rotation

问题 I've been banging my head against the wall with this for several hours and I can't seem to figure out what I'm doing wrong. I'm trying to generate a rotation matrix which will align a vector with a particular axis (I'll ultimately be transforming more data, so having the rotation matrix is important). I feel like my method is right, and if I test it on a variety of vectors, it works pretty well , but the transformed vectors are always a little off . Here's a full code sample I'm using to test

问题 In Android I can get the device yaw, roll and pitch using a GAME_ROTATION_VECTOR sensor. I need to do the same thing in Flutter, but I haven't been able to find anything but the sensors package, which only gives access to accelerometer & gyroscope sensors. What can I do? Do I need to calculate the orientation myself from the accelerometer and gyro? 回答1: Don't know if this is still relevant, as the question wasn't closed, but for those seeking the answer... there is now a Flutter Sensors

问题 I am trying to generate a view matrix that would behave as an FPS camera, but instead I am getting roll. Sharing my python code in case someone can spot what the problem is: import numpy as np class Camera(): def __init__(self): self.sens = np.array([0.002, 0.002]) # mouse sensitivity (x, y) self.angpos = np.array([0.0, 0.0]) # (pitch, yaw) def mouse_move(self, pos, rel): self.angpos = rel[::-1]*self.sens # mouse relative motion (delta-x, delta-y) ya = self.angpos[1] yrot = np.array([ [ np

问题 Hopefully this is an easy one because I've been trying all sorts of different ways to get rid of this. I am making an android app which incorporates a clock animation. I've got everything working really well except one very annoying thing. I have a second hand on the clock and I'm using the following code to rotate it around a the second hand center point. As you'll probably notice I'm trying to make this look like an analogue second hand so it sweeps instead of just ticking. public float

问题 From the picture, I use rotate3d() to the red rectangle so half of it is in front of black rectangle and the other is behind. I want black rectangle to be front of red rectangle so I have to use translateZ() so it become The problem is that I want black rectangle to be front without scaling it. I want black rectangle to still be the same size. Is there any trick? I tried z-index but it didn't work. I guess it because I use rotate3d(). Thanks in advance. 回答1: I do not have access to Safari at

问题 I'm making a program that rotates six-point stars with two triangles overlapping when I click the mouse button. Click right mouse button: star spins Click middle mouse button: star's color changes(white → blue) I've applied the codes to rotate a rectangle, but when I click right mouse button, it doesn't rotate and makes a jump around. And when the middle mouse button is clicked, the color changing is successful but it is initialized by rotating the star. I would like to rotate the star with

问题 I want to rotate an image using css3 rotate and javascript setinterval. The image should rotate on mouseover. Anyone know how to ? 回答1: You don't even need JavaScript to do it; just put a transition for transform on the element, and apply the rotation on hover. For example: div { background-color: red; height: 100px; -webkit-transition: -webkit-transform 0.5s ease-in-out; -moz-transition: -moz-transform 0.5s ease-in-out; -o-transition: -o-transform 0.5s ease-in-out; transition: transform 0.5s

问题 I'm quite new to JavaScript and I have trouble working with etInterval() . I'm creating an analogue clock as an exercise. I have a function setTime() that gets and displays the time by rotating the arrows accordingly. I want to execute this function again and again. Here is my code : $(document).ready(function(){ function setTime(){ var d = new Date(); var hour = d.getHours(); var minute = d.getMinutes(); var hourRotation = hour * 30 + (minute / 2); var minuteRotation = minute * 6; $("#small"

问题 I've made the following code: #include <math.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glut.h> #define WIDTH 400 #define HEIGTH 400 #define ORIGIN_X 50 #define ORIGIN_Y 50 #define move(x,y) glTranslatef(x, y, 0.0f); #define enlarge(y) glScalef(1, y, 1); #define rotateX(angle) glRotatef(angle, 1,0,0); #define rotateY(angle) glRotatef(angle, 0,1,0); #define rotateZ(angle) glRotatef(angle, 0,0,1); // Variables que definen la rotación del brazo entero (de hombro a mano) static

问题 By default, the modelInstance is rotated by its centre (0,0,0), I want it to rotate by (0,2,2). I know that in other game engines, there is method like model.setRotationPivot(float) , is there any similar method in libgdx? // how to set rotation pivot? modelInstance.transform.set(position, rotation, scale); Thanks! 回答1: Late answer: As I know there is no method to set the pivot. I use a workaround for this. Vector3 vec3 = new Vector3(0, 2, 2); vec3.rotate(Vector3.Y, rotation); modelInstance