YT YouTube2Text

YouTube2Text → Transcripts → Blender 3DCG Tutorial - Rigid Body Physics for Beginners

Blender 3DCG Tutorial - Rigid Body Physics for Beginners — Transcript

by Kawaken 3DCG · 3,403 words · 565 segments · language en · Watch on YouTube

Open in transcriber Summarize with AI Download SRT/VTT

Full transcript

0:00In this video, I'll show you how I
0:02created these kinds of satisfying 3D
0:04satisfying animations. All of these
0:06videos have been viewed over 10 million
0:08views and they are mainly created using
0:10a free CC software called Blender. My
0:13content is mainly created using the
0:15physics simulation features. Rigid body
0:17simulation, soft body simulation, cloth
0:20simulation, fluid simulation, hair
0:23particle simulation and force fields.
0:26These are the physics simulation
0:27features most commonly used in Blender.
0:30And in this video, I'll explain one of
0:32the most basic features, rigid body
0:34simulation, [music] in a way that's easy
0:36for complete Blender beginners to
0:37understand. If there are enough
0:39requests, I'm planning to make a series
0:41of this Blender physics simulations and
0:43explain other simulation features as
0:45well. So, if there's a specific video
0:48you'd like me to explain, please feel
0:50free to leave a comment. Also, I've
0:52uploaded my complete Blender project
0:54files on a site called Gumroad. So, if
0:57you're interested after watching this
0:59tutorial, feel free to check them out
1:01through the link in the description.
1:03Okay, let's begin. You can install
1:05Blender from the link in the
1:07description, so please download it
1:08beforehand. When you open Blender, this
1:11is the first screen you'll see. This
1:13animation I made includes a very heavy
1:16process for your PC, so I'll explain it
1:18later as an advanced tutorial. So, first
1:21I'll just start by explaining the basic
1:23features of rigid body. If you're not a
1:25beginner and want to jump straight to
1:27the advanced section, please skip to
1:28this timestamp. Also, I'll display
1:31screen cast keys in the bottom left
1:32corner right over here. So, this will
1:35let you see which buttons and mouse
1:36action I'm using. So, I'm going to start
1:39with selecting these default stuff and
1:42delete all of them and there's nothing
1:44in my Blender area.
1:46So, let's press shift A and add a plane
1:49object. This is going to act like a
1:52ground.
1:53Press S key.
1:55This is for scaling this stuff. I want
1:58to press number pad 10.
2:01And this makes this stuff 10 times
2:03bigger.
2:04And I want to add a cube again with
2:07shift A and select this cube.
2:10And I want to move this upwards. So,
2:13press G to select the cube and move. And
2:17I want to just move this as an Z axis.
2:21So, press Z and it's going to be moving
2:24only in the Z axis.
2:26And I'm going to put the cube around
2:28here. Next, I want to add a physics in
2:31this cube. So, press physics tabs right
2:33over here and select rigid body. This
2:36one.
2:38And this space is the animation timeline
2:40on Blender. And if you press the space
2:42bar, the animation will start and cube
2:44is falling. But, it's going through the
2:46ground object. So, I want to also add
2:49the rigid body to this ground. And let's
2:51start the animation again.
2:53Oh my god. The ground and cube is
2:56falling together. So, what I have to do
2:58is select the ground and change the type
3:00to passive.
3:02This allows the ground object to stay
3:04still during the animation, but just
3:06react as a rigid body. So, if you press
3:10space bar again, the ground catches the
3:12cube. Very nice.
3:14So, let's try with another object.
3:17Delete the cube and let's add
3:21a cone.
3:22And I want to place this perfectly on
3:25the ground. So, let's press number pad
3:27one key to view it from directly in
3:30front. So, press G key and Z key to move
3:34it only on the Z axis. And if you hold
3:36the control key like this and move the
3:38mouse, the object snaps neatly to the
3:41grid like this. So, put it right over
3:44here
3:46and it perfectly landed on the ground.
3:48So, let's add a torus object like this
3:52and press G key, Z key and move it
3:55upwards.
3:57And let's add rigid body to both of
3:59them.
4:01And if you hit the space bar,
4:04you'll see it's acting weird like this.
4:08What's affecting this is the collision
4:10type shape.
4:12The shape type in the collision settings
4:14determines what shape the object behaves
4:16as during the rigid body simulation.
4:20So, if you select sphere,
4:23it acts like a sphere.
4:26And if you select cylinder,
4:29it acts like a cylinder.
4:32So, what is convex hull?
4:34In Blender, convex hull is a feature
4:37that automatically creates the smallest
4:39convex shape enclosing the selected
4:41object of vertices. It's easy to imagine
4:44the entire surface of the object being
4:47wrapped in a hard plastic film.
4:49If you wrap this donut in a film, the
4:53hole gets filled in like this.
4:58So, if you start the animation wrapped
5:00in a convex hull,
5:03it behaves like this.
5:06So, if you want it to behave as a
5:08perfectly accurate shape, select the
5:10shape type to mesh. And finally, it acts
5:14like a perfect donut.
5:16However, mesh mode is a little bit heavy
5:18on your PC, so use it carefully.
5:21On the other hand, convex hull is a very
5:24lightweight making it suitable for
5:26physics simulations with simple shapes.
5:28So, use it flexibly depending on your
5:30situation. All right, these are the
5:33basic and main functions of rigid body
5:35simulation. And by combining and
5:37applying the techniques I just
5:39explained, we can create that cube tower
5:41animation. So, let's jump in and try it.
5:44However, if you try running the
5:46simulation with this bunch of cubes
5:48right away, it will likely become
5:50extremely heavy unless you have a fairly
5:52powerful computer. Just for a reference,
5:55I'll briefly show you my PC specs.
5:58Anyway, in this video, we'll start with
6:00a small number of cubes first. So,
6:03please adjust the amount depending on
6:04your PC's performance as you go. So, I'm
6:07going to start with creating a ground
6:09again. So, press shift A and create a
6:11plane. And this time, let's scale it to
6:15number pad 15 and make it 15 times
6:19bigger. And let's start creating a cube
6:22tower first. So, press A and create a
6:24cube. And this time, let's scale it to
6:300.25.
6:33And I want to put this right on the
6:36ground. So, you can insert the number
6:40to this object info.
6:43If you enter 0.25 in the Z location, it
6:47will slightly land on the ground.
6:51And this is the important part. Watch
6:53the object info. The scale is 0.25 right
6:57now. So, what I want to do is press
6:59control A and apply the scale.
7:03In Blender, applying scale resets the
7:06object size to one. This prevent issues
7:09with physics calculations.
7:12So, I want to increase this cube by
7:15adding a modifier
7:17right here
7:19and search for array.
7:23This one.
7:24All right, look at this. Since the cubes
7:26are perfectly attached to each other, so
7:29it's hard to tell that there are
7:30actually three cubes on here. So, press
7:34Z key and select this wireframe mode.
7:37Now, you can clearly see that there are
7:39three cubes. And then press Z key again
7:42to return to solid mode. Since it's
7:44still a bit hard to see in solid mode,
7:47so let's add a slight bevel to the edges
7:50of the cubes. Press tab key to change to
7:53edit mode.
7:54Or you can just select here.
7:57And press control B to bevel these
8:01edges.
8:02Just a little bit
8:04edges like this.
8:07Now you can see there are clearly three
8:09cubes right here.
8:10So I want to increase the number. So
8:12let's change the count to, let's see, to
8:1510.
8:17And also I want to add a cube in the Y
8:20direction. So let's duplicate this array
8:22modifier.
8:27And I want to change the X offset to
8:29zero.
8:31And Y to one.
8:33So there are now 100 cubes right here.
8:36So I want to increase
8:38also to the Z axis. So duplicate this
8:41again.
8:43And
8:44change the offset Y to zero and offset Z
8:48to one.
8:50And I want to increase the height of the
8:52Z axis. So let's change the count to
8:56like 20.
8:58Okay, the cube tower is complete. Let's
9:00place this into the middle center of the
9:02world. So press number pad seven to see
9:05it from above.
9:07And change it to wireframe.
9:10And press G key and move it like this.
9:14Let's zoom in and press G key.
9:18I'm pressing control shift to slightly
9:21move it to the center.
9:24Okay.
9:25Perfect.
9:27At this point, Blender still recognize
9:30this object as a single cube. That's
9:32because modifiers only change the object
9:35visually.
9:36They don't actually change the
9:38underlying geometry yet.
9:40So, what I want to do is apply this
9:43array modifier by pressing here or just
9:46press control A to apply them.
9:50And now Blender recognize all the cubes.
9:52Also in the edit mode,
9:55I want to push mesh over here
9:59and separate it by loose parts.
10:03Now we can see the cube layer here
10:06all the way down to 2,000 cubes.
10:11And one more thing,
10:12in the object mode, press object and set
10:16origin to geometry.
10:19This moves the origin point to the
10:21center of each cube. This is also a very
10:24important step when working with physics
10:27calculation later on.
10:29And we won't add a rigid body physics
10:31yet in this cube since it's a very heavy
10:34process. So,
10:36for now, let's save the project here.
10:39Press control S to
10:41save this project file. You can create a
10:44new folder and rename it like rigid body
10:47test and save the Blender file inside
10:50this folder and rename it like rigid
10:52body test
10:55and save the Blender file. Next, let's
10:57make a slider and a metal ball. So,
11:00press shift A and add a cube again
11:03and numpad 3 to switch to the side view.
11:07And this time let's scale this cube to
11:102.5.
11:13And press G key to move it right towards
11:16here, control shift key and
11:20put it neatly right here.
11:24Next, I want to add a loop cut over here
11:27and over here. So, change it to edit
11:30mode and press control R to add a loop
11:34cut here.
11:35Left click and move it right here.
11:40And I want to also add a loop cut right
11:42here. So, press control R again and left
11:46click and move it down over here.
11:51And next, [music]
11:52make sure the selection mode is set to
11:55edge.
11:56Or, you can press two to switch to edge
11:59mode.
12:01And select this edge and go back to the
12:03side view and move the edge like over
12:07here.
12:10And press control B and create a bevel
12:14like this.
12:16And drag the middle wheel of the mouse
12:19and subdivide these bevels.
12:23And left click to confirm.
12:27And now go back to the object mode.
12:30I want to erase these edge-looking
12:32sliders. So, right click and shade auto
12:35smooth.
12:38Also, I want to add a bevel here. So,
12:40this time let's
12:42use the modifier. Enter bevel.
12:46And I want to increase the segments to
12:49five.
12:50And here's the nice-looking slider.
12:54Let's raise the slider a little bit
12:56higher.
12:57So, go back to the side view and select
13:00these edges, just these edges, and move
13:04it to the Z axis. Let's see. Let's move
13:09it like over here.
13:11All right.
13:14So, next, I want to make a metal ball.
13:17So, shift A and this time let's create
13:20this icosphere.
13:23And I want to increase the subdivisions
13:26to four.
13:29and move it up like this.
13:33And replace the cube over here.
13:37Maybe a bit more higher.
13:40And add shade smooth to make the surface
13:42look smoother. Oh, I forgot it. Don't
13:45forget to apply the scale of the slider
13:48with pressing control A
13:50and apply the scale.
13:53To make things more exciting, let's set
13:55up the final camera angle and add some
13:57materials so we can view that screen
13:59while working.
14:01First, add a camera with shift A
14:05and split the view selecting here
14:08and move it like here.
14:12I want this panel to match the same
14:14framing as the final rendered video. On
14:17this panel,
14:18click view to align active camera to
14:22view.
14:23By default, it's set to a horizontal
14:26layout, so let's switch it to a vertical
14:28format.
14:30Select the output properties and change
14:33the resolution X to 1080 and resolution
14:37Y to 1920.
14:39This is for the smartphone vertical
14:41format
14:42>> [music]
14:42>> and change this panel to material
14:44preview.
14:45And we'll continue working with this
14:47panel.
14:49And I want to add some nice background,
14:51so select the plane object and switch it
14:54to edit mode, select this edge and press
14:57E key and Z key to extrude the edge to
15:01the Z axis like this.
15:04Next, select this edge
15:07and control B to bevel this again
15:10like this.
15:12And don't forget to shade smooth.
15:16Okay, let's change the camera view.
15:20On this panel, press N key and select
15:23the view panel and click this checkbox
15:26camera to view.
15:29This makes the current view align with
15:31the camera view.
15:33So, adjust it to
15:36nice looking position like this.
15:40Okay, good.
15:41The background isn't wide enough, so
15:43let's scale it along the X axis. Press S
15:47key and X key.
15:49Number pad three to scale it three times
15:52than the original.
15:54Okay, don't forget to unselect the
15:56camera to view.
16:00So, now even if you move the view, the
16:02camera will remain fixed over here.
16:07If you press the number pad zero key,
16:09you can go back to the camera view.
16:12Let's just adjust the view port display
16:15and move this pass part out alpha to
16:18one, so you can only see the camera
16:20view.
16:22Okay, let's add the materials to these
16:24objects. So, first you select the slider
16:27and go to this material properties.
16:32Add a new material and rename it like a
16:35slider.
16:37And you can change the base color right
16:39here. So, let's let's select a nice blue
16:43color. You can see the material is
16:45changing on this view and let's decrease
16:48the roughness to 0.2
16:52and go back down to the transmission
16:55and increase the weight to one.
16:58This parameter changes the slider looks
17:00kind of like a glass material.
17:03So, let's also add a metal material to
17:05the sphere.
17:06Add a new one and rename it to metal.
17:11And this time, let's increase this
17:13metallic
17:15parameter and change the roughness to
17:190.1
17:21maybe.
17:22Here's the nice looking metal ball.
17:24Change the base color little bit darker.
17:27And next change the background color.
17:30Add a new one and rename it like BG.
17:34I want to make this a black looking
17:37background.
17:39And finally, let's add the cube
17:41material.
17:42Rename it to cube.
17:44And let's change the base color to
17:46something like yellow orange thing.
17:50And I want to apply this cube material
17:53to all of these 2,000 cube towers. So,
17:56change it to wireframe mode and from the
17:58side view, first select the material
18:01changed object and then select all of
18:05these 2,000 cubes with the wireframe
18:08mode. Press control L key and select
18:12this link materials so that the all cube
18:15towers change it to the orange color.
18:18So, let's make the scene look a bit
18:20closer to the final render result.
18:23By pressing here render, turn the render
18:26engine to cycles.
18:28And if your computer have a GPU, select
18:31the device to GPU compute.
18:34And don't forget to turn on the graphic
18:36board checkbox in the system menu of the
18:39preferences.
18:41And maybe change the max samples to I
18:45change it oftenly changes to 256.
18:49This makes the render a little bit
18:51lighter. Okay, then change this panel to
18:55the rendered view.
18:57And you'll notice that the scene is too
19:00dark.
19:01That's because I don't have any light in
19:04this Blender scene. So, I want to add a
19:06light environment in this Blender scene.
19:08>> [music]
19:09>> So, go on to this world panel and select
19:13this color button and let's try using
19:15the sky texture that comes built into
19:18Blender.
19:19And now you can see the final result
19:21view in this panel.
19:23It's still a bit too dark, so let's add
19:26our own light as well. By pressing shift
19:29A, let's select an area light here.
19:34So, move it up with this G key and place
19:38it like over here. And click this yellow
19:40circle button to change direction of the
19:44light. So, I want to light up the cube
19:46tower,
19:47but the light doesn't have enough power.
19:49So, let's press this light bulb panel
19:53and change the power to like 5,000.
19:57Maybe 10,000 is better.
20:00Move it up, adjust the light direction a
20:03little bit,
20:04and that looks better.
20:06Okay, now it's finally time to apply the
20:08physics simulation. From this point on,
20:11there will be a lot of heavy processing,
20:13so make sure to save your project
20:15frequently by pressing control S. I hope
20:19your Blender won't crash.
20:21So, let's add the background a passive
20:24rigid body effect and don't forget to
20:26change the shape type to mesh.
20:30And also I want to add a rigid body type
20:33passive to the slider.
20:35Change the shape type to mesh.
20:38And also I want to add a rigid body to
20:41this metal ball, but this time type
20:43active.
20:44And maybe changing the shape type to
20:46sphere will be nice.
20:48And finally, let's add a rigid body to
20:52all of these 2,000 cubes. So, select one
20:55of the cube
20:56and add a rigid body and the type of
20:59course is active and the shape type
21:01maybe the box will be nice.
21:05And let's change the settings of this
21:07dynamics menu
21:09over here
21:11and check this deactivation checkbox and
21:15start deactivated.
21:18This makes the cube start reacting
21:20physically at the exact moment the metal
21:22ball hits them.
21:23And after selecting rigid body applied
21:27cube, select all of these 2,000 cubes
21:32with the wireframe mode.
21:34And on the object tab, select rigid body
21:38and copy from active.
21:41And now we have rigid body applied to
21:43all of these 2,000 cubes.
21:46And also uncheck this show overlays and
21:50hide unnecessary elements like the
21:52lights and grid from this panel.
21:55And don't forget to save the Blender
21:57file before you start the animation and
21:59let's press space key to start the
22:02animation.
22:07Maybe the metal ball wasn't heavy
22:08enough, so the cube tower probably
22:11didn't collapse very much. So let's
22:12change the metal ball weight.
22:15On the physics tabs, change this mass to
22:18like 1,000 kg
22:21and press space again to start the
22:24simulation.
22:26And now you can see the block tower
22:28collapse.
22:33Okay, this is very satisfying and
22:35exciting.
22:37Let's change the cube color a little bit
22:39darker.
22:43And maybe adding more light power.
22:51Yeah, I think it looks better.
22:55And finally, I want to render this as a
22:57movie file.
22:59So press this output tab.
23:03Go back down to this output menu and you
23:06can change the directory wherever you
23:08want to output the video file and change
23:11the media type to video.
23:14And now I recommend to change the
23:15container to MPEG-4.
23:17I think the MP4 file is easy to handle
23:20it. And maybe changing the render
23:22properties to make it more visualized.
23:25>> [music]
23:25>> Inside this color management menu, I
23:28recommend to change the look to medium
23:31high contrast or high contrast,
23:34whichever you prefer. I personally like
23:36the high contrast movie because it looks
23:38very nice.
23:40Let's render the final results. So,
23:42press render and render animation.
23:45And now the render starts. It will take
23:48time depending on your PC spec.
23:51Let's wait for a while.
23:52So, the rendering is done and this is
23:55the final rendered video. It took around
23:5840 or 50 minutes on my PC. So, I hope
24:02your PC hasn't exploded.
24:05Okay, that's it for this tutorial. Try
24:08changing the size and weight of the
24:09metal ball and experiment with different
24:11settings. Since this tutorial was aimed
24:14at beginners, I simplified a lot of
24:16things such as the number of cubes and
24:19the materials. However, as I mentioned
24:21at the beginning, I've uploaded the
24:23actual Blender project files from my
24:25videos to Gumroad. So, be sure to check
24:28them out. I also get a lot of questions
24:31about how I add sound effects to my
24:33videos. So, if this video gets a good
24:35response, I'll make a tutorial video
24:38about sound design as well. Please leave
24:40a like, comment, and subscribe to the
24:42channel. See you again.

About this transcript

This page contains the full transcript of Blender 3DCG Tutorial - Rigid Body Physics for Beginners by Kawaken 3DCG, generated from the public captions YouTube serves with the video. The transcript has 3,403 words across 565 segments, with the original timestamps preserved so you can click any line to jump to that moment in the embedded player.

What you can do with it

Use the transcript to take notes, quote the speaker, build a study guide, generate a summary with ChatGPT or Claude via the YouTube Summary tool, or export it as a timed subtitle file with YouTube to SRT. You can also re-open it in the transcriber to translate the transcript into 100+ languages.

Free YouTube transcript tool

YouTube2Text is a free YouTube transcript generator — no signup, no daily limit. Paste any YouTube link and get the full transcript instantly, with timestamps, click-to-jump, translation to 100+ languages, AI prompts for ChatGPT, Claude, and Gemini, and exports to TXT, SRT, VTT, or Markdown.