Questions tagged [physics]

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

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19
votes
4answers
12k 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 ...
21
votes
1answer
8k 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" ...
38
votes
2answers
24k 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 ...
27
votes
3answers
16k 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 ...
23
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... ...
15
votes
4answers
16k 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 ...
64
votes
2answers
21k 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?
13
votes
5answers
24k 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 ...
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 ...
52
votes
3answers
5k 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 ...
12
votes
2answers
7k 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 ...
10
votes
2answers
6k 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 ...
5
votes
2answers
6k 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 ...
0
votes
2answers
228 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 ...
26
votes
1answer
2k 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 ...
11
votes
2answers
8k 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 ...
14
votes
3answers
5k 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.
7
votes
1answer
6k 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?...
6
votes
3answers
2k 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. ...
4
votes
1answer
1k 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 ...
4
votes
1answer
21k views

How can I make sure that simulated cloth doesn't go through other objects?

I am trying to simulate a wedding dress animation. So I put a solidify modifier on the dress, and I defined the dress as a cloth. The lower part is free (pinning of the upper part). I unchecked "...
2
votes
1answer
276 views

Rigid body physics problem even a torus acts like it had no hole in it

When i apply rigid body modifier after punching a hole in a cube for inserting a rotatable propeller so that it rotates only when something collides with it. But when i run the simulation the ...
2
votes
1answer
227 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 (...
10
votes
3answers
5k 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 ...
3
votes
1answer
1k 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?
2
votes
2answers
10k 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 ...
10
votes
1answer
1k 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, ...
2
votes
3answers
2k 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
1k 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 ...
7
votes
1answer
1k views

How can I make water follow a path?

How can I make water follow a path?
0
votes
1answer
638 views

Object won't drop after keyframing animate physics

I have an animation with many objects falling to the ground and then bouncing and rolling around normally as dictated by physics. For the objects that fall starting at frame 1, everything works ...
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?
7
votes
1answer
442 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,...
12
votes
1answer
8k views

How to correct collision between particles

In the use particle system how to avoid two particles intersect each other as in the following figure: Our settings for ...
3
votes
1answer
2k 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 ...
14
votes
2answers
6k 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?
7
votes
2answers
8k 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 ...
4
votes
1answer
649 views

Building a Conveyor

How would I build a Conveyor like this in blender? Thanks
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/...
14
votes
1answer
2k views

How to attach colors (e.g., gradient color) to fluid particles

This is follow up question based on {this post}, indeed. The question is how to attach color attribute to fluid particles? For example when a part of colored fluid (as explained {here}) ...
9
votes
3answers
4k views

Seamless looping animation

I'm trying to create an animate gif of a boat where there's no discontinuity between the end and the beginning. To do this, I need the sails and flags of the boat to return to approximately their ...
6
votes
2answers
11k views

How to bake rigid body physics frame in blender render?

I have a model with some objects above eache other and enable rigid body physics for them so the upper ones fall on the lower one. Now when I play the animation to a certain frame how can I put it as ...
6
votes
1answer
653 views

Balloon Simulation - String is floating like balloon

I'm trying to simulate balloons gathering under a tent. I've finally figured out the stiffness and gravity of the balloon using a combo of soft body and rigid body modifiers, but the string is now the ...
6
votes
1answer
929 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 ...
5
votes
1answer
560 views

Hair Particle system and Fluid Simulation interaction

Making a scene with grass made with a hair particle system in a fluid simulation. I was wondering if there is any way for the hair particles to be able to sway based on the fluid simulation. If so how ...
3
votes
1answer
780 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 ...
1
vote
2answers
620 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 ...
0
votes
1answer
1k views

How to [dynamically] pin soft body objects to another mesh?

My goal is to use the Armory addon to move the two soft body meshes to interact some rigid bodies in the scene. For example, I want to apply forces the soft body objects to bring them closer to each ...
8
votes
1answer
4k views

Exporting (bullet) collision shapes

I'm writing a scene exporter from blender to a format to be used by a game. I need to be able to export physics information the game needs, mainly the collision shape of every object (either the one ...