rotational-matrices Questions
4
Solved
I'd like to randomly rotate an image tensor (B, C, H, W) around it's center (2d rotation I think?). I would like to avoid using NumPy and Kornia, so that I basically only need to import from the to...
Plovdiv asked 4/10, 2020 at 17:29
5
Solved
I have a sensor manager that returns a rotationMatrix based on the devices Magnetometer and Accelerometer. I have been trying to also calculate the yaw pitch and roll of the user's device but am fi...
Ambience asked 16/7, 2012 at 23:29
6
Solved
I'm learning about unit quaternions and how to use them to represent and compose rotations. Wikipedia says they are more numerically stable than matrix representations, but doesn't give a reference...
Fjeld asked 18/4, 2014 at 1:43
7
After multiplying a lot of rotation matrices, the end result might not be a valid rotation matrix any more, due to rounding issues (de-orthogonalized)
One way to re-orthogonalize is to follow thes...
Nogas asked 15/4, 2014 at 10:15
5
Solved
I have two separate vectors of 3D data points that represent curves and I'm plotting these as scatter data in a 3D plot with matplotlib.
Both the vectors start at the origin, and both are of unit ...
Zambrano asked 17/7, 2017 at 11:22
9
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I'm a physicist, and have been learning some programming, and have come across a lot of people using quaternions for rotations instead of writing things in matrix/vector form.
In physics, there a...
Cheung asked 18/1, 2012 at 23:30
3
Solved
I am making a game and I need the projectile to face which direction its going. I know which direction its going and I need to make a transformation matrix that would allow me to align the projecti...
Intercept asked 19/12, 2015 at 2:30
11
Solved
This is a question from Cracking the Coding Interview. The solution says that the program rotates the exterior edges, then the interior edges. However, I'm having trouble following the logic of bot...
Hertel asked 17/9, 2014 at 4:47
1
Solved
I want to train some models to work with grayscale images, which e.g. is useful for microscope applications (Source). Therefore I want to train my model on graysale imagenet, using the pytorch gray...
Intrusion asked 13/1, 2021 at 9:27
0
Community,
I am trying to align a point cloud with the detected floor using Open3D. So far I implemented the following steps (partly of this answer):
Detecting the floor using Open3D's plane segme...
Psychosomatics asked 26/6, 2020 at 14:23
4
Solved
I'd like to show arrows indicating the world coordinate directions (x, y, z) in the bottom right hand corner of the camera like is done in Maya, so that when rotating the camera around an object, o...
Involucel asked 26/4, 2013 at 0:6
0
From this answer; https://mcmap.net/q/791063/-3d-point-rotation-algorithm I have made some code that should rotate a point around an origin point. The origin is at 0,0,0.
Instead of my rotations b...
Quantic asked 21/10, 2019 at 11:24
1
Solved
I know we can make the object have a new parent to act as the pivot, or we could adjust the geometry position within the mesh.
But how can we achieve this mathematically without reparenting the ob...
Neogaea asked 12/3, 2019 at 7:27
4
Solved
I know the transformation matrices for rotation, scaling, translation etc. I also know the matrix for shear transformation. Now, I need to have the shear matrix--
[1 Sx 0]
[0 1 0]
[0 0 1]
in the...
Rata asked 21/8, 2013 at 15:47
1
I'm currently stuck on achieving an equirectangular rotation on a 360° image with OpenCV because of my mathematical understanding (nearly zero) of projections and rotations matrixes.
The result o...
Chrysostom asked 28/11, 2017 at 16:46
2
Solved
I need to extract the roll pitch yaw angles from a rotation matrix and I want to be sure that what I do is correct.
Eigen::Matrix< simFloat, 3, 1> rpy = orientation.toRotationMatrix().eule...
Coen asked 16/12, 2014 at 15:38
2
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I've seen several similar questions, and have some ideas of what I might try, but I don't remember seeing anything about spread.
So: I am working on a measurement system, ultimately computer visi...
Teasley asked 10/7, 2015 at 18:56
3
Solved
I have a rotation matrix, and am using .dot to apply it to new values.
How can I apply it to each row in a numpy array?
Numpy array looks like:
[-0.239746 -0.290771 -0.867432]
[-0.259033 -0.320...
Easternmost asked 14/7, 2016 at 10:48
1
Solved
I'm having a bit of trouble understanding how axis-angle rotation vectors are used when rotating a vector in 3D space. Why are these used and how do these relate to rotation matrices?
I also found...
Ladylike asked 9/9, 2015 at 17:22
2
Solved
Suppose I have two matrices of PCA loadings loa.orig, and loa.rot, and I know that loa.rot is a rotation (by-hand or otherwise) of loa.orig.
(loa.orig might also have been already orthogonally rot...
Catsup asked 18/7, 2015 at 12:35
1
I have implemented listener for both Rotation Vector and Orientation Vector though i know it's depreciated i wanted to test both.
I know Rotation Vector is a fusion sensor & recommended but ac...
Nert asked 11/7, 2013 at 21:29
5
Solved
I have a problem where I have a bunch of lengths and want to start at the origin (pretend I'm facing to the positive end of the y axis), I make a right and move positively along the x axis for the ...
Montenegro asked 3/12, 2013 at 21:13
1
Solved
I've been trying to work out how to solve the following problem using python:
We have points a, b, c, d which form a rigid body
Some unknown 3D translation and rotation is applied to the rigid bo...
Multivalent asked 18/4, 2013 at 12:40
1
Solved
I'm trying to rotate a matrix counterclockwise by 90 degrees in Java. I found answers on how to do this with a 2D matrix, but my matrix is 3D.
Here's how I found out on how to do a 2D rotation:
s...
Vergne asked 16/1, 2013 at 20:34
3
Solved
There are Google results and stackoverflow posts that appear to answer this question, but the simple fact is I can't understand them. No matter how much I read, I can't get my head around quaternio...
Dustproof asked 11/12, 2012 at 15:41
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