdini
0:12tutorial. It's been a while, almost
0:15eight maybe nine years because I posted
0:18these ones
0:19on on Bimeo before.
0:24Um, but yeah, I'm going to we're going
0:27to create some hexagonal particles
0:31uh based
0:33on some R&D I did couple years
0:38[Music]
0:48ago. Heat. Heat.
0:55[Music]
1:00N. Heat. Heat. N.
1:07[Music]
1:35So,
1:37um the steps we are going to do in this
1:41tutorial is first we are going to create
1:43an external grid uh with some attribute
1:47transfer. From there we will create some
1:50simple particle simulation which will
1:53then drive some pyro simulation from
1:56these particles and then finally this
2:00pyroim will drive a grain simulation.
2:03That's basically
2:05um the steps on the tutorial.
2:09And this these are some renders of the
2:14result with some basic shading. Didn't
2:18spend too
2:20much.
2:23Um this is another one. I think on this
2:26one I inverted the the
2:29velocity and here was mixing some point
2:33deform along with the with the particle
2:36system. So yeah, let's dive into
2:39Houdini. So here's a new Houdini scene.
2:42I'm going to set my layout, my preferred
2:45layout by clicking here with
2:50the mouse wheel.
2:53And I'm going to create a
2:56geode and a
2:59circle. We will set this circle to CX
3:03plane with six subdivisions and open
3:08arc. And I'm going to rotate by
3:1330°. And now I'm going to create the
3:15pointer angle to create normals pointing
3:19out. So at n equals at
3:23p. If we check here we have
3:28this normals that we are now going to
3:30use as velocity. So at p equals at
3:35n and we can
3:38check probably will be hard to see but
3:42they are there. If
3:44we multiply by 10 you can see them.
3:50So next step we are going to create the
3:53grid. So we are going to duplicate.
3:56There are different ways to to do this.
3:59Uh but the this is the lazy one.
4:03So I'm going to create
4:05a
4:08duplicate and I'm going to translate one
4:13one4 with 20 copies.
4:18and another
4:21duplicate with two copies. And I'm going
4:23to set
4:25here
4:280.787 and minus
4:311.2. So we will have this and then we're
4:34going to
4:35create another
4:40duplicate with
4:443.02 and seven copies. So, we have
4:47this. They almost
4:51connect. And then I'm going to use a
4:53match
4:55size to put
4:58this match axis. Sorry.
5:08No match size. It was correct. So, we
5:11have this on the center on the scene of
5:13the scene. Now we're going to create
5:15a new
5:18camera and we are going to
5:22rotate minus 90 and 90. Let's
5:26see. So we have this
5:33and let's zoom in a
5:36bit. So now we have the the grid. Let's
5:40press L to
5:42organize. And let's put XA grid in
5:47here. So now we need to create
5:51the color transition that will be used
5:54as velocity after. So I'm going to use a
6:01blast and
6:04select
6:06130. And I'm going to put a color
6:11node. Set this to red. And I'm going to
6:15copy this one. And set this to
6:20blue. Now I'm going to use a transform
6:23node. This one in the isolated
6:27one. And we will set in frame 70.
6:33We will put this
6:35size at
6:3930. Center to
6:42origin. Click to create a key frame. And
6:45here we will set this to
6:47zero. So we will
6:49have this. And now I'm going to use a
6:54attribute transfer.
6:57We will
6:58transfer the
7:03color from this one to this
7:07one and in the con. So we will have
7:12this and we have to
7:14tweak the
7:17condition we will set zero here. frame
7:2245 we will
7:24set
7:264.5 and the
7:28blend. So we will have
7:33this. And
7:35now we will use an attribute promote to
7:39promote the
7:41color from
7:45point to primitive.
7:53And we will use a
7:56delete by
7:58expression at
8:01CD less
8:05than.5. And here I'm going to use a
8:09reample
8:11node. And we'll set this
8:13to 0.1. I think it's okay. So
8:24now we have more points for the normals
8:29and volume
8:31rasterize
8:34attributes
8:37and we will rasterize the V
8:44attribute 0.1 and 0.1
8:53one here I forgot to set attribute
8:59create
9:01sorry we'll create v attribute which is
9:06a vector and here we will also
9:11transfer the velocity. So now here we
9:14should
9:15have this velocity field. We can create
9:21a scatter scatter and a volume
9:25trail to see what is
9:28this sub points to trail
9:33velocities and we will have
9:38this. So let's put a null
9:42here and
9:45put out
9:48bell. So in this color we will
9:55put 3,00 we will create a new pop
10:01network and here we will set this
10:05to all
10:09points and pop back by
10:12volumes. We'll select
10:17the the velocity field we just created
10:20out
10:22bell. We will do this by force with a
10:25scale of
10:28two. And here on the birth we will put
10:32at
10:33f less than
10:3530. And we will create the pop color.
10:39Set this to ramp by
10:43age. And let's do something like
10:56this. Maybe set the scatter here
11:00to 30,000.
11:10So here I change uh few things. Uh on
11:15this point wrangle I multiply the
11:17velocity
11:19uh for two
11:23and then I change this transform that
11:27before we put center to origin.
11:31I just set this
11:34to as it was
11:36originally. So now we will
11:40have this. And if we go to the
11:44popnet, we will
11:50see these
11:55particles. And now we're going to create
11:58the wrangle. And we are going to
12:02say at
12:04B
12:08Y equals
12:10at
12:12CD X by
12:160.4 and we will get a bit
12:20of instead of flat a bit of depth on
12:26this. And now we're going to use this on
12:29a
12:30pyroim. So let's create a time
12:36shift. Going to set this as dollar ff
12:39minus
12:438.
12:45And a ripple node. I think this is from
12:50axis tools, but
12:52uh you can get like the normal ripple to
12:55create the same stuff.
12:58I'm going to use these parameters 4
13:0261
13:043.58 and on the hat I'm doing a
13:08animation from zero and in frame
13:1215 one one.2
13:152 and wave
13:19decay.14 speed two ripples three. So we
13:23will have this going
13:28on. And now I'm going to
13:30create pyrus a billowy smoke.
13:44I'm going to delete
13:49this and I'm going to use
13:54this source going to put here keep
13:59input
14:01and now we are going to use a attribute
14:04transfer to transfer the
14:06velocity from this
14:12popnet velocity
14:15And I'm going to bypass
14:19this. And here we are going to
14:24set
14:3104. No
14:370405
14:39maybe. And on the pyro, we are going to
14:43set the boxer size
14:47to
14:4905. And I'm going to put the velocity to
14:55copy
14:57and dissipation is okay. No buoyancy, no
15:04wind. And let's see.
15:14And we will have this pyroim which we
15:17will use on a
15:18grains to
15:27affect. So I'm going to take this and
15:30create a
15:32bound with 3 and 7 to create
15:38this. And I'm going to create a grain
15:43source. We can leave this at
15:49points not uniform
15:53values. Oh no, it's
15:58create
15:59uh veum
16:06grains. We can copy this particle
16:12separation. And now I'm going to put the
16:16time shift
16:17here. Frame
16:20one and the pop network.
16:26Let's put this a
16:28new set it to
16:31black out
16:34pyro. I'm going to copy this and came
16:39here. Let's put this to all
16:43points dollar f equals
16:481. And I'm going to use a pop at back by
16:51volumes again. This time set to
16:54velocity. I'm going to copy the
16:57pyro and let's use
17:00a pop color with a
17:04ramp from
17:11speed. So now we will have
17:16something like this.
17:24I'm going to create a
17:29cache. So, I'm going to set this to
17:340.5. And here we'll use an
17:37attribute
17:39delete. We're going to set
17:43color
17:45velocity age.
17:49Maybe ID and P
17:54scale and delete non
18:02selector. So let's put
18:07cache and let's put
18:10here exa tutorial.
18:14Okay. And let's
18:18make 75 frames.
18:27So now I have this
18:31cache and I'm going to use a attribute
18:35that's just color. This cames with the
18:39side effect
18:40labs and I'm going to set this to Y
18:43compute
18:45range. And now we will
18:48have this simulation.
18:52So you can use a red time three time
18:56node here if you want. You can slow
18:59down. Um I'm going to do like a super
19:03quick shading of this. So let's go back.
19:07Set this to
19:11particles. Let's put here particles.
19:14Render as
19:15particles 2 maybe.
19:18And I'm going to create the red shift
19:22light
19:23dome. I'm going to select an HDR in
19:28here. I'm going to take the
19:31[Music]
19:32saturation and the background.
19:36And I'm going to
19:41create I'm going to go
19:44to
19:46material red shift material
19:51builder red shift color user
19:54data and we will
19:58use a material
20:03blender red shift
20:07ramp. And here, let's see super quickly.
20:12Let's create this as
20:15gold, this
20:17as
20:21silver. So now you should have something
20:23like this. I set the scale to
20:2765. And here I set this
20:31ramp that you
20:37can
20:40modify. Uh use a basic lid and gold. You
20:45can set this to
20:47aluminum or whatever works or set your
20:51own materials. Want to do
20:54something quick?
20:56Um, and that's
21:00basically for this one.
21:28So
21:29yeah, let me know in the comments if you
21:31have any other ideas for tutorials. You
21:35can check on my
21:36Instagram. I have different uh making
21:40offs.
21:43[Music]
21:44These were some procedural robots that I
21:47did uh last year.
21:52Uh that was another idea for the
21:55tutorials
21:58or you can see some particles R&D. Uh
22:03whatever you you feel you would like for
22:05the next one. And yeah, that's it

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