How to interpolate values in non-rectangular coordinates using Python? Question: I need to make compensation of values in my optical system using Python. I’ve measured the dependency of my compensation params in the corners of my table and I want to interpolate such value there linearly, but a map is not a rectangle. Example: # …
Understanding OpenCV homography at a minimum of points Question: I am quite intrigued by the idea of a homography and try to get it to work at a minimal example with python and OpenCV. Yet, my tests do not pass and I am not quite sure why. I pass in a set of corresponding points …
Transform from data to figure coordinates Question: Similar to this post, I would like to transform my data coordinates to figure coordinates. Unfortunately, the transformation tutorial doesn’t seem to talk about it. So I came up with something analogous to the answer by wilywampa, but for some reason, there is something wrong and I can’t …
Why does this python code gives the wrong answer when converting between cartesian and spherical coordinates? Question: So I set up two functions in python3.4, Cartesian2Spherical and Spherical2Cartesian, in order to help me convert a point between cartesian ans spherical coordinate systems as part of an application that required lots of such coordinate transformations. Here …
PyOpenGL transforming view coordinates into object coordinates for ArcBall navigation Question: I am following this tutorial for arcball navigation in 3d: https://en.wikibooks.org/wiki/OpenGL_Programming/Modern_OpenGL_Tutorial_Arcball I managed to perform all the steps and the navigation works but I cant seem to comprehend last step in tutorial: An extra trick is converting the rotation axis from camera coordinates to …
How to convert Earth Centered Inertial (ECI) coordinates to Earth Centered Earth Fixed (ECEF) AstroPy? Other? Question: I have position (x,y,z) and velocity (Vx,Vy,Vz) vectors in Earth Centered Inertial Coordinates (ECI) for a satellite orbit, and ultimately want to end up with geodetic coordinates (Latitude, Longitude, & Altitude). According to this other Stack Overflow question …
Determining a homogeneous affine transformation matrix from six points in 3D using Python Question: I am given the locations of three points: p1 = [1.0, 1.0, 1.0] p2 = [1.0, 2.0, 1.0] p3 = [1.0, 1.0, 2.0] and their transformed counterparts: p1_prime = [2.414213562373094, 5.732050807568877, 0.7320508075688767] p2_prime = [2.7677669529663684, 6.665063509461097, 0.6650635094610956] p3_prime = [2.7677669529663675, 5.665063509461096, …
