Questions tagged [constraints]

Constraints are object features, they control in various fashions the object's transform properties such as its position, rotation and scale. Use this tag for questions pertaining to constraints and their usage within Blender.

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How to make one bone "push" another?

I'm very new to Blender and try to learn to make some stuff. This is what I have as an in-progress "proof of concept": Three cylinders(top, middle, bottom) linked to three bones. All bones ...
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92 views

Point particles to empty

I am making a colosseum with a crowd inside. For the crowd I am using an emitter and I have a few very low poly people objects in a collection. The problem I am having, is that they are all facing ...
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1answer
596 views

Why does my camera start rotating randomly when following a path?

I have a camera that follows a bezier curve with a Follow Path constraint, with a Track To constraint that follows an object (named "Viewer") moving on another bezier curve with another Follow Path ...
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142 views

Is there a way to change the number of significant digits shown (for the follow path constraint)?

I'm using the follow path constraint on a very long path. I would like to see the offset with more decimal places when I'm changing frames. Is there a way to increase the number of digits shown? If ...
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1answer
462 views

Camera track to constraint in the game engine

I have tracked camera to track a ball. When I move the ball manually, the camera tracks it. But when I apply motion using w,a,s,d keys to move it top, left,down and right, the camera stops tracking ...
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1k views

How to Move Bone Joints in Pose Mode like in Edit Mode? (without scaling)

I wonder how to move bones in pose mode like as you would grab the tips in edit mode and move them but without scaling the bone. Tried to set this up with damped track or ik rig. At both the target ...
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266 views

How rely the orientation of an object facing the camera to the side it's looked at?

Use case / goal See the images below. The green plane is attached to a target, the grey sphere, and is facing the camera, but its orientation change depending on witch side of the target the camera ...
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353 views

Can NLA strips be combined by transform matrix?

When I add two action constraints to each bone in an armature, they combine as expected and as described in the wiki, that is, translations are added, rotations are "added" (whether Euler rotations or ...
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302 views

Soft body cloth meshes being affected differently to each other

I have created four objects using soft bodies to simulate cloth which are being affected by force fields (wind) but two are behaving abnormally and I do not know why. I have posted images (click for ...
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25 views

Align Camera Angle to Averaged Normals for Small Area Below Camera

Background: I have a large terrain mesh (~6M vertices) which I would like to "drive" over with my camera. The mesh was sourced from a high quality physical terrain DEM. I am using the ...
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26 views

Armature with multiple root pivots

I am currently trying to rig a skateboard as realistically as possible. I want to be able to move and rotate everything with the Root bone (the object / "skateboard" in the picture is ...
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37 views

Array animation along path

I have a single curve object and while I can set an array of objects to follow the path, I seem unable to combine this with a Follow Path constraint (as I wish to have them follow that path animated). ...
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36 views

How to make two objects acting like parenting to each ohter?

I understand parenting two objects Circle A to B Circle B to A will result unwanted behavior. But let's say I want when Circle A rotates, B will follow, and it should work the same when Circle B ...
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Hi, Is there any way to know how many objects are referencing other object?

Example- I have a object named Master. Master object is used as a reference in many drivers and constraints(like master object rotation is used in some driver and it is also referenced in constraints ...
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64 views

Pole target prevent IK restraints

I'm trying to rig a character and I encountered a rather annoying problem: I followed tutorials to create IK and pole targets etc And it work fine, except: if I use pole target the IK constraints will ...
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294 views

How to use "Context Override" on the "Disable and Keep Transform" operator?

I am trying to make a simple panel with buttons for snapping bones between IK and FK configurations, and I need to change attributes of bone constraints with python scripting. I can quite easily ...
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22 views

Constraints don't work on curved arrays

I'm trying to do some curved arrays: I need my duplicates to rotate ONLY horizontally, following the direction of my curve (Image green). I set the twist method of the curve to "Z-Up" which prevents ...
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421 views

What is Local space in constraints?

According to Blender's manual: Local Space is the parent of the object (or bone) is the frame of reference. Location is relative to the parent object origin. Rotation and Scale are oriented to ...
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47 views

Forcing two cylinders to touch when modeling

As the title said: how do you force two cylinders to always touch while modeling. What I want to achieve is that I can move or rotate one of the cylinders during modeling, but with a constraint so ...
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203 views

Can I use offset instead of y to map texture in displace modifier?

I'm animating a fish to swoosh around as it moves forward using a displace modifier (like here: https://www.youtube.com/watch?v=58lc8sLpJzY). The problem is that I want it to go in a circle using a ...
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1answer
93 views

Is it possible to constraint an object on a vertice?

Is it possible to contraint an object on a vertice instead of the entire object? Like an arrow on a body. Or to a face, so that the constraint object would move according to the face's normal?
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41 views

How to constrain vertices of an object to tracked point

I have a video where I'm moving my fingers around (4 points) and what I want to achieve is having an object whose vertices I want to move using my fingers. I already set up the tracking of the points ...
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1answer
57 views

Pause in relationships and constraints

I want to talk about relationships between (for example) two bones. There are two bones (A and B), bone B has a Cconstraint, bone A is the target of that Constraint. Let the Constraint be "Child Of". ...
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163 views

Stretch or extend curves dynamically based on mesh translation (or rotation)

I recently started using Blender for a project involving multiple cables (or ropes) connected to the same object. Let's say, for instance, this is my set-up: - two cylinders containing a rolled-up ...
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90 views

Limit rotation doesn't work properly

I'm working with car animation. I parented brakes to the wheels and add "limit rotation" for X and Y axis And its work fine when car moving along -Y direction But flickering from 0 to 180° on z axis ...
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335 views

How to constrain hair particles to an object

I'm looking for a way to modify hair particles similar to an armature system or the mesh deform modifier. In the screenshot below, I need the ends of the hair particles to follow the object. Is there ...
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134 views

Copy rotation From child to parent without IK

I made a constraint on the shoulder bone of my character so that when the forearm bone moves, the shoulder follows the rotation with 50% influence. But it causes a dependency cycle and the movement ...
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2answers
1k views

Move/rotate object depending on another object

I have an object Cube with copy transforms constraint targeting another object Empty. The constraint is disabled, so when I ...
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0answers
203 views

robot with scissor lift legs, problem with constraints and parenting

I'm trying to make a robot with legs like a scissor lift, so that it can stretch up. I'm using constraints to control the legs stretching. the rotation is controlled with a copy rotation constraint ...
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807 views

python: get global position of parented/constrained object

I'm trying to find a solution to this other question I have. How can I get the global position of an object, that is either parented to another object (i.e. the child's global position) or has its ...
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827 views

Removing constraints & adding objects to group by python

I have a very basic script which I hope to do a couple things at once, but I am stuck at removing the constraint, and the group_link fails. bpy.ops.constraint.delete() and obj.group_link(group='...
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935 views

Multiple Limit Distance Constraints

I will say that I've looked at a question called, "Distance constraints between objects/vertices/edges," but it didn't help. I am not sure if this is a known bug or if it is meant to be this way, but ...
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612 views

Rigid body constraint not working

I want some physics with movement in the z and without rotation in the x and y. (SO basicly 2d physics). I added a rigid body constraint but for some reason it is not working and I can't figure out ...
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301 views

How to make gear constraints that work both ways?

I have this gear setup: I call the top gear the Rack and the bottom gear the Pinion. I can set a Transformation constraint up so that if I spin the rack, the pinion spins too (in the correct ...
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332 views

New BGE mouse look actuator causing camera shake

Bone-parenting the camera to an armature being rotated by a control object with the “mouse look” actuator on it causes the parented mesh shake all over the place, at least in my experience, I'm on 2....
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246 views

Animating wheel rotation with transform constraint to a proxy rigid body

I'm animating a car to collide with some passive object. The car is parented to a proxy rigid body object, which I'm animating for the first part, and then the animation is turned off so the physics ...
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163 views

Camera object askew (does not match pose specified by its global transformation matrix)

I ran into a (to me) really strange problem. I have a camera that is located at the origin. With various constraints I animate the camera's path to be that of a kite flying an 8 shape pattern (so it ...
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36 views

Its there a way to connect some bones when the are in different armatures?

I have a model which has some parts like the hair and the body separate, and I even have some different bones that are connected to each object separately. Now I need a way to connect them while the ...
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381 views

Blender's IK seems to ignore the Inherit Rotation checkbox, how do I work around it?

Here is a .blend file I've created to illustrate a strangeness I have observed with blender's Inverse Kinematics solver. Example 1 has an IK and the pre-yaw bone has no IK rotation restrictions. ...
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23 views

Ratchet Wheel - Lock a direction

how to lock the rotation of a ratchet wheel in one direction? Edit: The ratchet is part of a gear train and is driven by a driver which has random positive and negative rotations. My goal is it only ...
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Bone constraint [x]transformation & Object [x]transformation

I am having trouble with xTransformation on Bone Constraint. It is not behaving the way xTransformation on Object Constraint behaves. Object Constraint/ xTransformation works the way I want: The ...
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1answer
18 views

What is the way to get location of the animated object

I have an object animated using "Transform cache" constraint. It is moving around the scene, but it's world location and rotation always stays the same. I assume this happens due to some ...
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17 views

How to move a joint in a rig using Parenting to anything? See Image

Please help. This is to cleanup fk legs
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1answer
29 views

Follow path object goes to infinity and wont stop

I have been struggling for the past 2 hours to make an object follow a path. The problem is that the object doesn't stop at the end of the curve (doesn't matter if I use path or Bezier) it just goes ...
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1answer
31 views

Smoke from ship's chimney Smoke should move with the ship

I want the smoke from the chimney to move along with the ship. With "Copy Location" and "Offset" checked, I can position it accordingly and the smoke goes with it. Now I would like ...
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0answers
16 views

Loop through a collection of bezierCircle [Python]

I have this code: ...
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11 views

How to copy constraint to other object and keep the drivers?

I add a constraint to an object, and in the parameter i attach drivers. Now when i copy/paste this constraint to other objects, all the drivers are gone. The drivers are converted automatically into ...
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27 views

How to stretch out animation time for a volume object

Blender volumes are great; particularly when I've got a scene (as I do right now) with a number of fluid effects going on. I can simply save them into a directory as a bunch of OpenVDB files and ...
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55 views

Constraints for mechanical linkage -- linear to rotational

I'm trying to model a mechanical linkage using constraints and drivers (not rigging). In particular, I have a shaft (orange) that travels linearly, and it drives a pinion gear (purple) to rotate. I've ...
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21 views

Child of constraint two hands problem

Working on this fps animation and im trying to get the left hand to hold and move along with the gun like the right hand, but the gun bone has already been set a constraint for the right hand. The gun ...

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