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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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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
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 ...
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 ...
18
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 ...
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 ...
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 ...
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 ...
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.
2
votes
1answer
753 views

Uneven movement on camera following a path.

I render a short movie. I set the camera to the circle curve to make it fly in circle. The problem is after render, the camera is a little shaky. Can anyone help me? Thanks first.
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 ...
3
votes
1answer
4k views

How can a path animation be used as an action in the game engine?

I animated a rollercoaster using a Bezier Curve and a Follow Path Constraint affecting the vehicle. Then I tried to use the automatically created action in the game engine but the Action Actuator has ...
4
votes
1answer
1k views

How to get the physics engine to wraps a string around the moving part of a motor constraint?

I'm trying to simulate the physics of a string that wraps around a motor spool when the motor turns. The body of the motor and the shaft+spool defines a motor constraint, so a velocity can be applied ...
13
votes
1answer
953 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 ...
3
votes
1answer
3k views

How do I get constraints to work in game engine?

In the game engine, my object needs to point at a target. How can I get it to aim at something that is constantly moving in unpredictable patterns? The constraints actuator does not have a "track to" ...
2
votes
3answers
1k views

Precise Mechanical Rigging (Intuitive method)

https://youtu.be/86DtgBiUDvI Hi, I have done this using the y-rotation of the Blue rod to drive its z-location. The Top rod is driven by the z-location of the Blue rod. As you can see, the ...
21
votes
1answer
35k 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 ...
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....
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 ...
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 ...
3
votes
2answers
5k views

How do I make an object move along a path in either direction?

I'm trying to make a garage door open or close by rolling up or down like they usually do. I know how to make an object follow a path in one direction along a curve using constraints, but I need it to ...
3
votes
2answers
901 views

Child Of Constraint Set Inverse with Python

When I try to use the "set inverse" operator in python there comes an error that it missed a context called "constraint". But I did it exactly like in the Info Panel. ...
0
votes
1answer
429 views

Offset object duplicated along path

I have a curve and a sphere, and I would like to make 5 copies of that sphere move along the curve. It's possible to duplicate them along the curve by making the sphere a child of the curve and ...
4
votes
2answers
693 views

Does anyone know how to rig a truck/trailer so that the trailer follows the truck in a realistic way?

I am trying to rig a truck with a trailer so it can be animated along a path/curve. Having the trailer follow is not a problem, but in order to look realistic it shouldn't follow the exact path of the ...
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 ...
3
votes
1answer
621 views

Copy Rotation Bone Constraint not Smooth

I am struggling to get the CopyRotation bone constraint to work as I expect. Hoping someone can clear up where my confusion is. I have simplified my issue to this three bone setup: Bone C is the ...
4
votes
1answer
432 views

How to control object's path follow speed based on its position

I am trying to animate a rollercoaster. For now I have a cube following the Bezier path of the track. I need the cube to change its follow speed based on its height. (the higher it is, the slower it ...
2
votes
1answer
868 views

Setting constraints causes the location of the constrained objects/bodies not be accessible

I set up 2 bodies manually & assigned Copy Location constraint to one with respect to another body. Then I set up the keyframe for the guiding body & then I started to view the change in the ...
2
votes
1answer
286 views

Animating a rolling square wheel effect

I basically want the effect shown in the linked gif, like a cube that roles on the floor and doesn't clip the surface as it moves forward, like a rotating square wheel I can do the automatic rotation ...
1
vote
1answer
55 views

How to keyframe child of constraint in and out

I am dribbling a soccer ball using child of constraint. In the image I would like to keyframe the ball where the arrow in drawn but when I try to keyframe it it still follows the child path, How do I ...
2
votes
1answer
647 views

How to stop Action Constraint giving different results when code is run in text editor vs python console?

I am currently developing a script that I hope will streamline the approach of adding keyframes to existing actions used by action constraints. I am doing this by allowing the user to move an object ...
1
vote
1answer
3k views

How to lock elbow rotation (forward kinematics)

Before answering this question please consider that an 'answer' involving IK bone constraints should go in comments. In this question I am only interested in forward kinematics. Many humanoid models ...
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 ...
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 ...
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'...
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 ...
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...
4
votes
2answers
1k views

Rigging a differential aileron command

A bit of context first. I'm trying to model an RC plane, using blender as a kind of CAD software: In the process, I try to model the actuators, i.e. rudder, elevator and ailerons. I did manage to rig ...
3
votes
1answer
223 views

Synchronize an object following a path and the appearance of the path

Using a Follow Path constraint as well as Cegaton's answer from this page, I am trying to make a path appear behind a car as it follows a path. Unfortunately, the speed at which the car and the path ...
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 ...
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 ...
5
votes
1answer
942 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
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 ...
4
votes
1answer
654 views

Copy Rotation adding rotation to start position?

I am making a rig that transfers motion from one mesh to another via bones. This is for complex mesh hair strands. The base mesh has a cloth sim on it. A Chain of bones are constrained to follow this ...
4
votes
1answer
2k views

Keyframing Constraints - Is it possible?

So, this is all hypothetical. This isn't really anything I am trying to do at the moment, but what I want to know is how to keyframe constraints. Example: Say I have an item that - at some point in ...
3
votes
1answer
415 views

How to constrain an object to a compound child?

I have a rigid-body vehicle made up of parts with compound collision enabled, so that the parts don't collide with each-other (for optimization purposes). I'd like to constrain the rear wheel to a ...
3
votes
2answers
1k views

Do some Bone Constraints only work with Root Bones?

While the Floor and Limit Distance constraints work well with the root bones of an armature. I don't get them to work with other non root bones. Is there any reason for that or do I miss a detail? In ...
3
votes
1answer
790 views

How do you copy things like rigidbody constraints and force fields to other objects?

How do you copy things like rigidbody constraints and force fields to other objects? I made a cell fracture and I would like to give each cell the same constraints and force fields. Thanks in ...
3
votes
2answers
1k views

Scripting — Can't figure out how to use correct contexts?

I'm trying to write a script to create some objects along and around a curve object, set up for a generative modeling thing, to make randomized "tentacles" out of paths. Anyways! I'm approaching this ...
3
votes
2answers
290 views

constraining an empty to the intersection of two coplanar segments

For some reason I have two coplanar segments (each represented by a 2 points path), moving relative to each other in a way that guarantees they are always intersecting. What I would like is to ...
3
votes
1answer
4k views

Have location of grouped objects relative to parent object

I am creating a wall section which will be a wall with a hole and in the hole's place a couple of doors and so on. For ease of putting things in place I first create an empty node. Then add a wall ...