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Questions tagged [physics]

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

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How to detect when objects in a scene are stationary?

I wanted to do something like this: simulate the stack box scenario, determine that the simulation is stable, and record the position and pose of the box. Here's how I think about it: there is a ...
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44 views

Adding multiple Physics constraints to a single object at different points (ie: 4 corners)

I would like to attach multiple physics basic spring constraints to a single plane, or any object, but it seems that they only attach to the origin of the object. Is there a way to attach it to a ...
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How can you change the center of gravity while keeping the center of origin as is?

How can you change the center of gravity while keeping the center of origin as is? This question is different to the previous version by another user.
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How to stop ridgid body object floating around?

I have atached a link to the problematic blend file. https://www.dropbox.com/s/vaxriy8lfo1palg/robotHat2-animated_ridgid%20body-copy%20float%20hat.blend?dl=0 At about frame 300 it appears that the hat ...
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37 views

How can I make objects fall at steady speed?

I have two objects (same size, same geometry) falling from different heights; obviously the object in the higher position speed up and has a different behavior when hitting the ground, compared to the ...
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28 views

Why is my rigid body object floating as if there is no gravity?

I have two issues on my current file that I cant seem to solve (see link below)? 1) why is the hat being thrown appearing like it is floating and not affected by gravity towards the end of the ...
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1answer
152 views

smoke comes out in bursts from moving object

I am making a firework with a fuse to look like a S, and when i bake the flame, it is OK at first while the firework is not moving very fast, but when the firework speeds up, the flame comes out in ...
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Can anyone help me with my project? [closed]

I want to create a simulation of the Solar System and I don't know where to start and how to do quite a few things such as: create an orbit for each planet make sure that the objects orbit at a ...
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what physics to use to make poly hair flow in wind?

the hair is poly hair made from several planes, and I already parent it to the rig, but it just moves like a box along with the head, I want to make it flow in wind, something like cloth physics, but ...
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How would you set 2 “child Of” constraints on the same object?

How would you set 2 "child Of" constraints on the same object. I already have a "child Of" constraint on the Hat using the robot hand as target. Because the hat is not parented to the body, it stays ...
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1answer
48 views

What is the easiest way to simulate objects being caught in a cloth, like a bag?

I've been fiddling with physics for about three hours now, I'm trying to create a trampoline physics scenario, or a stretched cloth with a pinned diameter catching a falling object. My falling ...
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How to add regular animation after a rigidbody bake

I am creating a small animation with some dice dropping down and rolling using rigidbody. I want to be able to slide some off the dice to the side and then re roll until the animation gets yahtzee. ...
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Make hair bones collide with parent mesh?

I’ve followed this tutorial, which is excessively in depth. Essentially it is a line of verts given a cloth modifier, an empty parented to each vert, and bones between each set of verts with IK set to ...
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Sprinkles are seeding when scaling object in animation

i'm scaling the icing and all the sprinkles are changing positions at every frame. I'm on the latest release as well (2.81). Is there a way to solve this? Here's the animation : Sprinkles prank ...
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2answers
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How to animate a character throwing their hat on the ground?

I have a snowman with a hat. Link here: https://www.dropbox.com/s/jji57qkhwe3yhhp/robotHat3_childOf.blend?dl=0 I want to animate the snow mans hand grabbing the hat and throwing it on the ground in ...
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Gravitational Orbit

I want to make a gravitational orbit simulation using the python interface on blender. I want it to be realistic (kepler orbits). The path should be ellipitcal with the sun at one of the foci and the ...
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1answer
22 views

Guided liquid Simulation

I am a short movie director and after effects vfx artist and I'm just beginning with the blender vfx game. In an upcoming short movie I want to realize a scene where the blood flowing out of a ...
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28 views

How to animate ribbon unfurling?

I have to animate ribbon unfurling an box opening. Like below. Got the box part down, but I'm stuck on the ribbon. What would be the best way of going around it the ribbon. Would it be best done with ...
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Deforming a mesh to other mesh

I'm attempting to make a mesh bend (like a stiff plywood plank) to conform to several constraining meshes. The purpose is to "skin" an aircraft fuselage, over the rigid frames of the aircraft body. ...
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1answer
7 views

2.79 Hair dynamics bake didn't write in cache

I have a big problem with particles cache, when i try to bake my hair simulation, it calculate normaly, but after ended (and it's long) i see 0 frames on disk and my disk cache weighs 1 ko. I try to ...
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1answer
45 views

Convert physics to animation keyframe (Actions) in Blender

Problem: I am trying to create a character in Blender and import it to unity. The character is like a blob, who has no bones for animation. I create any Entry animation like this using Physics in ...
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How could I create a sand dune animation?

I've been working on creating a whole bunch of nature animations and one that I've been trying to create is the "windy desert". Is there any way that I could simulate this in blender. To be more ...
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1answer
31 views

Smoke trail Effect particles not showing up in image render

I have created a particle system but when I try to render an image none of the particles show up. Only the plane used as emitter is rendered. The particle circles show in 3d camera view but not when ...
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Smoke trail Effect - emitting from animated object and fadding over time

I would like to add a smoke trail emitting horizontally from the exhaust pipe of my moving object. I want the smoke to fade out over time/distance and to follow the motion path of my object. What ...
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1answer
16 views

Flag Physics seems fine when on the viewport but looks messed up when rendered

I'm fairly new to blender and I've come across this issue. My flag with wind physics seems fine when I animate it on my view port using collision physics. Here's a sample: https://imgur.com/qmJvESK ...
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1answer
25 views

Natural movement to polygon Hair

I'm trying to make a polygon type hair, which moves as naturally as in the first gif, but it doesn't see like it and it doesn't stay in its place, (I used the softbody for the hair anyway) is there a ...
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How to fix blocky shadows on object? [duplicate]

When I render this flag I made, the contact shadows are extremely blocky. I am very new to Blender and 3d modeling as a whole, so I only know the basics and don't know how to fix this. I'm using an ...
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12 views

Casting lines on terrain

I have a DXF file which is a 2D file (all lines are on one layer), and I have a 3D terrain model. I'd like to cast these lines on terrain (to keep X,Y axis, and stretch with Z axis automatically). I ...
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I'm having trouble with the fluid physics in 2.79

I am attempting to make a running tap for an interior model, but i am having troubles with the actual physics of the water. i have applied all of the fluid physics to the inflow, the obstacle (the ...
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39 views

How to animate object hanging from a string?

I'd like to animate this model so it acts like its attached to a car mirror, with proper physics of course (swinging, and rotating enough to see both sides). I'd also like the top of the string to ...
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Cell Fracture - How to have long shards radiating from center of object?

Would like to cell fracture a cube and have the shards radiating from the center of the cube to the faces in single long pieces, is this possible?
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Trouble making an Xwing aim with a crosshair and sight

I have been working on a flight simulator game for a while now, and have run across a problem I can't figure out. The spaceship is an x wing and I have all the logic with shooting and all that, but I ...
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My Cloth physics glitch my object

So, it may just be that my poor computer can't handle this amazing program, but every time I try to add cloth physics to my model's clothing, the clothes spaz out. This is the mesh: This is what it ...
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2answers
74 views

How can I create a realistic floor water fountain

I am trying to create a water fountain (as shown in the image). But for some reason after baking, all my inflows (UV sphere) are being interacted with each other ending up in a mess just like shown in ...
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1answer
38 views

Why are my soft body objects doing this?[Blender 2.8]

so basiccally, I want to recreate some things I made in v2.79 and can't. Now when I attempt soft body physics they always end up like this. Here's the blend file if you need it: The image and file ...
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Collision and Physics - Collision isn't working corecrtly [duplicate]

I made a flag pole and the collisions aren't working as it should. The flag literally gets sucked into the flag pole. + I added wind force so it flaps around but it still keeps sucking inside the ...
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Blender - Python : Plotting/Animating 3D Vector Fields (Representing Spatial/Temporal Variable Field Equations in 3D)

Field equation results are best visualized in 3D. Plotting these using matplotlib is trivial, but creating an equivalent in blender seems daunting. Is there a library/add-on or simple solution to ...
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One-Way collision / One-Sided collider

I try to fill up my mesh with particles(molecular addon) falling from top. What I would need is an one-way collision to "trap" the objects inside the mesh and form the shape if something like this is ...
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How would I simulate a rigid body that's connected to a cloth?

I want to simulate a hammock, and I want to make some metal loops to go in the fabric of the hammock. I don't want the loops to be simulated as a cloth like the fabric; I want the metal loops to have ...
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dependency cycles in animated physics

I have a recurrent dependency cycle when I launch a script to run the physics engine : Dependency cycle detected: OB0092.001/Transform Component/TRANSFORM_FINAL() depends on OB0092.001/...
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Modify location data for physics animated object

I have a "coin" standing on a "table" which is being spun by the use of two projectiles, hitting opposite edges of the "coin," like the action fingers would have when spinning a real coin. The "coin" ...
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1answer
184 views

Is it possible to create vector fields based on a math equation?

If creating a vector field based on an equation is not possible, how create an equation-free 3-D vector field in blender? The arrows should have color based on the magnitude of force they exert on ...
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1answer
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Blender Physics constraint implementation sources

I wanted to know where exactly in sources, Blender implements the Bullet Physics for its rigid body constraint solving. That is, where does it pass the arguments such as Rigid Bodies, their ...
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Blender Cloth, Single object with two meshes, wanting to keep them joined for first few frames of cloth physics

Hello fellow Blenderer's I am working on a small project where I have a character eating and when the food moves away from mouth I want to form a string of dribble that stretches then separates in ...
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How do I scale physics simulations to match the unit scale correctly?

I'm trying to scale the physics simulation to match a unit scale of 0.01. But the simulation becomes unreliable with collisions and so on if I crank up the gravity to 9.81m/s^2 (scaled by the unit ...
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1answer
42 views

Objects Not Really Deleted?

When an object is deleted from the scene, is it still present somewhere in the Blender file? For example, I've been playing with physics constraints, so I created and deleted a bunch of cubes. So now ...
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How can I make physics objects react to keyframes?

I'm trying to make a few objects fall using physics, then have a ramp come up and push them away using keyframes, but they don't react to it. Is there anyway I can fix this or another method I could ...
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1answer
60 views

How can I hang an object on a rope or cloth simulation

I have created a spider's web with cloth simulation, which works well. I now want to hang objects on this web and simulate the weight of these objects acting upon it. How can I pin objects to some ...
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2answers
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I´m getting something weird with my fluid sim

everyone! Im testing for the first time with fluid simulations and i was trying something very simple but im getting a really odd result: I dont know why but my fluid is placing above 0 in Z axis. ...
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21 views

Cloth Simulation not touching the surface

I'm having a problem with cloth simulation. The surfaces (the bowl and table top) is with Collision for Physics. And the cloth is with Cloth Simulation. The problem is that the cloth is not ...

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