All Questions
539
questions
0
votes
0
answers
11
views
SemanticKITTI rotation troubles
The pose data provided with the SemanticKITTI (https://semantic-kitti.org/) LIDAR dataset is formatted unusually. For instance, they use a 'yzx' coordinate system instead of the standard 'xyz'. My ...
- 1
1
vote
1
answer
91
views
3D CSS3 transforms handling with DOMMatrix issue
Context
I'm trying to handle geometric operations applied to HTML elements by CSS3 3d transforms through DOMMatrix API to retrieve any coord i want in any coord system i want.
The Issue
Everything ...
- 601
1
vote
1
answer
413
views
What do the "facial transformation matrix" and "canonical face model" when extracting 3D face poses from MediaPipe?
I'm currently playing around with the MediaPipe face detection tool from Google. I am using it to extract 3D poses from an image containing a face. I'm a little confused about the returned outputs ...
- 639
0
votes
0
answers
37
views
Fine tuning matrix slerp
I'm looking for help on getting a proper matrix slerp going. I'm hoping to get it to work with arbitrary matrices, since I'm using this as part of a skeletal system that is not always rotating around ...
- 672
0
votes
1
answer
170
views
Calculating a transformation matrix from corresponding points (ThreeJS)
I have two sets of three corresponding (x,y) points, a and b:
// (example values, not actual)
const a = [[1, 1], [2, 2], [3, 3]]
const b = [/* etc, same format as `a` */]
I'm using ThreeJS and trying ...
- 1
0
votes
0
answers
12
views
Amount of possible Matrix multiplications per frame?
I want to know how many matrices a top tier graphics card can multiply. I am talking about 4x4 projection/view matrices, no lighting whatsoever. Also, I do not want an exact number but more like a ...
- 65
0
votes
1
answer
103
views
Plotting 3D Surface Graph
I'm facing an issue while trying to generate a 3D surface plot in MATLAB using the surf function. The error message I'm encountering is "Z must be a matrix, not a scalar or vector."
The ...
- 1
0
votes
0
answers
22
views
I want to move a character in a matrix
I want the object to move in the direction of the rotation axis. And we want the rotation axis to rotate while its position is fixed.
Taking a game character as an example, the character can rotate in ...
- 41
0
votes
0
answers
137
views
Rotating a cube in 2D space
I'm building my own "Graphics Library" which manipulates PPM files under the hood. The library can create videos, too, by utilizing ffmpeg. My library mainly does 2D videos, but I wanted to ...
- 19
0
votes
1
answer
48
views
X-rotation looks weird
I decided to learn a bit about matrices and 3D cameras and made some educational project for myself, to understand how it works. Swift and SwiftUI because I'm a bit familiar with. But question is more ...
- 805
0
votes
0
answers
14
views
can i get the plane describing the edge of my view frustum
tldr: I have a view frustum ive made by performing several cross products between different matrices, now im struggling to clip objects since i cant find a way to describe the planes at the edge of my ...
- 42
0
votes
1
answer
178
views
3D object location to 2D image
I am using ROS to record data from CARLA Simulator. I want to render a bounding box on the RGB Front camera image that correspond to the other vehicle's location.
Here is an example frame from the bag ...
- 41
-1
votes
1
answer
388
views
Position of a vector in coordinate system (Processing/p5.js)
i am new to processing i had to perform a task and i wanted to know how can i go about it in processing.
Down below is the code and i want to find the coordinates of Pvector 'vectorInNewCoordSys' in ...
0
votes
1
answer
60
views
Numpy 3D Matrix Multiplication (Same Dimensions)
I am trying to multiply two 3D matrices with the same dimensions (MxNxD). I know in 2D matrix multiplication, I can just transpose one and do the matrix multiplication. Is there a similar approach for ...
- 11
2
votes
1
answer
528
views
Why are two elements of my inverse projection matrix always 0?
I'm writing a ray tracer for which I need to cast rays from the screen into the world. I'm using the inverse of the view-projection-viewport matrix to get back from screen pixel coordinates to world ...
- 49.6k