trigonometry

来源： https://stackoverflow.com/questions/64580873/why-are-my-bullets-travelling-at-a-90-degree-angle-from-the-mouse

来源： https://stackoverflow.com/questions/64580873/why-are-my-bullets-travelling-at-a-90-degree-angle-from-the-mouse

来源： https://stackoverflow.com/questions/48971804/how-to-compute-sincos-fast-on-a-x64-cpu

来源： https://stackoverflow.com/questions/64463152/how-to-convert-from-atan-to-atan2

来源： https://stackoverflow.com/questions/64463152/how-to-convert-from-atan-to-atan2

来源： https://stackoverflow.com/questions/63918873/approximating-cosine-on-0-pi-using-only-single-precision-floating-point

问题 It sounds easy for me until I tried The implementation uses lib igl but the problem is not there but in my lack of math knowledge :-\ Eigen::MatrixXd p; const int size = 128; p.resize(size * size, 3); int index = 0; for (int y = 0; y < size; y++) { double ypos = (double(y) / double(size - 1)) - 0.5; for (int x = 0; x < size; x++) { double xpos = (double(x) / double(size - 1)) - 0.5; const double sphericalTheta = xpos * (pi / 2.0); const double sphericalPhi = ypos * (pi / 2.0); const double mX

问题 It sounds easy for me until I tried The implementation uses lib igl but the problem is not there but in my lack of math knowledge :-\ Eigen::MatrixXd p; const int size = 128; p.resize(size * size, 3); int index = 0; for (int y = 0; y < size; y++) { double ypos = (double(y) / double(size - 1)) - 0.5; for (int x = 0; x < size; x++) { double xpos = (double(x) / double(size - 1)) - 0.5; const double sphericalTheta = xpos * (pi / 2.0); const double sphericalPhi = ypos * (pi / 2.0); const double mX

问题 It sounds easy for me until I tried The implementation uses lib igl but the problem is not there but in my lack of math knowledge :-\ Eigen::MatrixXd p; const int size = 128; p.resize(size * size, 3); int index = 0; for (int y = 0; y < size; y++) { double ypos = (double(y) / double(size - 1)) - 0.5; for (int x = 0; x < size; x++) { double xpos = (double(x) / double(size - 1)) - 0.5; const double sphericalTheta = xpos * (pi / 2.0); const double sphericalPhi = ypos * (pi / 2.0); const double mX

问题 I have a set of data points in 3D space which apparently all fall onto a specific plane. I use PCA to compute the plane parameters. The 3rd component of PCA gives me the normal vector of the plane (weakest component). What I want to do next is to transform all the points onto said plane and look at it in 2D. My idea was to do the following: Find a center point (average point) on the plane Substract it from all data points to arrange them around the origin Rotate the normal so that it becomes