Mathematical constructions, number systems. In 3D-graphics quaternions are used alongside vectors and matrices. One of the benefits of quaternions is that they overcome some rotational problems (known as gimbal locks) that are inherent to vectors and matrices.

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Get quaternion between two objects on sphere

In a planetary gravity environment objects are represented in the following way: struct object { struct quaternion quat; // quaternion to represent the rotation between the object and the center ...
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How to get quaternion from two orthogonal 3D vectors?

I have a unit vector representing the direction I want to "look" and a unit vector for up. They are orthogonal. How can I get the quaternion that represents that orientation from those two vectors?
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57 views

Camera Movement Smoothing

I am trying to smooth a camera I create in my game, but I can't seem to find a way to actually do this correctly. What I have : //Calculate the "current" Forward vector var cameraForward = ...
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654 views

How can I create a WebGL camera based on quaternions?

I am trying to create a WebGL camera based on quaternions. I looked at many tutorials, and none is as simple as it could be or it was not working. How can I create such a camera?
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Quaternion - rotating rigidBody to particular angle over time

Using Bullet Physics. There's a rigid body that is rotated. For some delta-time I need to rotate that body to have rotation of (0, y, 0) - keep the old y value rotation but reset x and z. The ...
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311 views

Quaternion to direction vector - flipping

I've kinda solved this myself by adapting the Camera::setDirection code from OGRE to work for my need: Now I have the following code: Vector3 boneDir = getBoneWorldOrientation(mEntity, mHips) * ...
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How to set object's / node's absolute rotation correctly?

Usually when I want to rotate an object/node in my Ogre scene I call the node's rotate() method. That rotates the node locally relative to it's current rotation. So for example, when I start with 0 ...
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31 views

Trackball Rotation using Quaternions

I am trying to figure out rotations using quaternions. I am using a trackball that tracks the mouse when I click. So when I click on the right and drag to the left, the cube rotates around the y ...
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63 views

XNA C# - Get original rotation from parent bone transform

I have a 3DS Max made model, exported into FBX and imported into XNA project. The parts I am working with have NOT been rotated in Max (specifically, collision mesh is made of Axiz-Aligned boxes). ...
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Camera Rolling when Implementing Pitch and Yaw

I am implementing a camera in opengl for an android game and am having problems getting the pitch/yaw/roll of the camera correct. I have read many tutorials on quaternions and have implemented a basic ...
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3d Rotation problem

I was given an interesting (but tough) problem to solve: In a game, you want to change the heading of an enemy by +30°. Construct a Rotation Matrix, Euler Angles and a Quaternion that would do this. ...
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111 views

JBullet quaternion to Euler angle conversion causes strange flipping behavior

I am making a game using JBullet (a Java port of C++'s Bullet library) for the physics and LWJGL for the graphics. However, JBullet measures angles in quaternions and LWJGL uses Euler or ...
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rotating sprite with quaternion in scenegraph

I have been trying to set up a scenegraph in XNA, which I then use to draw sprites in the correct places. It uses matrix transformations to accomplish this. So far, I got position and scale working ...
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111 views

GLM Rotating Combining Multiple Quaternions?

I have a camera which I want to control with my mouse. I want the mouse to control the pitch and yaw of the camera but not the roll. To avoid loss of significance, I am storing the quaternions for ...
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54 views

How to move objects flat on different planes in 3d?

I need to move objects in circular/square/sinusoidal patterns in a flat manner on a collection of different and rotating planes in 3d space. I have the perpendicular of the planes. One method is to ...