Questions tagged [animation]
The animation tag has no usage guidance.
45
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22 views
Was there an Evans & Sutherland display system capable of rendering ordinary data as motion through a landscape? [migrated]
Around 1987, the investment bank I worked for had a high-end graphics device, possibly from Evans & Sutherland, which produced an "animated" display not unlike the view from the front ...
0
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1answer
30 views
Animated rainbow distortion wave effect
https://foundation.app/mg/20210227-3lau-makes-history-1790
The link above shows a video animation that has a rainbow wave distortion effect applied to it, that ripples across the video. how, and in ...
0
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2answers
46 views
What is the name of this moving color pixels effect, for animating a painting?
https://superrare.co/artwork-v2/spring-22267
The artwork in the link seems to be based on a painting of a woman, but effects have been added that assign a pixel to each block of the painting that ...
1
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0answers
22 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 ...
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0answers
28 views
What do you do when the root skeleton is not defined in a gltf file?
Cross posting from stack overflow:
Reading the source code of tinygltf I see this:
...
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1answer
23 views
Why are these 2 buffers joint while extracting glTF information?
I am using tinyGLTF to parse gltf files and then render them in my program.
I am currently during the third example in this page.
In particular I am trying to extract the 2 animation buffers:
My code:...
2
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1answer
91 views
What's the simplest, open, animation format?
I have an obj parser that handles triangle meshes specifically.
I want to extend it (and the rest of my system) to handle animations as well. However, I don't think I am ready to tackle the glTF ...
0
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1answer
62 views
Keep constant number of visible circles in 3D animation
I have created a 3D animation with a perspective projection of white circles moving randomly in a fake 3D space projected on a 2D computer screen (GIF 1).
Since I need to keep the same number of ...
3
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1answer
114 views
What is the point of having integer-based draw routines in software rasterizer?
I wonder why all the well known algorithms of drawing for example circles (bresenham, mid-point, etc) all use integer arithmetics? For example, here is a simple circle drawn with bresenham algorithm:
...
0
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1answer
95 views
Compute Speed of Spheres in 3D animation
I have created two animations:
One where a "camera" moves towards the spheres creating an optic flow (1st GIF).The code can be found here.
One where spheres move randomly in a 3D coordinates space (...
0
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0answers
37 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 ...
2
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0answers
112 views
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 ...
1
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1answer
307 views
Why do animated CG characters always feel fake?
Why do animated CG characters always feel fake?
Usually if a CG character is an animal (or humanoid creature), they tend too look kinda off. Their movement tends to look oddly smooth or lightweight, ...
1
vote
1answer
43 views
Consistent animation speed across systems
I recently noticed that in all games, no matter what system you play on or what specs you have, your character will always move at the same speed even if there is no frame rate limit. I was wondering ...
2
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1answer
60 views
Should animations be locked to FPS or Fixed time
I have been working on a 3D engine and I am now implementing animations, but I can't find out whether or not to use the FPS of the engine or a fixed time method for the transformation's speed. Could ...
3
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1answer
207 views
What algorithm is used in this animation from Tatami Galaxy?
Is there a name for this type of effect where many area sizes are increased/decreased in relation to each other? I'm looking for some type of algorithm, formula, logic, etc. for recreating this. Here ...
2
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1answer
73 views
What noises can be sliced?
A well-known property of Perlin noise (with FBM) is that if you take a slice of it, the result is still Perlin noise. So, by taking successive slices of 4D noise, you get smoothly shifting 3D noise, ...
0
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1answer
96 views
Which techniques do I need to animate a 3D model in my homemade engine
Suppose I am making my own C++ 3D engine; I can already load a 3D model using assimp, display it with phong lighting, and I now want to animate it.
I'd like features in my engine to, say, load a run ...
2
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1answer
776 views
glTF animation keyframe question
I have an animated cube with 5 keyframes and when I export it to glTF with blender, in the file I can only see 3 keyframes:
But when I viewed the gltf model with viewer all 5 keyframes worked well ...
0
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1answer
28 views
compression of gif animation
I have a parchment animation at singingdays.co.uk that is a rather large file of about 80mb which obviously is taking a long time to download. I have managed to compress it down to about 60mb using ...
0
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1answer
78 views
kinematics and dynamics of a sphere in a spring mass system?
I am attempting to code a simple spring mass system simulation in which a sphere pendulus hangs from a string (a spring) by the top and then another sphere (controlled by the user) can move and ...
2
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0answers
109 views
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 ...
2
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1answer
1k views
How can I use 3d animation to create a character that uses sign language?
I performed a quick search on programs that translate natural language to sign language (through a 3D animation character). Here are examples:
IBM SISI
ProDeaf (which is an android app)
My question ...
5
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2answers
476 views
Was Evans & Sutherland CT5 really created in 1981?
A few days ago I found a video on Twitter showing the Evans & Sutherland CT5 Flight Simulator system. It was labeled as 1981 footage and looked really amazing. The first time I saw similar 3D ...
2
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1answer
121 views
pseudoinverse Jacobian and adding more control in computer animation
I am studying inverse kinematics.
But I wonder the suggested equations.
(The following equations are taken from 'Computer Animation Algorithms and Techniques Third Edition Page, 181')
To better ...
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0answers
66 views
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 ...
2
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0answers
84 views
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 ...
1
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1answer
56 views
Is it possible to draw the intersection of two squares of known dimension using only x,y coordinates and without an if statement?
Say I have two squares, both 10x10, with some small, unknown overlap.
Is there a way to draw the intersection of these two squares using the width, height and x,y coordinates of each square, while ...
2
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0answers
101 views
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 ...
3
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1answer
89 views
Need help reasoning about video oscillation >60hz
I want to make a basic video oscillator for the web. What I want to do is basically illustrated in a tutorial for Lumen: essentially, I want to define an oscillator to turn on and off a color signal ...
5
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2answers
2k views
Pixel dispersion (dissolving) algorithms
This YouTube video of a flip-dot display (physical b/w pixels) shows the reverse of an effect that might be called dissolve or dispersion, i.e. a text emerges from noise by pixels moving in to form ...
2
votes
1answer
448 views
Inverse Kinematics with more than 2 segments
I'm building a 2D inverse kinematics system and can't figure out how to find all the joint positions. I have the math to make a typical IK set up with a single bend (e.g. arm, leg), but I get stuck ...
4
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1answer
593 views
Calculating Skeleton-Deformed Mesh Normals
I'm implementing mesh skinning in a project of mine. I can calculate vertex positions based on bone transformations, but I've run into a problem with calculating their normals.
From the resources I'...
2
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0answers
75 views
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 ...
4
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1answer
133 views
How does a rigged model work?
What black magic is behind this?
Starting from a pile of polygons, a skeleton, and an initial conformation, how is a new conformation turned into a new pile of polygons?
3
votes
2answers
561 views
Storing 3D animations for ray tracing
I've just finished writing a path tracer that takes OBJ files and renders it. This is convenient for still images, but my end goal was to export a sequence from a 3D application (Blender was what I ...
7
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2answers
8k views
How to achieve gimbal lock with Euler angles?
I was studying about Euler angles and I came across the problem gimbal lock which can occur by using Euler angles. In gimbal lock we lose one axis of rotation.
But how? And when does it happen? On ...
0
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0answers
233 views
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'...
2
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0answers
287 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 ...
5
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1answer
208 views
Questions about Preconditioning Conjugate Gradient method in Baraff & Witkin 98?
I encountered some problems when implementing the cloth simulation algorithm from Baraff & Witkin 98's Large Steps in Cloth Simulation.
Baraff & Witkin 98
Consider the cloth as a particle ...
3
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1answer
242 views
Spine. What is the name of the process?
https://www.youtube.com/watch?v=twUz99ek5do&list=WL&index=5
There is a process from 1:51, where the guy start making polygons around the bodyparts. I think this is this part is where (with ...
1
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1answer
72 views
How to design something like this? [closed]
I am very eager to know what technology might been used to implement this piece of wonder:
Any idea?
I think, it's ray tracing. What do you think?
1
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0answers
64 views
How is smooth animation accomplished? [closed]
How are objects moved smoothly from point A to point B given matrix transformations that describe next position?
3
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2answers
162 views
Software to compose separate models into an articulated model?
I've inherited a system which animates a humanoid avatar by loading various models and manually calculating transformations for each one. I'm in the process of porting part of this system to Three.js, ...
14
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1answer
210 views
How can I model distant rain?
Close up, rain can be modeled as transparent balls of water with appropriate motion blur. This seems impractical for large volumes, which would be necessary for scenes of rain in the distance.
At ...
