Questions tagged [physics]

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

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63
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?
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 ...
43
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2answers
32k 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 ...
32
votes
3answers
6k views

How do I prevent soft body balloons from crumpling when they hit walls?

In the last homework project for my Blender class, I had to make a balloon bounce across a ceiling as a soft body driven by wind. I fiddled with the constraints but it always crumpled on impact with ...
27
votes
1answer
14k 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" ...
27
votes
3answers
22k 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 ...
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 ...
24
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... ...
19
votes
4answers
14k 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 ...
19
votes
1answer
1k views

How can I make my gear simulation in the BGE work?

I have the movement and rotation restrained properly, but the simulation is not behaving like it should. both objects are rigid body objects. How can I make my gear simulation work?
18
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4answers
20k 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 ...
17
votes
5answers
27k 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
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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?
16
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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.
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 ...
15
votes
2answers
8k 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 ...
15
votes
1answer
776 views

What is the difference between passive and non-dynamic rigid bodies?

A rigid body can be either active or passive, and an active rigid body can be dynamic or not: The documentation says about the passive type the following: Object is directly controlled by ...
14
votes
1answer
3k views

Why does fluid (water) stick to the top of an obstacle?

In our simulation, Fluid (water) drops on an obstacle and splashes. It mostly works fine, but there is noticeable part which remains on top of the obstacle! In reality, there should be no water there, ...
14
votes
3answers
2k views

How to model physics in Blender?

I'm robotic engineer. I'm using OpenSCAD to model robotic components (gears, pulleys, parts, etc). But I need application to model physics and interaction of the components (for i.e. how will robot ...
14
votes
1answer
2k views

How to simulate string?

I want to make a group of party balloons. The strings on the balloons should have slack or be tight based on the length of the string and the location of the balloon. I thought the best way to start ...
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}) ...
13
votes
2answers
11k views

How to delete rigid body cache?

I can't delete rigid body cache from scene. When I delete old objects and add new ones they are acting like the old objects. I tried all options under rigid body cache panel in scene properties, Free ...
12
votes
4answers
2k views

Simple way to create a curved tunnel between two planes

I'm a newbie in Blender and I was trying to model a tunnel representing a wormhole embedding as the one in the picture, with no success. I tried to make a cilinder between to planes and subdivide it ...
12
votes
2answers
3k views

Yellow sticky note in the wind

I would like to make an animation of some yellow sticky notes (on a table) slightly moving in the wind. I already tried the cloth and soft body physics, but neither provide me the desired affect. An ...
12
votes
3answers
6k views

Soft body to Soft body collision

Is it possible to have two (or more) Soft body objects collide in Blender? I have tried enabling self-collision, but distinct objects don't seem to interact with each other at all.
12
votes
3answers
2k views

How to make a sandbag wall?

I need help trying to figure out the best way to make a sandbag wall. I've tried a few methods, but it doesn't look that good. I could just try again, but before that, I want to know if anybody out ...
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?
12
votes
1answer
1k views

How can I get a bullet-time effect (slow motion) in the BGE?

I'd like to transition from normal speed to slow-motion on certain events, such as a keypress. Is it possible to animate time in the game engine? If so, how?
12
votes
1answer
9k 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 ...
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 ...
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 ...
11
votes
3answers
6k 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 ...
11
votes
1answer
3k views

How do you make a cluster of cubes explode?

How can you make a bunch of objects explode? I don't mean fracture, I just mean shoot off in random directions. I want to know how to do this for a rigid body simulation. So how can this be ...
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 ...
11
votes
1answer
2k views

Bullet physics compound shape

I'm trying to to create a compound shape pretty much in the same way I did in my C++ code. Create three shapes (two btCylinderShape, and one ...
11
votes
1answer
3k views

Is it possible to create a fluid simulation of rain?

Is it possible to simulate rain with the fluid simulator? I tried to do something with a bunch of Inflow cubes that get enabled and disabled, however this is very tedious. Is there a better way? I ...
10
votes
2answers
3k views

Is it possible to simulate Brownian motion in Blender?

https://en.wikipedia.org/wiki/File:Translational_motion.gif I want to simulate some molecular dynamics. For that I want some area to fill up with some lipids. All these lipids would be considered as ...
10
votes
3answers
2k views

Creating a Liquid Bubble Effect

I saw some really cool 3d work here, and I want to know how to recreate this. What I want in the answer: How the particle system works (or model) How to color the layers (the blue, red, and orange)...
10
votes
2answers
14k 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 ...
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, ...
10
votes
3answers
2k views

How can I bake the physics cache of linked objects?

Imagine you have a rig that consists on bones and everything, and that in that setup you also include curve objects to do some physics simulation. All these rig objects would be part of a group for ...
10
votes
1answer
501 views

How to build building that is made of small pieces - how to correctly put rigid body over rigid body?

I'm new to blender and actually amazed from the possibilities it provides. I successfully created a set of boxes (like domino tiles) that fall in a chain reaction. (Like in this answer: https://...
10
votes
1answer
2k views

Why does my soft-body fly around?

My blend file I'm playing around with the Softbody engine in Blender to create something like this: ...but I've had no luck yet. Whenever I try to simulate, I get very strange results like this or ...
10
votes
2answers
881 views

Game Engine does not conserve momentum

I am trying to setup some physical simulation in the BGE where it would be best if the the total energy of the system is conserved. However, if looks like I can't get the physics engine to keep the ...
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 ...
9
votes
2answers
1k views

Diffraction of a wave passing through double slits

I am trying to create an animation of a wave propagating and passing through a double slit to undergo diffraction. The effect is something similar to the image attached: I have played with the wave ...
9
votes
3answers
5k 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 ...
9
votes
2answers
376 views

Pointy meshes pierce cloth sim. How can I get around this while also keeping the physical qualities of my cloth (e.g. mass, stiffness, etc.)?

Pointy meshes pierce cloth sim. How can I get around this while also keeping the physical qualities of my cloth (e.g. mass, stiffness, etc.)? Here is a simple example of the problem I'm having: I've ...
9
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 ...
9
votes
3answers
9k views

How to offset the start of rigid body physics to a specific frame

How can I tell Blender not to start applying physics until a certain frame? Is it possible? I have a very complicated shot, where a massive object is crashing though various different cell fractured ...

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