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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1answer
115 views

Rigging delta arms

I am currently trying my hand at rigging a virtual delta 3D printer in Blender. In it, the position of the central sphere (the printer's "nozzle") should be determined by the z-position of the three ...
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24 views

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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43 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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0answers
102 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
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1answer
384 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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0answers
262 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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0answers
304 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 ...
3
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0answers
292 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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0answers
38 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 ...
2
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0answers
52 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 ...
2
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1answer
28 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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0answers
35 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
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1answer
53 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
133 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
62 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 ...
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0answers
74 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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0answers
248 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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1answer
314 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 ...
2
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2answers
758 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
183 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 ...
2
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0answers
643 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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0answers
516 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
283 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
329 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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0answers
238 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
144 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 ...
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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 ...
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0answers
353 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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0answers
25 views

Bending a bar with a torus attached to one end

I'm an absolute beginner with Blender (5 days so far) and I'm hoping someone can help me. I'm trying to bend a flat bar with a torus attached to one end. I used the bend feature in the "simple ...
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0answers
50 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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1answer
20 views

during copy transform constraint, the child object snaps to the origin point of the parent object

When i use the copy transformation constraint, the child object snaps to the origin point of the parent object. What i want is, when i constraint an object, the child object should remain where it ...
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2answers
68 views

How to keep triangles connected and the same shape, while modifying/transforming?

EDIT: All green triangles should keep the same shape as the purple triangle. They may not deform in any other way than location and rotation. If I work with modifiers the triangles keep deforming. I ...
1
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1answer
39 views

Rotate an object and move up local z axis at the same time

I need to rotate these two objects around the same pivot point with the outer object sliding up it's local z axis and ending up inside the inner object. I have tried using a transformation constraint ...
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0answers
17 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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1answer
28 views

linking rotation + location/trying to rotate a robotic “C-arm” along its “mount”

I really have no idea how to better word the title. I am on my second day with blender and im trying to rotate a C-arm (X-ray equipment) to model real world equipment. I can manually animate the ...
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0answers
27 views

Procedural stairs driven by a curve

The idea is to create procedural stairs that are driven by a 2 point curve (or just 2 empties if possible). The curve/distance between empties controls the amount/length of stairs and the angle. I ...
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1answer
35 views

World Space in transformation constraint not working as expected

Relatively new to constraints and trying to make it so that moving the cube along the X axis makes the monkey rotate along the world's X axis. No matter what kind of combination I choose for the ...
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0answers
20 views

How do I duplicate bones 90° and copy rotation?

I have a set of bones with an Inverse Kinematic constraint. I need to be able to duplicate this set up so that I have four sets in total, each rotated 90° about the center. I'm not sure if this is ...
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0answers
37 views

How to use spring constraint on a moving object?

I’m trying to animate a bike that will be going over rough terrain, and I want the rider’s body to react with physics. I’m trying to use the “generic spring” rigid body constraint, but whenever I use ...
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0answers
66 views

Dynamic object parenting; Does it exist in Blender?

I would like to be able to dynamically parent and unparent an object to another object so that I can freely animate the parented object while it is not dynamically parented. Is their a way to do this ...
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0answers
55 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'...
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0answers
35 views

Constraint grease pencil strokes

I am a scholar of using blender. I have a situation-i'am using a grease pencil on surface and alembic sequence. So here is the question. Can i constraint drawn strokes to mesh for several frames and ...
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1answer
136 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 ...
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0answers
28 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 ...
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0answers
148 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 ...
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1answer
80 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)...
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1answer
80 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
46 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
88 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, ...

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