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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11 views

Can I transform an object rotation while the animation is playing?

I got a simple car. The front wheels are independent objects, linked to the body with a generic spring. I want to change the frontwheels Z-rotation to change the driving direction. The wheels are ...
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15 views

Armature bone glitches after 180 rotation with copy rotation constraint

Setting a copy rotation constraints influence to a number like 0.200 starts snapping the bone weirdly after passing 180 degrees of rotation. How can I fix this so that it keeps adding rotation?
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How to switch between fk and ik when they are separate armatures?

I have a model that I want to be able to switch between IK and FK. The ik and fk bones are two separate armatures but connected through bone constraints. How would I be able to switch between FK and ...
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11 views

Digitigrade leg rig flips 180 when pulled backwards

as I was setting up and testing the constraints for a leg rig I noticed when I pull it back it would flip around in a 180 which is not what I want to happen when I pull it back. How do I keep this ...
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20 views

How can I preserve the surface area of a mesh while editing it?

I'm trying to model a coat and I'm having difficulty creating folds while preserving the surface area of the mesh. Is there some sort of way to restrain the amount edited within the original surface ...
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Armature bones with two constraints snap to unwanted angles

I have 3 bones. Let's call them 1st 2nd and 3rd. No parents. Now 1st has two CHILD OF constraints set to follow 2nd and 3rd. Rotating these bones works until I set both of the constraints influences ...
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1answer
21 views

Translate/Scale/Rotate along single axis using MMB jumps around erratically

I know I can constrain a translate/rotate/scale operation along an axis by holding MMB and also holding X Y Z But when I do that, the selected element jumps around erratically (along and outside the ...
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30 views

Animation Nodes - How to access individual items within instanced collections?

I have a spline with an empty following along it using a Follow Spline Action node. Then I have a mesh object with a Curve Deform modifier binding it to the spline and a Copy Location constraint to ...
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33 views

I can not get “track To”constraint to work on my eyes

I have bones in the eyes names Eye.L and Eye.R I have bones in front of the eyes marked Eye_Look_At.L and Eye_Look_at.R - The course instructor says to add a "Track To" constraint on the Eye....
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Bone IK Constraints - Bone Transformation Data

I create animations on Blender and export the keyframes using custom plugin to be used in others appliances. In order to run the animation on other programs, the transformation data recorded on the ...
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1answer
16 views

Object tilts along animation constraint path [duplicate]

I have attached an object along a constraint path, When the path is flat the object follows along accordingly. I then make one point elevated so the object can heave then dive along the path. All up ...
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I cannot keyframe child of constraint

I am trying to make an animation of a character riding on a helicopter, then jumping off. I have the bones of the character attached to the helicopter with a child of constraint. The animation starts ...
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33 views

Armature not following path for animation

I'm very new to blender - i've basically made "the doughnut" and a bunch of apples. I'm doing first solo lego project and blagging my way through. I've created an armature and mesh and ...
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19 views

Parenting Lattice with Constraints to an empty

I am trying to animate a train that I got pre-rigged from Blendswap. I got the wheels to turn properly but am having trouble with some parts following the mesh (see video below). I found that when I ...
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My character is rigged and armature works well except its unstable

Some bones occasionally move in directions (basically middle spine bone out of three spine bones(pelvis included) which has IK applied) and it is different or not happening every time I view it, it ...
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2answers
81 views

3 part mechanical joint following 1 bone?

I am making a 3 part mechanical joint, with the different axis of rotation being in 3 different places. This is fairly easy to make a basic rig for: The problem is that i'd like to control this with ...
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1answer
37 views

Controlling object visibility with distance to other object's vertices

This is my first post so please forgive any noobish errors. Here's the problem I'm trying to solve. I have a grid made up of hexagonal meshes. I have a cylinder that's either going to translate across ...
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3answers
421 views

How to constrain two objects to face each other without a dependency cycle

Logically, to me, a Track To constraint affects and objects rotation to point it to a location. So if two objects are always trying to face each other, this shouldn't create a dependency cycle issue. ...
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28 views

Bone Rotation results in object being Flipped / Mirrored

I'm animating the fold of a paper object. I added a Child Of constraint to the objects, and the target is a bone. The bone is parented to the next object. When I go into Pose mode and rotate the bone, ...
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33 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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Replicate Curve Constraint on mesh objects that are following multiple paths using animation nodes

I am working in Animation Nodes. I have created a randomly curved "wiggly" Path across a surface. I have made a long thin Mesh object that follows the Path using a Curve Modifier, this ...
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1answer
36 views

How to disable or enable a constraint of a bone, by a rotation of another bone?

I want bone A when starts to rotate, disables a constraint on bone B. (The eye symbol) My guess is by using a driver. BUT, I don't have any clue to do it. Added info: Start to rotate means, when I ...
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33 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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49 views

Bone Turns Orange And Auto IK Doesn't Work

The model's left leg is perfectly fine. I can select the lower leg and with G, move the leg with auto IK. For some reason, when moving any bone on the body, the right leg's upper bone turns orange. ...
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12 views

Write new bone constraint

I have an idea for an IK-like bone constraint solver which I'd like to try. As far as I understand, there is no way to add such a constraint via the python API, is this true? What is the simplest way ...
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1answer
39 views

Bezier Curve as Constraint for Bones? (Rolling garage door)

im trying to build a rolling garage door. To connect my six panels i used bones. Now i would like to define how they can move. I want to use this for animations or stills in different positions. I ...
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1answer
110 views

How can I move separate edges towards each other at the same time?

I know I can move each edge separately pressing the G and then the Y keys but how can I move the edges toward each other at the same time? After the edge move it would look something like this.
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40 views

Is it possible to make floor constraint base on surface detection?

Let's say I created a plane as the floor And then I created a cube. Instead of detecting the center of the cube against the floor, can blender use the surface of the cube.So whenever the surface of ...
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1answer
41 views

Constrain point to surface

Is there a way to lock a vertex from object1 to the surface of object2? More specifically I am talking about the end of a spline which should be locked to the surface of a mesh (not only a single face ...
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2answers
181 views

How to make non-linear movements with a Follow Path constraint?

I try to achieve a non linear movement with the Follow Path constraint. I linked my object to a bezier circle using the Follow Path constraint. It follows the circle with a linear movement, meaning ...
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22 views

How to limit velocity on an object (Sphere)

I am new to blender 3D animation and I'm trying to create a basic animation using multiple spheres. My spheres animation has to respect a few constraints: Each spheres has to keep their distances ...
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1answer
42 views

How do I center an object in its parent?

I have 2 objects. Their dimensions are completely identical. I have applied all transformations, rotations and scales. Their locations are 0, 0, 0. I have tried parenting the objects, both in ...
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1answer
26 views

What bone constraints should I use?

I'm trying to setup rigging a scales. I have 2 main bone (pan and indicator). I want indicator to rotate when pan move up - down and I even want indicator rotation makes pan move up - down when I ...
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15 views

bone constraints get messed up when baking animation

On the video, you can see I have selected the bones which have weightpaint (I think I have all of them, I did it by hand...) from my blender humanoid rig. I also have bones for the swords of the ...
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1answer
48 views

How can I populate a model with smaller models?

My mission here is to use this Atlas model as a rough container of lego figurines. There are at least two sub-objectives that need to be accomplished: Fill Atlas object with particles represented by ...
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27 views

Don't let FK arm controllers clip through objects

I'm having a bit of a hard time with a lot of animations which involve sitting people on a table. Problem: I want the table to be no passable by specific FK controllers, like the hands (and maybe also ...
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2answers
76 views

Spheres facing to camera

I need those spheres facing to camera so I can see the letters all the time. I guess I need to use constraints but not sure how (I'm a newbie, yes) EDIT: I know Damped track do it but I need it in all ...
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16 views

Constraining axis on rigid body

I've been trying to roll a sphere down a slope and I want to constraint axis of rotation (so that it doesn't veer off course) but adding rigid body constraints (generic) or regular object constraints (...
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1answer
30 views

How to keep certain faces planar while decimating mesh

For a papercrafting application I need to decimate (collapse) the geometry in order to reduce the number of faces. The original geometry looks like this: When applying the decimate modifier (with ...
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23 views

Access to constraint modified value

I modelled a window and add an armature to it. There is a bone called Window that's used to open the window and a bone called ...
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44 views

Child of constraint with bone is not following the parent

I'm doing a simple ball pitch animation. I tried to do child of constraint for the ball to the hand, it works till set inverse step and comes back to its original place. But when I try to move the ...
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1answer
39 views

Copy Rotation Constraint not working when paired with a Shrinkwrap

So my scene is a boat on an ocean modifier. I have a shrinkwrap modifier on a plane, the rough size of the boat, directly under it. Vertex group has been set. Plane is subdivided. Boat is not ...
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28 views

Is there a way to get the shrinkwrap constraint to move the target to the object rather than the reverse?

In the image below there's a cuboid that has a shrinkwrap constraint to a distorted cylinder. As I rotate the distorted cylinder in the x-axis, the cuboid moves up and down following the uneven ...
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12 views

Getting Copy Transforms + Stretch To to work consistently during a render?

I figured out this way of making things slightly lag behind. It's quite nice and easy to set up, and I can move stuff around in real time. Everything would be alright, but the system simply does not ...
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1answer
32 views

Objects tracked to camera track to the viewport camera at current frame instead of camera location at the frame it should be rendering

I've created some text objects and to make sure they are always facing the camera I have them tracked to the camera with some constraints. I've tweaked the constraints until it looks fine in the ...
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1answer
47 views

How to remove IK Target after a certain point without breaking the animation?

I'm creating a siting animation for a dog, I used a IK target to lock his his right leg to a specific location when i was animating his left leg. everything is fine and animation is going how I want ...
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1answer
93 views

Active dynamic rigid body object does not move since linked to armature

i have tried everything and it does not move as an dynamic active object. clear parent does not help. it has an "child of" object constraint: There is no passive object. at least not yet. ...
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17 views

How do I set an object to move along an axis by changing the rotation of a different object?

So I'm trying to model an aperture like shape, and am setting up constraints to go along with it. After a long bit of trial and error, I found out I could use the copy rotation constraint all set to ...
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30 views

Action Constraint won't select Action baked from Copy Transform (2.8)

I'm trying to turn a mesh's action into an action that corresponds with a bone in my rig. I duplicated the bone in Edit Mode, separated it into it's own separate armature. We'll call this RefBone. I ...
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33 views

How to make that wheel follows road bumps

I'm working some simple project where I have a car which driving on road. Road has bumps. Of course, as rookie amateur :) , my wheels sinking into bumps. I tried various methods I found over internet, ...

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