# Questions tagged [interpolation]

Interpolation is the process of estimating the value of a function based on known values. In 3D animation it is the method used for calculating the in-between positions when animating a character moving between two poses. Blender also uses interpolation for generating geometry and other purposes. Use this tag for questions related to any of the uses of Interpolation in Blender.

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### What Bézier animations can be safely exported to glTF?

Blender supports Bézier keyframe interpolation: glTF supports "Cubic Spline Interpolation". The documentation on this is insufficient for me to understand exactly what they mean. (Are the ...
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### Blender 3 stroke tweening?

I'm returning to Blender after its update from 2.9 to 3. I'm a 2D animator and was very impressed by Blender 2.9's interpolation mechanics - especially it being able to edit strokes down to the vertex ...
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### Is there a way to make blender use slerp interpolation when keyframing a rotation using quaternion?

I'm trying to get constant interpolation between keyframes when I rotate a bone or object using quaternion. I already tried linear interpolation mode, however it still does not automatically give ...
1 vote
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### Geometry Nodes Equation/Method for bouncing objects?

I would like to have a bunch of cubes bounce in a specific space. I have set up a simple equation of abs(cos(x))/x which terminates after 3 bounces. It looks kinda ...
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### Animation nodes vector animation interpolation

Im moving a large quantity of objects from point A - B by animating their vectors in a loop with animation nodes. I have everything setup how I want it to be. But instead of going from point A to B in ...
1 vote
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### Where did Interpolation Modes go in Grease Pencil Blender 3.1?

Just upgraded to Blender 3.1 and cannot for the life of me find the different interpolation modes in Grease Pencil mode. There used to be an options menu with different interpolation modes (sinusoidal,...
457 views

### Geometry nodes vector interpolation issue

I'm trying to translate the vertices of one object in the direction of the nearest vertices of a second object. I know this can be achieved by blending the two vectors using a mixRGB node like this: ...
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### Is there a method to add interpolation between all Grease Pencil keyframes?

In the 3D Viewport, Draw mode, I can use the Interpolate tool (Ctrl + E ) to add a single Breakdown keyframe. Or, I can Ctrl + Shift + E to add an Interpolation Sequence at every frame BETWEEN two ...
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### Sample a grid of points on a selected surface?

I have a cad data imported in blender that includes a surface. My goal ultimately is getting a grid of points on a selected part of this surface, that is an array of 3d coordinates of those points. So ...
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### How do I move a camera using just part of an exponential interpolation curve?

I have a model of a room containing a 1/10th scale model, containing at 1/100th scale model, containing a 1/1000th scale model. I move the camera from a start position - looking in through the window ...
425 views

### Blender for scientific visualization - Point color interpolation from vertex color data based on distance

TL;DR: For a given point in a face/polygon how can I compute the distance between that point and all the vertices on the given face with shader nodes? Overall intent: I want to visualize complex ...
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### Inserting a keyframe for a base color? [duplicate]

I am trying to insert a keyframe for a base color of a material (material #1), but I do not see an option within blender to add a keyframe for a base color. I then want to switch to a second material ...
1 vote
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### Getting "Cannot find valid keyframes to interpolate (Breakdowns keyframes are not allowed)" in 2D Blender

I'm trying to Interpolate two different keyframes of the same Grease Pencil shape. The second keyframe just rotates & moves the shape around. I keep getting "Cannot find valid keyframes to ...
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### VSE Transform Position attribute integer value workaround (2.93)

I just realized that in Blender 2.93 VSE strip transform position attribute is an integer value (pixel value as the picture shows below). Because of that animating the position results a stop/stepped ...
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### Custom animation interpolation without graph editor?

I did a bit of 2d animation and now I am working on 3d animations. In the past one was able to interpolate custom curves in 2d animation. As far as I know this is now gone, or at least I wasn't able ...
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1 vote
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### Different Interpolation Types for Different Bones

Im not sure if this question was asked before, but Is there a way to define the interpolation type for specific bones? For Example, i want to switch the expression of a character in a snappy way, but ...
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1 vote
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### Interpolate changing value with animation nodes

i would like to find a way to interpolate values that change each "random" frames. I can't use FCurve because i don't know the new values and they born from complex function f(obj.location) ...
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### Curved interpolated transition between surface and upright circle

I'm trying to make an object consisting of a curved flat shape transitioning to an upright circle. I already made some edges for the transition profile using curves. If I convert those curves to a ...
100 views

### Constant Interpolation when Auto keying [duplicate]

I would like to animate using only constant interpolation. I know that I can change the interpolation with "T" or going to Timeline<Key<Interpolation, but every time I add a new ...
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### Stroke order for interpolation?

New to blender, so advice is appreciated! I’m in a 2D project and working on a complex shape - namely a hand - and am trying to interpolate it into another pose. However, things turn out wonky during ...
1 vote
192 views

### How to stretch out animation time for a volume object

Blender volumes are great; particularly when I've got a scene (as I do right now) with a number of fluid effects going on. I can simply save them into a directory as a bunch of OpenVDB files and ...
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1 vote
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### Scipy Function as Node (sverchok addon)

I am trying to use the scipy.interpolate.interpn function within blender. I assumed the only way to do this is to utilize the sverchok addon, so my first attempt at using this function is with the ...
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### Tweening drawings in Blender 2D object mode

So this seems like and obvious thing, but It's got me beat, and I've scoured the internet for threads about this problem and I haven't found them. I'm doing a rough frame-by-frame animation and so I ...
274 views

### Why do interpolated grease pencil strokes deform?

I have drawn a 2D Character using grease pencil and I’ve separated the limbs on different layers. When I interpolate the key frames, the strokes will scale or deform in strange ways. I’ve tried adding ...
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### Interpolate movement by incremental steps

I have a question for which I can't find an answer: I would like to move an object from one point to another along an axis, and I would like the movement to interpolate by increments (in my case the ...
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I'm trying to color a cube with its own position in 3D space, which works well with the shader node setup I have, but only sets the colors for the vertices. However, I would like this to interpolate ...
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### Custom heatmap 3D texture

I have a 3D model constructed from photogrammetry. I would like to colorize this based on custom values on some vertices, and interpolate a heatmap for the rest of the mesh based on these values. I ...
1 vote
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### diffuse map bake shows weird helper edge?

So I have an image texture. And I have a (mesh) plane. And I added a material, the above image texture. And I assigned the material to the plane. I made second uv map, and mapped the plane to the ...
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### How to I change the Interpolation Type in the Map Range node like the documentation says?

According to the documentation, you should be able to change the Interpolation Type of a Map Range node. I am on 2.91.2 and don't see it. Is this a new feature that I don't yet have access to? ...
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### Why doesn't blender grease pencil solid fill interpolate properly

I'm kinda noob when it comes to grease pencil in blender, I'm trying to render wavy blocks to maybe use as sprites in a game I'm creating, the strokes seem to get interpolated quite nicely but not ...
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### Rotation problem when using bezier interpolation

I have built an helicopter and I rotated its propeller, when I used linear curve interpolation everything went fine. However, when I changed the interpolation to bezier it keeps rotating back and ...
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### Limitation of a Rolling Shutter effect for propeller

I am trying to create artifacts of a spinning propeller using cycles from this post. I have the propeller animated using 2 keyframes starting at 0 degrees, and ending at 80000 degrees over few frames. ...
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### Generate/Get all keyframes with python

I'm working on a project which requires me to export all keyframes for 1 object (the camera) in a "generated" state, meaning all the control points as well as all the keyframes generated by ...
260 views

### How to smooth out different interpolation types

I am trying to complete a blender animation where a ball rolls down a slope under the influence of gravity. To simulate gravity I have calculated the time and distance the ball needs to travel to ...
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### Blender 2.91 Linear Animation acting like a Bezier

i got a Weird Problem since i updated to 2.91, then i try to loop my animation by changing the interpolation type to Linear the Result almost looks the same as Bezier, i did try it with a new scene ...
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### Interpolating between SVGs

I am very new to Blender. I am trying to create a mesh model to eventually 3D print. I have imported 3 different SVG files, each one is a frame from a video of a running horse. I want to connect the ...
1 vote
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### Sverchok Vector Interpolation Example

Hey I'm super new to sverchok! So I'm trying to learn how you take two lines and interpolate them into a plane like they do in the example within the sverchok docs (https://sverchok.readthedocs.io/en/...
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### Why Bezier Interplation of Blender is not as much dramatic and cinematic as of other softwares?

I am working on a project and when i use bezier interpolation, it looks like linear interpolation in real time with no dramatic or cinematic effects at all on the objects. is there some settings which ...
1 vote
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### How to change interpolation to constant and set motion blur position to start of frame?

I encountered a problem where using motion blur in Eevee causes a render glitch when a Child Of Constraint keyframes are animated. Looking into the problem I found this bug report: https://developer....
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### How to interpolate vertex colors in a cube?

I have this model made out of cubes: And I want to set the white cube some vertex colors, which correspond to the vertex's surrounding cube/cubes and interpolate between them. Note that this cube ...
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### Make object follow moving path!

I need to get an empty to follow a moving path. The path is the guide for a record needle and is a rotating spiral. The empty needs to be still as I will be tracking the needle to it which will ...
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### Vertex color gradient is not linear

I am painting the default cube through vertex coloring. I paint the bottom four vertices as (0.25, 0.25, 0.25) and the top four vertices as (0.75, 0.75, 0.75). When I inspect the result in VERTEX ...
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### Screw modifier with mutiple curves (how to get good result)

The screw modifier is good for creating a solid mesh from a single curve profile, but it does not seem to provide any options for handling multiple curve profiles. This is the result of using a screw ...
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### Quaternion does not interpolate by the shortest route

I am rotating my camera. I have two rotations, both quaternions. The big white cube (which I added as refernece) can be seen in both frames, as proof that this rotation is not significant. from: {0....
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### Hair children don't seem to respond to changes?

I'm trying to style hair for a character, mainly following this tutorial, but encountered a weird issue. Not only children hair looks all scattered instead of being in a clean line, but it also looks ...
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### Is there a way to make a node property value the default?

I'm making a Minecraft animation and the only way the render comes out with clean pixelated textures and not blurry textures is if I set the image interpolation in the shader node editor to Closest. ...
1 vote
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### How do I change the interpolation of multiple keyframes in the graph editor (f-curve)?

When I select multiple keyframes in the f-curve view (graph editor) and change the interpolation to "constant", it only changes one keyframe, so how do I change it for multiple keyframes? Thank you
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### Eevee Linear / Cubic Texture Interpolation Complex Node Issue / Bug

A friend has been working on a project, and they have run into issues with using Linear Interpolation & Cubic Interpolation with their complex node tree. This node tree will be working with low ...
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