Questions tagged [physics]

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

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2
votes
1answer
697 views

Deforming a mesh in BGE runtime

I have two objects in my scene. One of them is a rigid body and it has to collide with the another one (soft body). I need to do the rigid body deforms the softbody in runtime and the deformation has ...
1
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1answer
3k views

Simulated hair isn't affected by force fields?

I have uploaded a blend file with a "Wind Blowing Hair Test" and it is my hope that perhaps someone can offer some assistance. I utilized a UV Sphere and applied a particle system along with a pair of ...
12
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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 ...
1
vote
1answer
815 views

How to get the normal of the face which was hit in a collision?

I would like to make an object stay at the height (Z) and velocity it was created at (it's created from another object with an Edit object actuator). Ideally it should be allowed to bounce up/down, ...
7
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1answer
2k views

Rendering from Blender Game

I made a physics simulation in the Blender Game engine. Is there a way to somehow render it as an animation as I normally would with keyframes in Blender internal engine? Or is there a way to convert ...
2
votes
1answer
513 views

How to push object straight in game engine

How can I push an object in a straight line with another object in the game engine? I made both objects dynamic, but when I push the object it moves in a random way. So how can I make it move straight?...
4
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2answers
1k views

Make particles wiggle (in a sine wave)

I'm trying to model a laser, and I'm using moving particles that are emitters. Using some motion blur, I get something that looks like particles going very quickly. However, I would like to give the ...
5
votes
1answer
574 views

Why don't effectors effect effectors?

I'm working on a scene with two balls that attract each other, they collide, bounce around, etc. I'm trying to do this by turning off gravity, setting each ball as an active rigid body and attaching ...
5
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1answer
1k views

Where is the character in physics option of blender 2.7?

Following these two tutorials, I can't figure out where is the character option in blender 2.7: https://www.youtube.com/watch?v=jxaHT_AFt_w https://www.youtube.com/watch?v=187knmhldR4
4
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1answer
3k views

My fluid domain disappears and appears to turn into the fluid object when I bake

I made this scene with a fluid simulation a few days ago, but the fluid domain turned into the melt word "ICE" instead of the cube I used as the domain. Is this supposed to happen? Where is the cube ...
6
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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. ...
3
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0answers
2k views

How to generate 3D crystal structures with blender? [closed]

I have asked a question earlier on how to generate 3D molecular structures. Most answers agreed that blender could do that. I have installed blender, but honestly it is bit complicated for a total ...
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0answers
91 views

Rigid body initial velocity/rotation? [duplicate]

Is there a way to specify a rigid body's initial velocity or rotation?
7
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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?...
3
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1answer
2k views

How to use rigidbody simulation for animation?

I want to be able to add rigid body physics to my gun when my animation character dies so the gun will drop smoothly, because it is hard to animate things dropping in small areas. I am not making a ...
9
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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 ...
6
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2answers
6k views

Using rigid body physics to set objects' initial positions [duplicate]

I have a problem where I used physics to position a bunch of meshes in Blender and when I try to set the current frame to 0 it resets the position of the meshes that have been positioned with the use ...
2
votes
2answers
6k views

Utilise GPU just for animation/physics, not rendering

I realise that the GPU can be used in Blender to accelerate rendering, but can the GPU be used to just perform animation/physics simulation? I'm currently using Blender to import some OBJ files, ...
2
votes
1answer
1k views

What is the minimum size requirement for a Fluid mesh object in a Fluid simulation?

What is the minimum size requirement for a Fluid mesh object in a Fluid simulation? I've heard and read that if the mesh is too small, it may not act like fluid properly when baking. But, I don't know ...
1
vote
1answer
6k views

Why will my fluid domain only bake once?

I'm trying recreate Ian McGlasham's "ALICE" fluid animation. In the process, I've been trying to adjust settings for the size of my fluid objects and also for the resolution of the domain object, so I ...
3
votes
1answer
2k views

Simulating a screw turning a gear

My goal is to model the parts for a guitar in FreeCAD and Blender, and then use Blender to make sure they will work before I have them made. I've started with the tuners, which consist of a screw ...
2
votes
1answer
2k views

SVG Model falling through the ground?

I'm trying to work with physics using an imported .SVG file (tried several files). Steps followed: Imported an .svg Extruded the .svg Converted curve (svg file) to mesh Created a plane. Applied '...
10
votes
2answers
818 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 ...
0
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1answer
191 views

How can I orient my object to fall the correct way in XNA?

I'm trying to export basic shapes from Blender into XNA. We have gravity working in XNA at the moment, but relies on the Y-coordinate being up. So when we export from Blender with the Z-coord up, it ...
2
votes
2answers
2k views

Fluid not filling container completely

I am using 2.70 with Cycles to recreate Ian McGlasham's "Alice Blender Fluid Cycles". However, for some reason my fluid does not fill the entire text -- for some reason it only fills part of the text:...
2
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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 ...
3
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1answer
1k views

Baking rigid body transformations

I have created a simulation using rigid bodies to create a nice pile of "things" that will be fairly realistic. Now I would like to save or bake these new positions and rotations from selected frame ...
1
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0answers
139 views

Why hair particle system with same settings act differently?

As seen from the attached file, Plane A and Plane B have different hair particle system, but with exactly the same settings. However, they acted differently. I just wonder what caused it. .blend file....
0
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1answer
662 views

Using Blender with cell fracture and trying to add collision via Python

Using Blender with cell fracture I have created a code that should select the objects created by cell fracture and give them the collision attribute and it does but only one out of a 1000. So it doesn'...
3
votes
1answer
2k views

Mechanical Simulations With Real-Time Physics [duplicate]

So, I know this is probably something that would better fit with a full-blown CAD program, but I love Blender, and I know Blender is capable of this sort of thing, I just don't know how to go about it....
2
votes
1answer
296 views

Physics Simulation - Objects going through one another

I am doing a physics simulation and I am running into some trouble with meshes partially going through one another. I am simulating physics using constraints. I am simulating an anchor being reeled in....
5
votes
1answer
1k views

How to get fragments of an exploded object to react more accurately to collisions with a plane?

Since a picture (or animated GIF in this case) is worth a thousand words, I will begin by providing an example of the problem I am trying to solve: As you can see, the fragments of the monkey never ...
6
votes
1answer
942 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 ...
3
votes
2answers
389 views

Smoke Domains in Blender

When doing the fire simulation within Blender Render can the smoke domain be anything other than a cube, such as sphere or other mesh?
8
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1answer
4k views

How to stretch a mesh object over another?

Let's say that I want to make, say, a tarp stretched over some objects (like some tools covered down on a military jeep) or a snake stretched around it's prey (I'm a horrible person, I know :P) or ...
5
votes
2answers
2k views

Simulate sound waves (physics)?

Can Blender be used to simulate the transmission of sound waves through a medium (most likely air)? What kind of additional scripting, if any, would be needed to actually render the collisions as ...
4
votes
3answers
7k views

How to make small objects fall properly with rigid body?

I have a bunch of dominos set up in my scene. I want them to tip each other over(aka the domino effect). However, they're not falling realistically. They're falling way to slow. My dominos are ...
1
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0answers
817 views

Modelling metal deformation properly

I'm looking for tips on how to realistically model metal deformation in blender. I would like to have ability to "fasten" a metal plate with virtual "screws" on a frame. Then I want to simulate an ...
2
votes
1answer
2k views

In Blender 3d, how do I start or change a wind force in a scene?

Some force fields, such as "turbulence" can be moved or changed. But wind is one of those that does not seem to have any handles for controlling it with key frames. Its just on all the time, and the ...
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
5k views

How do I Attach a Rigid Body to a Bone?

I'm trying to make rigid body physics interact with an (Armature-)animated character. For starters, I created a short piece of chain falling onto an animated box. The chain consists of 5 individual ...
19
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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 ...
2
votes
0answers
577 views

Using Physic tab in 2.68 to make swinging linked-chain--problem with “weight” and chain-links that snap

How do i strengthen the bonds/material in a plain linked-loop chain, in a non-kinematic chain--ie using "hard body" setting in the physics tab! these bonds behave strangely and break every time... I'...
11
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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 ...
2
votes
1answer
623 views

Warp time with rigid body physics?

Is it possible to warp time (slow time down, speed time up) with rigid body physics?
2
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1answer
2k views

How to create snow particle physics?

Image 1: Image 2: Any help or thoughts would be awesome!
7
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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
2answers
1k views

How to exit animation mode when using physics

This is a very basic question. I'm using tutorials to learn how to use physics in Blender. I made a cube and lifted it above a plane and clicked Alt-A to run the animation and let the cube fall. How ...
4
votes
1answer
3k views

Is it possible to float an object on a fluid simulation?

This question is related to Physics cross-simulation interactions?. Is it possible to make an object float/interact with a fluid simulation? It doesn't have to be full two way interaction, but I ...
5
votes
1answer
4k views

Why do fractured parts act like an explosion?

In the following we are testing cell fracturing applied to a UV-sphere (remeshed to blocks, BTW). We then apply rigidbody physics to the generated parts. When we start simulation as you can see ...