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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.

203 questions with no upvoted or accepted answers
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4
votes
1answer
99 views

Maintain equal rotation on multiple objects

I am making a model with gears. I want to be able to turn any gear and have the others follow. Using constraints or drives only one gear will rotate (and the other will follow). Is there anything I ...
3
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0answers
81 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 ...
3
votes
1answer
339 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 ...
3
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0answers
260 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 ...
3
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0answers
285 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 ...
2
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0answers
17 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 ...
2
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0answers
29 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 ...
2
votes
1answer
42 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". ...
2
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0answers
110 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 ...
2
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0answers
53 views

Automatic Door closer - Constraint problems

I'm not very successful with a automatic door movement with constaints. Below you'll find some images where I'll try to explain the matter. Yellow automatic door closer, it has a motor and it turns ...
2
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0answers
62 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 ...
2
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0answers
176 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 ...
2
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2answers
567 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 ...
2
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0answers
552 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='...
2
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0answers
465 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 ...
2
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0answers
259 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 ...
2
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0answers
324 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....
2
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0answers
231 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 ...
2
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0answers
135 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 ...
2
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0answers
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 ...
2
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0answers
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 ...
2
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0answers
339 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. ...
2
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0answers
290 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 ...
1
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0answers
27 views

Actual Constant Offset for “Follow Path” Constraint

Actually quite an easy problem, but I seem to be unable to find any solution for it. I want to move objects along curves while moving the camera on another curve pointing at the objects; for this, I'...
1
vote
1answer
53 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 ...
1
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0answers
27 views

Camera to follow path of curve starting from exactly where it is currently

I need my camera to follow the path of a circle curve. However whenever I do this it creates an offset because of the cameras location as I understand it. When I go to reset the cameras location it is ...
1
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0answers
46 views

Use multiple Child Of constraints in one bone and animation

I have a model and rigged this model then i added 2 Child Of constraints to one of the bones and in timeline i want to change parent but when i do this , bone and attached mesh go to other place and ...
1
vote
1answer
54 views

Rotation problem with Action Constraint

I would like to trigger an action that I created earlier on a bone (Drumhit on the upper arm bone of a drummer). The action would be triggered by another bone of another armature (snare on Drumcontrol)...
1
vote
1answer
65 views

Limited bone doesn't rotate on a plane

(check this video for better visualization of problem) A bone with a limit rotation constraint doesn't rotate on a plane. Why?
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0answers
19 views

Mute/unmute IK via Python API

I'm trying to mute/unmute an IK constraint via Python, but unfortunately the change is not applied. ...
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0answers
69 views

Is there better way to rig this mechanical object?

I have an object consisting of 4 tubes and 4 pivot points. I'd like to be able to "skew" the object like this (it can only skew left/right, not in the third dimension): I managed to get it working, ...
1
vote
1answer
351 views

Inverse Kinematics constraint with pole target

Salutations, I am currently trying to make a rig for a project involving 2D planes to create some kind of equivalent of DragonBones in Blender (I'm working on Linux and DragonBones isn't available ...
1
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0answers
42 views

Spline IK gets disabled on random frames (new depsgraph) / bone drivers get updated too late

I’m trying to get my Spline IK working. It’s behaving the way I want to, except for random frames where it looks like the Spline IK doesn’t get applied to the bone chain and the bones go back to their ...
1
vote
1answer
91 views

How to get an empty tracked by a camera to move smoothly between keyframes

I have constrained a camera to track to an empty, and I've constrained the empty to limit its distance from the camera to outside 5 m and inside 10 m. I have parented the camera with the track-to ...
1
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0answers
18 views

Constrain two parts to slide against each other?

I have a model of a machine that needs revolute and prismatic (or slider) joints. The revolute joints are each a pivot with one rotational axis. The prismatic joints are each a slider with one ...
1
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0answers
495 views

About local space in action constraint

As you can see the picture below, if you change the rotation value by rotating the parent object (box), the rotation value of the child object (monkey) is retained. Child objects have their own local ...
1
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0answers
47 views

Rigid Body Constraints Rapidly Twitch

So I'm trying to make a simple car with rigid body constraints, but when the wheels spin they rapidly twitch around. Any help? Everything else works but I can't figure out this.
1
vote
1answer
195 views

Copy rotation constraint adjusting influence doesn't work

In the gif below, I applied a copy rotation constraint to the lower bone of the upper arm. It is copying the rotation of the larger bone directly on top of it. While the influence is set to 1.00, it ...
1
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0answers
133 views

Object doesn't get motion blur in several frames

I made a robot animation with IK rig. After rendering, as you can see on image 2 & 4, the robot didn't get motion blur at all but the furniture still get the motion blur. image 1 & 3 works ...
1
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0answers
47 views

How to make arrayed objects have independent rotation

How should I go about making an array (Modifier) of objects have independent rotation? The base has a "Locked Track" constraint to an empty, but if I move the empty (to move rotate the base) it only ...
1
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0answers
21 views

doubt in rigging

In the image 1: How can I move the "con eye" under "con root" since in Unity I can only select one root bone? In the second image I can see many con cheeks, con teeth, etc. in the dope sheet, but I ...
1
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0answers
82 views

Snap an empty to a bone's coordinate, quickest way?

I'm doing a ragdoll system with lots of rigidbody constraints. I use empties as constraints, which will be snapped to the location of a bone. The problem is that my armature has too many bones and I ...
1
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0answers
370 views

How can I attach an object on another object?

I'm trying to attach an object to another object. In my scene I have an object that must follow a rig. This object should get a glare effect, which is why I can not join the object with the rig. So ...
1
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0answers
14 views

How to make a Jump Out Box with Constraint and Physics

I am making a Jump Out Box which want to prompt a Ball/clown from the box. I am currently using SkretchTo constraints on a mesh called "Spring". However, it is not as real as i expected. when i ...
1
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0answers
123 views

making a character mesh collide with surfaces

I'm wondering if there is a way to make it so that my character mesh collides with all other surfaces in the animation process so that i don't accidentally put feet through the floor or fingers ...
1
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0answers
214 views

Most elegant or simple way to make a train follow a curve?

Rigging a train on a curve has it's problems. The cars have a fixed length and the tighter the radius of the curve, the more the car will cut corners. So a fixed offset will be too long. My current ...
1
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0answers
118 views

Impossible to restore armature's pose

I want the pose to be identical as the rest pose. I've cleared all transformations of my armature in pose mode but it's still not the same as the rest pose. I'm sure it's related to specific ...
1
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0answers
107 views

Objects snap backs to its original position halfway through animation

Link to my blender file.https://drive.google.com/open?id=1WApKxEItBW1lrh2O9S3e7V1lGQ0xU3el The cube snaps back to its original postion halfway through animation. I am using transformation constraint ...
1
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0answers
332 views

How can I get text to “snake” along a path

I want to get my text to both move and deform ("snake") along a path. I can get either of these to work but not both. Here is an example of using the Follow Path constraint on the text: And if I ...
1
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0answers
52 views

Maintain volume bone constraint 2x too big

I'm using Blender 2.79 and have a pretty plain scene. Cube (2x2x2) and a plane. I added vertex group called cube to the cube, assigned all vertices to the vertex group, added a single bone, called ...