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Questions tagged [physics]

Questions pertaining to Blender's internal physics or the Game Engine physics.

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29 votes
1 answer
25k views

How to simulate a rope?

I'm trying to simulate a rope (that later might get pulled on the ends*) that interacts with some obstacles. So far I created a plane as the floor and a cube as an obstacle, and activated "collision" ...
flawr's user avatar
  • 743
52 votes
2 answers
52k views

How to make rig that reacts to gravity or seem to behave physically correct?

Here's a nice, strangely familiar hat. It's rigged with three bones. Let's say I want the hat to fall like a real hat would, and bounce around when the character which it's attached to moves. I could ...
Poyo's user avatar
  • 1,595
26 votes
4 answers
20k views

Physics are not simulated past a certain frame?

I've set up the physics of a swinging wrecking ball and set the animation to run for 240 frames. This was not long enough for the entire "swing" of the ball-and-chain. I'm unable to reset the ...
user1347's user avatar
  • 431
29 votes
4 answers
34k views

How can I add motion to a rigid body?

I'm trying to create a bowling animation and I want the ball to hit the pins. I already added the Rigid Body physics to the objects but can't get the ball to move. Obviously I could just add ...
Abandoned account's user avatar
28 votes
3 answers
3k views

Physics cross-simulation interactions?

For example, rigid bodies and fluid. I know it's kind of possible by setting the rigid bodies as fluid obstacles, but it's not "true" interaction in that the fluid does not affect the rigid bodies... ...
gandalf3's user avatar
  • 158k
10 votes
1 answer
5k views

Assign vertex group in Geometry Nodes (v3.3)

This is my Geometry Node Setup. (EDIT: Here's a .blend file showing my nodes, modifier, vertex group, etc.) I create a grid, rotate it vertically, and then select out the topmost vertexes to assign to ...
Emily's user avatar
  • 361
4 votes
1 answer
6k views

How to create a cable/wire for animation?

So I've created a "noodle" with a path and a bezier Circle that has soft body so that when I click play it will drop and flop about. What I'm trying to do is have one of the cubes stationary while ...
Khaz's user avatar
  • 43
19 votes
5 answers
35k views

Tips for making Mesh Rigid-body collision shapes more stable

Using the Mesh option in Properties > Physics > Rigid Body > Rigid Body collisions as the collision shape often makes the simulation unstable (objects jittering, falling through other objects, flying ...
66 votes
2 answers
25k views

How do blender units and meters, feet, or yards correlate?

If I'm using blender game engine, how do blender units work in relation to gravity, acceleration, or weight? Is there a rough physical world equivalent?
RobotHumans's user avatar
  • 1,047
23 votes
4 answers
29k views

Is there a way to make particles behave like rigid body objects?

I want to create a scene that has a lot of irregularly shaped objects piled up on the ground. I don't want the objects to intersect with eachother. I started off by creating a particle system that ...
MrVimes's user avatar
  • 557
8 votes
1 answer
11k views

Activate physics by keyframe

I'd like to have a group of debris fall from a ceiling onto the floor, but not have them drop all at the same time. Is there a way to set a keyframe that dictates when the object enters the simulation?...
Justin's user avatar
  • 2,012
16 votes
1 answer
4k views

Settings to fill an open container with objects

I am trying to create a natural arrangement of rubber thimbles in a jar. What is the easiest method of doing this? I've tried various settings with the jar being passive and using the various ...
user1722's user avatar
  • 163
2 votes
1 answer
1k views

Is there any way to export the last frame of a physics simulation from command line?

I have a basic rigid body physics sim, but I want to export the last frame of the simulation. So far I have tried setting the "current frame to the last frame of the simulation and exporting it that ...
Abhi Kondagunta's user avatar
21 votes
2 answers
6k views

how to create realistic/physically accurate sand blowing over dunes animation?

This question addresses exactly what I want but it hasnt been answered: How could I create a sand dune animation? In case it might be helpful I found this paper on the physics of it (although ...
Hmm's user avatar
  • 739
11 votes
2 answers
10k views

how do I make an object bend or break if hit with sufficient force?

How can I make a Ridged body simulation mesh so that it's solid under normal conditions, but if a heavy object collides with it, it bends as the force is transferred? (i.e. like a ball through glass ...
ZCoder's user avatar
  • 725
6 votes
1 answer
2k views

Reel in anchor using physics

I want to animate an anchor being pulled in by a motor on the boat. The anchor is attached to some chains. I am having trouble with the physics. I am using the built in physics system, not the Blender ...
Vader's user avatar
  • 14.8k
4 votes
1 answer
5k views

Are curve physics possible?

For example, I'm using a tree generator addon that creates trees in curve form. I have a strong wind forcefield in the scene as well for the grass. Is it possible to apply the curve to the physics?
user avatar
4 votes
1 answer
835 views

Create a shower hose with correct physics

I'm making a shower hose that follows the handle when it moves. I've created it successfully following THIS tutorial, but the hose is too "elasticy". I'm wondering which settings I should change (...
gatzkerob's user avatar
  • 315
3 votes
3 answers
4k views

Precise Mechanical Rigging of two arms connected by a rod

https://youtu.be/86DtgBiUDvI I have done this using the y-rotation of the Blue rod to drive its z-location. The Top rod is driven by the z-location of the Blue rod. As you can see, the animation ...
Log's user avatar
  • 125
55 votes
3 answers
7k views

Creating Inky-looking characters in Blender

I'm involved in a project to do with ink animation and experimentation. I found this incredible piece of animation: Chinese Ink Style Animation I originally thought this was some sort of After ...
Jacob W.E's user avatar
  • 551
13 votes
2 answers
12k views

How to bake multiple fluid simulations in one scene?

If we understood correctly, Blender does not allow more than one domain for fluid simulation in a given scene. This means that any inflow (fluid) object will be transformed into only one domain object ...
Developer's user avatar
  • 1,607
8 votes
1 answer
14k views

Is there a way to make rigid body interact with softbody physics?

I'm trying to have a surface with soft body hold obects that are falling on it with rigid body physics, but for some reason, no what matter what mass I give it, the objects just fall trough the ...
user avatar
5 votes
2 answers
31k views

How do I stop hair particles going through the body and the head?

Target : I intend to have long lady hair that go swirling in the wind. I am trying to achieve that through hair dynamics. Problem: Hair are going through mesh(body and head). I am using blender 2....
code_guri's user avatar
  • 135
2 votes
1 answer
312 views

Distributed interaction visualization

I'm just getting started with blender and have been playing around with it for a few weeks. I have a pretty particular use case and wanted to see if blender could assist me in that. I have written a ...
joethemow's user avatar
  • 121
2 votes
1 answer
1k views

Near/radar/ray/collision sensors refuse to work

None of the physics sensors in my game work, I'm trying to create an AI man that chases after a player, but for whatever reason, he just won't sense the player, I've tried copying and pasting the ...
ruckus's user avatar
  • 7,643
16 votes
3 answers
14k views

How can I create a smooth looping animation for cloth simulation?

I have created a waving flag simulation by pinning a set of points, adding cloth physics, and setting up wind forcefields. The result is just fine when I render the scene except that I want the ...
Torleif's user avatar
  • 261
9 votes
1 answer
3k views

Passive rigid body physics not working with screw modifier

I'm making a rolling ball animation where the ball will roll around a set of pipes, planes and other objects. I created a spring using the screw modifier and then made a second slightly smaller spring ...
Steven Akers's user avatar
9 votes
1 answer
3k views

Scaling a Soft Body object (Inflated balloons in a box)

I've seen abstract animations around the internet, in which bubbles grow in size within a closed area and get squished against each other and the walls in a realistic way. At 11 and 15 seconds there ...
MicroMachine's user avatar
  • 4,703
8 votes
2 answers
3k views

Make a mesh/plane deform on collision (and stay deformed)

I want to create a animation like those "spacetime deformation" ones, but I am stuck on creating "spacetime". (a mesh/plane). I created a plane, gave it a soft body, collisions, and a passive ...
user avatar
7 votes
2 answers
8k views

What is the difference between an Active animated rigid body and a Passive rigid body?

In the Rigid-body settings, there are two options, Active and Passive. My question is, What exactly does the Passive setting do? how is it different than Animated Active? (I know what Active and ...
gandalf3's user avatar
  • 158k
27 votes
1 answer
3k views

Is it possible to simulate an egg?

Is it possible to simulate an egg? Specifically, I was wondering how to handle simulating the yolk. I was thinking fluid simulation, but it seems you can't a specify different viscosity for ...
gandalf3's user avatar
  • 158k
16 votes
3 answers
8k views

How to simulate magnetism In Blender?

Is there a way to create magnetism in Blender? Using the physics engine or the game engine, I want to create BuckyBalls (the magnetic toys) within Blender.
Starius's user avatar
  • 1,114
6 votes
3 answers
3k views

Can gravity be disabled for a single object in the BGE?

I created a scene with my camera parented to a player object and a few bouncing balls. I want the player to stand still (in space) unless moved by user interaction and interact by the balls when hit. ...
stacker's user avatar
  • 38.6k
4 votes
1 answer
897 views

How to twist a cloth?

I am starting to get pretty stressed and sad. This is for a mobile game I have accepted a project for and if can't solve this I might have to drop this project which will cost me a bit. So if you ...
Vlad Ilisan's user avatar
4 votes
1 answer
2k views

How To Make A Solid Object Drop To The Ground Like It Was Liquid

So I have a simple bouncing ball animation, but I just wanted to something "weird" for the ending. Is there a way to change the ball's material on the fly, where after the last bounce it changes ...
Starius's user avatar
  • 1,114
2 votes
2 answers
2k views

how to build a carriage that reacts to an uneven ground

Dear Blender Community, i would like to build a very simple carriage kind of vehicle, that is simply pushed or dragged over a surface and has the possibility to react to it. My first idea was to use ...
Almagor 's user avatar
1 vote
2 answers
801 views

How do i pin a ball to a cloth sim rope to create wrecking ball?

as you see in the gif, i have the rope already pinned on the one side but i couldn't parent/pin or use a hook to get the ball to follow. I'm looking to have the ball add its weight and other physics ...
Starius's user avatar
  • 1,114
0 votes
1 answer
607 views

Animating active object in physics simulation

I would like to pick an object from a conveyer belt.but I find difficulty in animating the active object(rigid body simulation) and assigning 'child of' constraint to the active object which in this ...
Daniel John's user avatar
12 votes
1 answer
4k views

How can I simulate powder with a particle system?

I want to simulate powder, are particles the best job for this and if so what settings could I use to achieve this in Blender?
Turbo's user avatar
  • 1,155
12 votes
3 answers
10k views

Is Physics calculation multithreading possible?

Is there a way to turn on multithreading to make use of all of my computers cores for simulations? I am running on a monster of a machine, but without utilizing all of the cores, physics simulations ...
Dana's user avatar
  • 899
9 votes
1 answer
2k views

How to make a Rigid Body fall off a conveyor belt?

I've created conveyor belt and and two objects with rigid body physics. But the first object won't fall and second object falls backwards. How can I fix it? Video of the problem Blend file
haidarvm's user avatar
  • 323
7 votes
1 answer
2k views

How can I make water follow a path?

How can I make water follow a path?
chao's user avatar
  • 71
7 votes
1 answer
2k views

How can a force be applied not to the center of a rigid body object, but to one specific vertex of the object?

Scenario: a stationary bar-shaped (rigid body) mesh floating in space (i.e., neither gravity nor friction/drag), that gets a short-lived force vector applied to one of its corner vertices, where the ...
Will's user avatar
  • 259
7 votes
2 answers
9k views

How to make cloth 'catch' a falling object, slowing its fall?

I simply want to make a pinned cloth catch a falling rigid body so as to slow its fall until it comes to a halt. At the moment, the ball falls and the cloth interacts with it, but the ball will pass ...
Ben Hayward's user avatar
5 votes
1 answer
4k views

Self Collision - Blender Cloth Sim shrinks mesh

I have been searching for days and have not been able to find an answer to this question. I have a simple model. A thin cube with default collision physics applied and a plain 1x1 with default cloth ...
Rookie29's user avatar
4 votes
1 answer
5k views

How to make grass respond to an object hitting them

How can i make the grass bend when this cube hits it? Here's the picture:
Tucker's user avatar
  • 534
4 votes
1 answer
1k views

Creating looping cloth animation for sprite

Helllo! For a project that I am doing, I need to render the my model to a sprite sheet. This is all fine, except that the model has a cloak, which uses a cloth animation. I need to smoothly ...
V F's user avatar
  • 41
3 votes
1 answer
3k views

Prevent fluid to flow through the walls of an obstacle

I am trying to make a fluid simulation flow out of the orbits of this skull (I hope this doesn't violate any guidelines), as a little experiment / practice with fluid simulation. The result is not ...
MicroMachine's user avatar
  • 4,703
2 votes
2 answers
13k views

hard self collision: make particles occupy space

By default, Blender's particles don't have any spatial extension. This is fine as long as particles are rendered as halos. But if you give them a size and an appearance as object, it becomes obvious ...
Ichthyo's user avatar
  • 551
19 votes
2 answers
10k views

What is the technical difference between softbody and cloth simulation?

They are definitely different, but soft body simulation is very slow compared to cloth.. why?
gandalf3's user avatar
  • 158k

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