Questions tagged [physics]

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

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28
votes
1answer
16k 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" ...
22
votes
4answers
15k 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 ...
27
votes
3answers
24k 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 ...
44
votes
2answers
35k 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 ...
25
votes
1answer
2k 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... ...
63
votes
2answers
22k 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?
20
votes
4answers
21k 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 ...
18
votes
5answers
28k 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 ...
16
votes
1answer
3k 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 ...
3
votes
1answer
3k 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?
8
votes
1answer
8k 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?...
1
vote
1answer
678 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 ...
4
votes
1answer
431 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 (...
54
votes
3answers
6k 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 ...
11
votes
2answers
8k 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 ...
4
votes
1answer
4k 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 ...
2
votes
1answer
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 ...
11
votes
2answers
9k 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 ...
15
votes
2answers
9k 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 ...
6
votes
2answers
7k 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 ...
2
votes
3answers
3k views

Precise Mechanical Rigging (Intuitive method)

https://youtu.be/86DtgBiUDvI Hi, 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 ...
7
votes
2answers
2k 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 ...
26
votes
1answer
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 ...
16
votes
3answers
6k 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.
4
votes
2answers
16k 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....
6
votes
3answers
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. ...
5
votes
1answer
8k 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 ...
4
votes
1answer
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 ...
12
votes
1answer
3k 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?
8
votes
1answer
562 views

Magnetic Spheres

I would like create a simple animation; Two spheres at a given distance each with a magnetic moment such that they are attractive. i.e. that when you simulate/animate, the spheres should come together,...
11
votes
3answers
7k 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 ...
7
votes
2answers
6k 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 ...
3
votes
1answer
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 ...
2
votes
2answers
12k 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 ...
8
votes
1answer
2k 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 ...
7
votes
1answer
2k views

How can I make water follow a path?

How can I make water follow a path?
6
votes
1answer
1k 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 ...
4
votes
1answer
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 ...
4
votes
1answer
3k 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:
2
votes
2answers
900 views

Electromagnetism Simulation

I would like to create a basic electromagnetism simulation in blender; just two separate coils attracting each other (they slide and touch). I'm good for modelling this, just not sure how to set up ...
3
votes
1answer
232 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 ...
17
votes
2answers
7k 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?
5
votes
1answer
2k views

Scaling a Soft Body object

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 ...
11
votes
2answers
3k views

On what Cloth Simulation Model is Blender Cloth Physics Based?

What research papers were leveraged to implement Blender Cloth? I know of several cloth models - Geometric, Physical, Particle. There are several researchers who have published work within each type ...
7
votes
2answers
9k views

unexpected reactions in a quiet simple rigidbody physics simulation

Try the following scenario: scene: Add a cube; add a UVsphere; move sphere on X axis until less than half sphere intersects the cube. make a duplicate of sphere; apply boolean on cube (difference ...
10
votes
2answers
2k views

How to have rigid-bodies and charge fields interact?

Using the answer in "Why don't effectors effect effectors?", it is possible to have rigid body objects interact with each other using force fields. However, I would like to do something similar using ...
4
votes
1answer
702 views

Building a Conveyor

How would I build a Conveyor like this in blender? Thanks
5
votes
1answer
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 ...
3
votes
1answer
1k views

How to make a rope in the BGE?

I'm pretty sure this has been asked before, but for the life-o'-me I couldn't find it. How would one setup the physics for rope in Blender Game Engine? I tried soft-body; didn't work Incremented/...
10
votes
1answer
2k views

Getting the location of rigid body object at current keyframe

I would like to print out the location of an object with this script: import bpy obj = bpy.data.objects["Cube"] print(obj.location) It prints it out correctly, ...

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