Questions tagged [physics]

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

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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 ...
3
votes
2answers
1k views

How to constrain rigid bodies to an axis?

In the game engine there is an option to constrain rigid body translations and rotations on an axis: Is it possible to do this with the 3D view rigid body physics system?
3
votes
1answer
292 views

Get smoke simulation to observe emitter's pose? [closed]

Right now I am making a model of a wind elemental in blender, and was trying to use the smoke simulation to make a small whirlwind that swirls around its main body. However, the smoke simulation ...
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 ...
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, ...
8
votes
1answer
2k views

How to exclude objects from cloth's collision?

I have a bed in a room with lots of objects. I'd like to put a sheet over the bed by simulating the sheet as cloth falling over the bed (which has collision enabled). Problem is, I have many other ...
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
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 ...
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 ...
2
votes
2answers
2k views

How to simulate engines spraying a fluid?

You know an aircraft engine? The gigantic fans on the sides of the aeroplane? Well, there will be seven of those in a circle facing to where the powder comes out and it will spray a liquid onto it. ...
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?
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 ...
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 ...
5
votes
1answer
454 views

Curve guide on linked object

I am linking in a rigged character to another file. But I cannot seem to get the "Curve Guide" physics to work for the hair of the character. Some bones of the rig controls some empties that in turn ...
2
votes
1answer
4k views

Cloth simulation not animated in 3D Viewport [closed]

I'm following this tutorial, and came to the step where I start the physics simulation for a piece of cloth dropping on an object (11:25 on video); When I press the "play" animation button, the cloth ...
3
votes
1answer
1k views

Is there a way to shrink particles to mesh surface?

I attempted to create a dripping effect like this: On a curved surface using this technique, however the long particles don't conform to the surface, looking very unrealistic (it looks particularly ...
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 ...
6
votes
1answer
884 views

Rigid body simulation always has a visible collision space

Every time I use the rigid body tools I have a visible space between the passive object and the active object, even when I set the collision margin to very small or zero. Any suggestions?
18
votes
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 ...
6
votes
1answer
3k views

Why do the objects in this rigid body simulation rotate too slowly?

I was attempting to simulate a bowling ball impacting a set of pins, however the pins just slide away instead of going flying like they should: As you can see, the origins are in the correct place. ...
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 ...
8
votes
1answer
2k views

Exporting to Collada: Physics don't get exported

I added basic rigidbody characteristics to a default sphere in Blender and exported it to Collada but the physics information isn't exporting. How can I get the physics data to be exported along the ...
3
votes
3answers
2k views

How do you stretch and then release a soft body or cloth so it springs back like elastic?

I have a soft body mesh and an armature. I have one bone holding one end of the Soft body and another bone used to stretch the soft body. I then want one of the bones to let go of the soft body so it ...
4
votes
1answer
692 views

Building a Conveyor

How would I build a Conveyor like this in blender? Thanks
6
votes
1answer
2k views

Calculating acceleration or velocity of a point on a rigid body?

I have a rigid body simulation involving a solid body. It is a simple simulation with a box shape on a plane. The plane is slid out from under the box so it falls due to gravity. Due to friction ...
7
votes
1answer
3k views

Rigid body animation with constraints and relationships

I want to drop a Padlock object that not only bounces the main body of the lock but has an open lock that also swivels when it hits. I can't do this with a parent child relationship since it isn't ...
1
vote
1answer
869 views

Locking an object's pivot point in game engine

In the game engine, how do you lock an object's translation while letting it freely rotate? I've got a record with grooves, with random noise added to all vertices in the z direction. The needle/arm ...
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 ...
6
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 ...
16
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.
3
votes
1answer
413 views

Export BGE Soft-body Distortions to 3D view?

Is it possible to get BGE soft-body simulations into the normal viewport? I know you can get the animation of the object itself, (with record animation to keyframes) but how to get the distortions of ...
16
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?
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.
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 ...
7
votes
1answer
1k views

What's the meaning of tangent in the velocity panel in the particle settings?

I wish to know the meaning of the "tangent" option available in particles panel; for a surface in 3D, tangent means a surface. But velocity is a linear, directional entity. I am currently working on ...
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... ...
7
votes
1answer
997 views

How to create a workable leaf spring in Blender?

I want to create a leaf spring which can be used in a physical simulation to spring away the objects when it is being deformed. Should I use a soft body to do this? However, it doesn't seem like soft ...
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 ...
7
votes
2answers
835 views

Why can't I have an inflow with an animated mesh output to local coordinates?

If I check Export Animated Mesh for an Inflow in fluid dynamics, I lose the option of using local coordinates. Why? What can I do about it?
9
votes
1answer
2k views

How can I scale particle size over lifetime within a keyed physics system

I am trying to make an alka-zeltzer in a glass, creating bubbles that form a logo on the water surface. To do this I am using keyed particles and everything works fine. However, I would like to have ...
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?
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 ...

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