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Questions tagged [constraints]

Constraints are object features, they control in various fashions the object's transform properties such as its position, rotation and scale.

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21
votes
1answer
34k views

Constraint the camera to look at an object

In my scene I have a camera sitting at the origin. I would like to contraint it so that it always looks at the center of a given object. But the camera should not change its position. I found some ...
19
votes
1answer
1k views

How can I make my gear simulation in the BGE work?

I have the movement and rotation restrained properly, but the simulation is not behaving like it should. both objects are rigid body objects. How can I make my gear simulation work?
19
votes
2answers
2k views

How do I rig a BB-8 robot?

I have made a BB-8 robot from the new Star Wars: The Force Awakens movie, now I want to rig it so the head will stay on top when I move the body. Here is some reference footage of what it looks like ...
17
votes
2answers
12k views

Is there a way to convert a constraint to a keyframe?

I have a model in Blender with a full rig, including IK bones. I also have a sword with two bones, on the top bone of the sword I have a set of constraints that copy the location and rotation of a ...
15
votes
1answer
4k views

Animate the parenting of an object

let's say we have a magazine, a gun, and hands. The magazine is parented with the gun. When I make an animation of reloading, I want the Magazine to be a parent of the hand, then after the magazine ...
14
votes
3answers
10k views

How can I make a plane always look at camera? [duplicate]

How can I make a plane always look at camera? Like in old videogames, like Doom or Wolfenstein, this kind of software used static images that always looked at the camera, is this possible to make on ...
14
votes
3answers
8k views

Add object constraint to a number of selected objects

I have a large number of objects, and I wish to add a Track to constraint to each object. When I select the group of them and then add the constraint, it is added to only the active object, of course....
14
votes
1answer
3k views

Kind of “apply” for a clamp to constraint?

I have a low-poly bridge model whose poles are positioned using Clamp To constraints and a corresponding curve: What I am looking for is a way to remove the constraints but to keep the position of ...
13
votes
1answer
949 views

Hook/parent/constrain to particle hair?

Is there any way to hook, parent, or constraint something to a vertex of a particle hair strand? Such as a hair accessory dangling from a braid that needs to move with the hair? Converting the hair ...
12
votes
1answer
437 views

Would it be possible to create a new constraint “type” with python?

Obviously it is possible to add new mesh "type" with python in the list of create mesh. I think I read that it isn't possible to create a new "modifier" type with python. What about constraints type (...
11
votes
4answers
7k views

Three bones following a curve

I have a chain of three bones and I want them to follow a curve (bezier curve). I've tried to do this creating a bone constraint follow path but it doesn't work. I'...
10
votes
1answer
744 views

How to access projected 3d tracks of the camera solver?

For further reconstruction of a shot, I'd like to access the 3d location of the projected tracks by the camera solver constraint in the 3d View for all frames via python. While searching through the ...
9
votes
1answer
5k views

How can we animate a ball rolling over a path?

So I have an complex smooth surface. I created a high resolution path curve and used a Shrink Wrap modifier to make it fit on my surface where I want it. I apply the shrink wrap. I can easily make ...
9
votes
1answer
6k views

Make Camera System Look at Empty

I have a camera System that is supposed to look at the empty in my scene. It should only move, not rotate. It should rotate in two parts. One, the actual sensor body...
9
votes
0answers
188 views

Parenting a mesh to a particle [duplicate]

I have made a character with particle hair. The hair is dynamic and it works fine. I want to attach beads to a strand, so that it moves along with the strand of hair. However, I can not find the right ...
8
votes
2answers
2k views

How can multiple Curves be used to control Camera movement?

I currently use a Track to Constraint to make the camera automatically point to an empty. In an animation the camera is moved along a bezier curve (follow path). How could I change the curve and ...
8
votes
1answer
3k views

Parent two objects, without the child getting moved by the parent

Is there a way to parent an object to another, such that the parent does not move the child when it moves? I thought of adding a "negative" Child-of constraint to compensate for movement by parent, ...
8
votes
1answer
386 views

How to animate an object so it follows the slope (normal) of another object?

I'd like to animate an object moving over a surface and have the object positioned so it follows the slope (normal) of the surface. Using a shrinkwrap constraint, the object will follow the change in ...
8
votes
1answer
185 views

Restrict dimensions of cables

I am creating an animated manual for a device that has an external cable connected to it. The cable has a length (1m) and a diameter. When I bend the cable, I would like to ensure that the length ...
8
votes
1answer
2k views

How to follow a path by curve points rather than length?

I am trying to visualise some physics simulations in Blender. The simulation result is a path that an object travels over time. I am importing the collection of points as a curve into Blender using a ...
7
votes
1answer
31k views

How to IK rig legs

I have a simple character. I would like rig the legs so that I can easily control them. How can I IK rig my characters leg? .blend file
7
votes
1answer
3k views

Camera angle should follow path angle

(I'm a blender beginner but know a handful of techniques with other similar programs/systems) I've created a NURBS to make a tracking shot. Creating a follow path object constraint on the camera lets ...
7
votes
3answers
8k views

step by step description on how to connect two objects with a hinge constraint

Can someone point me to or give me detailed step by step description on how to connect two objects with a hinge constraint?I am not sure which is the target.. the one that actually swings or the ...
7
votes
1answer
614 views

Rigging an umbrella-like object

I'm trying to figure out the best way to rig this setup. I have several pipes arranged vertically, right next to each other. I want a rig where I can use a single controller to have them spread out at ...
7
votes
2answers
1k views

Set resting length for a generic spring constraint

I have a generic spring constraint between two objects. I am able to set the stiffness and damping of the spring, but I would also need to set what length the spring initial was. Blender now wrongly ...
7
votes
2answers
381 views

Linking cell fractured fragments together with Rigid Body Constraints set as 'breakable'

I am learning Cell Fracturing following this video. But just like Mr Jee in the comments section, my model breaks as soon as I play the animation in Games Engine. The author of the video talks in his ...
7
votes
1answer
2k views

How does 'local with parent' space work?

My question touches the mathematical side of Blender more than the modelling one. I am having a problem understanding how the 'local with parent' space in bone constraints works. I have looked ...
6
votes
2answers
7k views

How to copy constraints from one bone to another?

I've created some shapekeys driven by the bone controllers for my character. Then I gave constraints to the bones on the left side. Now I want to copy and paste them to the right side. Two questions: ...
6
votes
2answers
2k views

rotate an object while it follows a path

I am trying to rotate the moons and Planets as they orbit their parent bodies. In a way that does not require the setting up of key frames – jwktrucker You guys have been very helpful and Thanks to ...
6
votes
1answer
2k views

Planes rotating to face the camera, but only along one axis

I'm using planes as labels on a map over which the camera makes a path. The problem is that if I simply have flat labels they don't look good when the camera is low (blue dots in the animation). With ...
6
votes
1answer
3k views

How to make an object's vertex follow another object

How do I make an object's vertex follow another object? (Not to be confused with: How to make the object follow another object's vertex)
6
votes
2answers
1k views

Distance constraints between objects/vertices/edges

While precision modelling, I often encounter the need to use exact distances. Blender's keyboard input is fantastic for this. What I haven't figured out yet is how to keep distances between certain ...
5
votes
3answers
3k views

How can i edit a follow path constraint with the graph editor?

I made a follow path constrait with a curve, does it already have a linear interpolation so i can edit it on graph editor? i need the linear interpolation.
5
votes
3answers
2k views

Is there a way to put a copy rotation constraint with an influence higher than 1?

I'm making a little animation with some gears. I want that if I rotate the first gear, all the gears rotate with the gain given by the gears. For doing that I've choose the copy rotation constraint. ...
5
votes
3answers
5k views

What is Inverse Kinematics?

Why do we need the Inverse Kinematic constraint in rigging? What is the benefit of it, what is a situation where I can use it and what does it do to the armature?
5
votes
1answer
4k views

Pinpoint the area light to object

I've made an object and put an area light on scene. I want that area light points toward the object. I tried to put constraint and PARENT TO OBJECT but that doesn't rotate the light in that specific ...
5
votes
4answers
2k views

Changing ChildOf constraint influence to 0, but keeping the position it had as a child

I had a sword object rigged with a single bone, with a ChildOf constraint making it a child of a sheath (with an influence of 1). Throughout an animation i move the sheath, and the sword bone follows ...
5
votes
1answer
4k views

Follow Path constraint moves object away from curve?

I added a follow path constraint the camera. I adjusted the start point of the path and the location of the camera so that they were very near, but once I set follow path constraint to the camera, ...
5
votes
2answers
393 views

How to animate the visibility of a constraint?

How to animate the "Copy location" constraint visibility?
5
votes
2answers
2k views

Using spline-IK for bones but keeping control over individual bones

My goal is to rig the Ears of my quadruped character, which has huge and soft ears (rabbit-like). I've set up a Spline-IK constraint for the ear's bones chain, and added soft body physics to the ...
5
votes
1answer
483 views

Chain of Hinges Physics

I am trying to model a series of meshes that are connected by hinge points. The idea is that, with some sort of sideways force applied to the first mesh in the chain, the other meshes in the chain ...
5
votes
1answer
4k views

Difference between Ctrl P > Follow Path and Add Object Constraint

I am trying to let my camera move along a path. The method to first select the camera, then the path and then use Ctrl P > Follow Path works fine. However, if I select the object, go to Object ...
5
votes
1answer
4k views

How to pin a distinct bone in a rig while animating

Here is my scenario: A character sitting on a chair is resting his elbow on a table while moving his hand which is controlled by inverse kinematics. How can I stick or pin the elbow to the table ...
5
votes
2answers
2k views

Copy Rotation Bone Constraint fails

When I add a Single Bone and then an Empty object to the scene, as follows: Then I add a Copy Rotation bone-constraint, I set the Empty object as the target, the constraint will rotate my bone on the ...
5
votes
1answer
592 views

Why is the Track to constraint “legacy”?

The tooltip for the "Track to" constraint says: "Legacy tracking constraint prone to twisting artifacts". Why is it "legacy"? Has it been replaced with something else?
5
votes
1answer
166 views

Is it possible to do a radius constraint in Blender?

Is it possible to do a radius constraint in Blender? For example, consider 2 cubes, 1 unit apart, as the following; []--1 unit--[] If we move the box on the ...
5
votes
1answer
376 views

reorder modifier/constraints stack order in python

Is there any way to set a modifier or constraints index in the stack without using bpy.ops? The idea is to easily reformat the stack order of constraint. An example ...
5
votes
1answer
6k views

How to lock object rotation along a path

I'm a little new to Blender and I have an object traveling along a path. However, I need the object to stay locked in a specific orientation while it traverses the path from start to finish. Think of ...
5
votes
1answer
940 views

Is it possible to pin distinct Bones of a Model to a Plane while posing?

I need several poses and would like to know if whether it would be possible to pin the feet or hands of a model to a plane (as floor or wall) while animating excercises like squat or push-up ? If IK ...
5
votes
2answers
1k views

'Child of' Constraint, setting Inverse doesn't work?

I want to parent a mag to the left Hand Thumb but once I target my Armature the mag absolutely changes LOCATION / ROTATION / SCALE this is really weird, I mean even setting it inverse doesn't help. I ...