Questions tagged [physics]

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

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10 views

How to start momentum in blender 2.8

I'm working on a pistol firing animation and I want the shell casing to fly out of the gun and have physics figure out how it comes down because I find animating objects mid-air very difficult. So I ...
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1answer
33 views

Can anyone help me rig a watch escapement?

I have this modeled already but I have no idea how I can properly rig for animation. I am specifically looking rig and animate the flat spring underneath. I would love to figure out how to simulate ...
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Physics in blender 2.8 - can't interact with objects while simulation is running

Do this in both blender 2.8 and 2.79: Create cube, enable rigid body physics, set to active, run animation, drag and release cube. In blender 2.79 cube will act like a real life object, that is, it'...
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10 views

Exporting a Wet map image in Blender 2.8

Yeah I know how to export a wetmap in Blender 2.79 but I do not find the option in 2.8. I'm talking about the physics tab in Dynamic Paint there used to be an option to save your wetmap. In 2.8 that ...
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Soft Body and Hair collison in 2.8 goes haywire

When my fuzzy ball touches a cube with collision enabled the hairs go crazy. How do I make the hair particles not go crazy. Please check the attached blend file.
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How do I make clothing move with an MBlab model?

I made some clothing for an MBlab model from a plane and I pinned some vertices on the clothing but I don't know how to make the clothing move with the model and its armature. I've tried using the ...
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7 views

Add “pre-simulation” clothing physics to end frame of animation

Is there a way in Blender 2.79 to "revert" an object's clothing physics to its original "pre-simulation" positioning in any frame for an animation? I'm working on an animation and using both clothing ...
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22 views

Create football scene [duplicate]

I want to create a soccer scene which will contain the following components: soccer field soccer ball goal soccer player The simulation can be controlled using the following parameters: kicking leg ...
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1answer
44 views

Walking Neural Networks In Blender?

Is there a way to do this in Blender on Windows? If this specific one isn't a capability, are there other neural net things that I would be able to experiment with in/with Blender? With that example,...
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Can Armatures w/ passive rigid body mesh notice resistance from active rigid body objects?

This is about the laws of physics, the Rigid Body System, and Armatures or ‘Passive’ animated rigid body objects interacting with ‘Active’ rigid body objects... I use Blender to illustrate the ...
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10 views

copy position keyframes across time?

Is there an elegant way to copy location/rotation date from one object at some frame to a different object at a different frame? Right now, my best idea is to play a lot with "Apply visual transform" ...
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31 views

Having trouble 'throwing' rigid bodies with velocity

I'm trying to throw a sphere with a horizontal velocity in a similar way as in this video https://youtu.be/TFseMPGRz1Q. I have the initial location keyframed on frame 1 and the new location keyframed ...
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Why does rigid body simulation sometimes pass through and sometimes not pass through objects? [duplicate]

The video is pretty self explanatory, but when I drop the ball on conveyor belt the rigid body simulation acts nicely, but after rolling down the ramp no longer. As far as tests have shown, there is ...
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Blender Hair Simulation is making a Wall

In Blender 2.8, I made a grassy area and used hair simulation to create the grass. The only problem is that it seems to have created a wall on the edge of the plane. I have also noticed that as I ...
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1answer
16 views

Is it possible to simultaneously adjust the cache settings for multiple objects?

For example, changing the start and end of a simulation for multiple objects with soft-body physics applied. Changing this: Would change the cache settings for SoftBody.1, SoftBody.2, SoftBody.3 (...
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13 views

Create self-multiplying particles

Trying to visualize the behavior of high energy particles (physical particles like atomic nuclei, not Blender particles), I encountered the problem, that the decay of particles seems not be possible ...
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1answer
25 views

Fire Simulation completely disappears from scene (2.8)

Im making an Iron Man flying over city sort of clip, and i had perfectly good fire sim yesterday. I woke up today and came back to the project and there is no sim in my renders, viewport, nothing. I ...
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how to control hair particles under a hat

I with to animate a woman character, she is wearing a hat. I struggle to understand how I can control the hair when I also apply hair dynamics, i.e. so it doesn't cross the hat or go obove it. for the ...
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1answer
46 views

How to animate object target positions while respecting rigid body collisions?

I would like to have about 20 shapes and animate the target position for those objects. The objects would try to reach those positions, but colliding with each other (instead of going through each ...
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38 views

How do i fix rigid body constraint problems in blender 2.8?

I recently downloaded Blender 2.8 and decided to test out some rag-doll physics for fun. However, after opening an old Blender 2.79 rag-doll project into 2.8 I found that my rag-doll was glitching ...
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1answer
19 views

Hair glitch in cycles

So I my jumping model has dynamic hair, and with some time hair just start to extend quickly even though I don't have any growth set, it is some kind of a glitch. How can I fix this? I need just ...
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1answer
63 views

How to export physics data from Blender 2.80 now that BGE is gone?

The add-on I used ("blender-bullet-export") worked enough to export rigid bodies from the scene into a .bullet file, but it relies on BGE. Now that BGE is gone (for good) in Blender 2.80, what can we ...
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41 views

Physics Control

I have a technical question. Let's say I want to create an environment with an event for example: a man kicking a ball Can I control the physics of the scene? I would like to define the ball's ...
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How to add collision for a Physics enabled tail?

I have a character with a rather large tail and thanks to this answer-> How to make rig that reacts to gravity or seem to behave physically correct? I was able to give it physics to give me some ...
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1answer
17 views

Relationship Between Rigid Body Colliisons and Animation Keyframes

I am working on an animation consisting of a pool ball being struck by a cue stick and then picked up by a mechanical mechanism. I get can the sequence of the collision and the animation of the crane ...
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Modelling ornamental grass procedurally

I am trying to model an ornamental grass procedurally (Miscanthus sinensis 'Gracillimus'). I want to be able to do this procedurally (not combing for example) because, unlike normal grass, it has a ...
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1answer
30 views

Active rigid body objects fall through other passive rigid body objects

I am designing a Galton Board, so I have a group of marbles, which are active rigid bodies, and then I also have a bunch of rectangles, which the balls are supposed to hit and then veer off. And ...
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1answer
17 views

Make parts of body mesh go through clothing mesh during simulation?

I have a walk cycle set up on my model but when her hands pass her body they also affect the skirt she's wearing which messes the skirt physics up in ways that would be better if I just had her hands ...
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Animate object and render last frame using python script

I have a scene where some bottles are falling into a tray. I need to create a python script that runs this animation and renders the last frame and saves it. I have been looking for a method to do it ...
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1answer
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Why is the fire not rendering when sphere (domain) in viewport is hidden?

The actual question is basically what I'm asking. The Sphere is the domain so the fire and other animations will be contained within it. I would like to hide this sphere for a much more realistic ...
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1answer
46 views

Why am I getting magnetic effects from cloth objects?

Using the current Blender version, 2.8 RC2. This setup was according to another posting I followed to learn how to create curtains and get a pulled back/curtain ring effect. For the most part it ...
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38 views

Why my rigid body act differently when I have small adjustments in simulation?

I have this simple rigid body cube simulation where the red cube is active while the rest of objects are passive when the simulation starts, this cube will roll all the way down, bounces and fall ...
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25 views

How to create Heat Distortion Shockwave for explosion?

I have seen a number of tutorials on Shockwaves and they all look cartoonish to me. I have seen a tutorial by Andrew Price and another one using a plane and a refraction texture animated with noise to ...
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28 views

Cloth vibrating with object collision turned on?

On the character rig I'm creating for an animation, I have a cape, which is a piece of cloth which is solidified to give it thickness. However, I want it to collide with the torso, head, and arms of ...
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What is the quickest way to get stable cloth-like deformation where nothing falls due to gravity or perpetually wobbles insanely?

No matter what setup I have, no matter how many times I try to do it whether with gravity or with some force that points up to counteract gravity, it never seems to completely work. I want to just ...
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1answer
34 views

Is there a way to simulate water balloon physics in Blender?

Trying to animate something in Blender and I thought I might try and give it water balloon physics. I don't know how to simulate these kinds of physics so I was wondering if anyone has any suggestions....
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1answer
68 views

Animation with Physics (Cloth | Collision)

Problem How can I make the fabric stop exactly where the tube thickens and prevent it from continuing its free fall to infinity and beyond Example I want the fabric to stop exactly when it reaches ...
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Rigid Body Problem [duplicate]

I have been trying to do Rigid body physics tutorials, and I keep running into the same issue. To show my problem, I did a basic cube with a basic sphere.I delete the top face of the cube. I add ...
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32 views

How to make a floor with collisions, so my character can walk on it

I have made a funky T-rex and am trying to better my animations (fifth week on Blender) but I'm having trouble with the walk cycle and I think it would look better if I could make it so that the T-rex'...
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1answer
68 views

Why are my hooks and sewing not holding my cloth in place? [duplicate]

I’m trying to solve the problem detailed in How can I make my cloth sim show tight folds? but I’ve run into an issue where the hooks in my cloth are not holding it in place when my monkey head ...
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How can I make my cloth sim show tight folds?

I'm trying to achieve visuals like the following: Unfortunately, this is the best I've got so far... I'm using the 'pinning with hooks' method seen halfway down this page - I'd let the cloth drape ...
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19 views

how to make grass particle system interact with rain drops?

i would like to make it so whenever a rain drop hits a blade of grass it bends and moves.
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22 views

Why is my cloth colliding so weirdly?

I am trying to simulate cloth on top of an umbrella, that's blowing in the wind. Right now I'm already struggeling with the cloth clipping through the base of the umbrella. I tried isolating a single ...
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Why are some rigidbodies falling through passive objects and others are not?

I've been trying to simulate a chain falling onto a platform, but after I've applied active rigidbody modifiers to all links of the chain, and applying a passive rigidbody modifier to the mesh below, ...
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Physics and calculus in blender

I'm physics student and I want to calculate things on blender, I've to learn many things of the program and I'm starting on it. I want to know if it's possible to do some calculus inside blender, for ...
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Cloth simulation not working because of a missing step

I am trying to simulate some clothes in 2.8, I fixed a suit in marvelous designer on my character in T-pose, then did a retopology for the suit. In Blender I: imported the character with an ...
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1answer
57 views

How do I simulate a rotating, wobbling and falling spinning top…?

looking to physically simulate a spinning top in Blender. I'm a moderately experienced Blender user, but not very familiar with its physics systems. At the moment I have the (rigidbody) top spinning ...
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2answers
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fire and smoke in same domain

i like to create a fire and smoke simulation in one domain with different emitters. But I can only change the colors from both the smoke and the fire. I like to set different colors for the flames and ...
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14 views

Impact Forces in Blender Game Engine

I am using the blender game engine to run drop test physics simulations and I was wondering if there is a way to collect the force and impact data from the collision. Maybe using "appliedImpulse"? I ...
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1answer
31 views

Physics with an object made of several parts

I am trying to throw a die made of several parts that must stay fixed. The purpose is to get a realistic physical behavior. What I tried : The small parts have an object constraint : Child of set to ...