angle

I've got a longitude and latitude and want to convert this to a quaternion and wondering how I can do this? I want to use this, because I've got an app which projects the earth on a sphere and I want to rotate from one location to another one. Best! There's a way to go about this without using matrices or vectors, similar to this numpy implementation . We can think of longitude/latitude as two quaternion rotations composed together. Let's work with a Z-up right-handed coordinate system. Let's call longitude φ and latitude θ, and the point represented by the two as (φ, θ). For visualization,

So I'm very new to quaternions, but I understand the basics of how to manipulate stuff with them. What I'm currently trying to do is compare a known quaternion to two absolute points in space. I'm hoping what I can do is simply convert the points into a second quaternion, giving me an easy way to compare the two. What I've done so far is to turn the two points into a unit vector. From there I was hoping I could directly plug in the i j k into the imaginary portion of the quaternion with a scalar of zero. From there I could multiply one quaternion by the other's conjugate, resulting in a third

Is quaternion rotation just a vector with X,Y,Z which the object will rotate towards, and a roll which turns the object on its axis? Is it that simple? Meaning if you have X=0, Z=0 and Y=1 the object will face upwards? And if you have Y=0, Z=0 and X=1 the object will face to the right? (assuming X right, Y up and Z depth) A quaternion has 4 components, which can be related to an angle θ and an axis vector n . The rotation will make the object rotate about the axis n by an angle θ. For example, if we have an cube like ______ |\ 6 \ | \_____\ z |5 | | : y ^ \ | 4 | \| \|____| +--> x Then a

I need help with one tricky thing that I've tried to solve for a couple of days now. It feels like it should be relatively easy and that I am simply missing something somewhere. I have an array defining each wall point (black dots) and I want to create a new inside point (green dots) for each wall point. The distance between each wall point and inside point should be 600. I made a picture to show what I mean: I'm writing this in javascript with aid of WebGL (ThreeJS). I'm going to propose a solution similar to David's, but using vertices rather than line segments. My solution also requires a

I have application created with QT5 and Visual Studio 2013 . I also use QT WebEngine in my application. My application works fine in windows 7 (32 bit) . For some reason i need to run it in windows xp sp3 (32 bit). When i run it, I get the following error: The procedure entry point strnlen could not be located in the dynamic link library msvcrt.dll I press OK several time and it goes away and my QMainWindow will pop out, But its totally BLACK and i see the following errors in debugger. class QWindowsEGLStaticContext *__cdecl QWindowsEGLStaticContext::create(class QFlags<enum

Can anybody suggest how to calculate angle between three points (lat long coordinates) A : (12.92473, 77.6183) B : (12.92512, 77.61923) C : (12.92541, 77.61985) I see two main ways to solve your problem, assuming you want angle ABC (B is the vertex of the angle). Since your three points are close to each other (less than 0.0007° latitude and 0.002° longitude apart), we can approximate the earth as a plane and use two-dimensional vector calculations. A degree of longitude and of latitude are not the same distance when we are away from the equator, but we can adjust for that. Another solution is

I am currently trying to use OpenGL (With SDL) to draw a cube to the location where I left click in the screen and then get it to point at the position in the screen where I right click. I can successfully draw a cube at my desired location using gluUnproject - Meaning I already know the coordinates of which my cube is situated. However I do not know how to calculate all of the angles required to make my cube point at the new location. Of course I am still using gluUnproject to find the coordinates of my right click, but I only know how to rotate around the Z axis from using 2D graphics. For