# Questions tagged [animation]

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### Double quaternion skinning artifacts

This is technically about PGA motors, but dual quaternions are a subalgebra of PGA so for all given purposes it's the same idea. I have an animation in gltf, specified as inverse bind pose matrices, ...
• 1,726
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### Pitfalls of animating with quaternions

When working with animating a rig, quaternions are often used for rotations. However sometimes we need to clear rotation along given local axis of a joint. With quaternions it's not as simple as just ...
• 516
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### Triangle-based and vertex-based skinning models?

I'm reading the Loper et al. 2015 paper on the Skinned Multi-Person Linear Model and I came across this: What we would like is a vertex-based model that has the expressive power of the triangle ...
• 21
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### Interpolating normals during animation

I'm doing linear tweening of a cyllinder to a cone of equal radius and height in OpenGL. I know parametric equations of both of them, so I derived vertex normals accordingly. Now, I know, that proper ...
• 153
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### How are fluid simulations handled in Computer Graphics?

How are fluid simulations handled in Computer Graphics? For a novice, there are hardly any novice friendly tutorials explaining how particles or fluids can be simulated. Things like smoke, crown ...
• 2,511
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### smooth zoom animation formulas (and rounding numbers)

I need to generate an easy animation video in Python (I use PIL to create every frame, then combine them using avconv). The animation is just an image being zoomed ...
389 views

### Coordinate system transformation in motion capture files

I am trying to align two motion capture files from different sources. The motion capture file consist of a skeleton specified as a hierarchy of joints. Each joint i.e. "shoulder" has three pieces of ...
• 121
1 vote
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### Animation issue using BVH data in OpenGL

I’m currently working on a project involving animation programming using OpenGL and BVH (Biovision Hierarchy) data for animation, and I am trying to get my head around it. I’ve run into some issues ...
• 11
1 vote
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### How to plot an ADC value from the Raspberry PI Pico using pythons matplotlib

Being new to Python and this community, I am trying to plot the pulse return from a transducer. The pulse return is 400 uSecs in duration and occurs every 100 milliseconds. So far I can plot the ...
• 11
1 vote
39 views

### Understanding rig joint angle definitions in Blender

I am trying to transfer some mocap data from one skeleton to another one. However, the skeletons have different rest poses (one has T-pose, and the other some other one), so I am trying to convert the ...
• 111
1 vote
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### General interpolation practices

Say my animation scenario contains one mesh interpolating into another (possibly approximating over other meshes), using Bezier curves. I know that for smooth surfaces, where normals can be ...
• 153
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### Starting from a basic glTF (such as a static sphere or plane) exported from Blender how can I add an animation manipulating its JSON?

I'm working on a glTF, precisely I'm trying to animate a "static" mesh exported from Blender directly acting on its JSON. In doing so, I'm following the logic used in this tutorial , where a ...
25 views

### Animated bitmaps with 2 colours only

I want to create an animated GIF, but instead of 8-bit 256 colours, my data is comprised of binary bitmaps of black/white pixels. Can GIF accommodate this, or are pixels in GIF always 8-bit indices? I ...
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### How is Unreal's 2D Blendspace implemented?

I'm currently trying to implement animation blending. Or more specifically, parametric animation. Unreal Engine has this in the form of blendspaces. After some experimentation, I've noticed that they ...
86 views

### Apply a pose to a 3D model/mesh

Assuming that I have pose information for a human, is there any ways/tools to apply that pose to a 3D model? Basically, given continous pose information say from a dancing person, I like to animate a ...
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### How to do keyframe interpolation on matlab?

I want to do keyframe interpolation in matlab. If I understand correctly, it uses splines to approximate the the motion of specific pixel points within the frames(through transforms). Correct me if I'...