The circular movement of an object around a specific axis.

learn more… | top users | synonyms

1
vote
1answer
65 views

PID controller error value for heading correction

I'm using a PID controller in my AI to steer my NPCs to a desired heading (by adding torque). I've adapted the code from here: ...
1
vote
4answers
259 views

How to set speed of circular motion

Edit 2 - clarification Just to clarify, the issue I have at the moment is how I specify a time (in seconds) for a complete revolution to occur. My delta is fixed and is 1/ticks per second (1/60). ...
4
votes
5answers
433 views

How to rotate an object around world aligned axes?

I have a Vector3 which has an euler angle for each axis. Usually, when I want to create a rotation matrix I will use functions such as D3DXMatrixRotationX passing the respective angle from my ...
0
votes
1answer
308 views

Rotation about a point in OpenGL ES 2 (Android)

I'm trying to implement rotation about a point (the origin) using quaternions. My camera is at (0, 0, 3). I'm applying all the operations to the view matrix. Basically my rotation is at the moment not ...
0
votes
1answer
83 views

up vector for quaternion

First, I know there's a question exactly like mine, and some ohter really close, but my implementation of the solutions didn't work at all. Ok, now to the question. I created some forms of camera ...
0
votes
0answers
36 views

Sprite rotation algorithm [duplicate]

I'm making a game where you have to plot a function to hit certain objectives. I already made the plotting function and the animation to display a tiny missile that travels above the function. My ...
0
votes
1answer
129 views

(XNA) 3D Model Rotation Angles

I'm currently in the process of making a 3d "semi" top down game, the camera comes in at a very high angle near 90 to show off the 3d models. I have a main character which can move in 4 axis (up, ...
1
vote
1answer
152 views

Making player movement direction follow players facing direction

if (controller.isGrounded) { moveDirection = new Vector3 (Input.GetAxis ("Horizontal"), 0, Input.GetAxis ("Vertical")); moveDirection = ...
0
votes
0answers
55 views

Using Angles (or rotation) with Vectors for Car physics

I've been reading this blog that explains basic linear algebra for game developers and I understand the basics of vector mathematics. I'm using vectors to create a car that simulates the very basic ...
2
votes
0answers
417 views

Arcball 3D camera

I have checked multiple threads before posting, but i havent been able to figure this one out. Ok so i have been following this tutorial, but im not using glm, ive been implementing everything up ...
0
votes
1answer
97 views

Rotation and translation like in GTA 1 OpenGL

Okay, so I have a figure in XZ plain. I want to move it forward/backward and rotate at it's own Y axis, then move forward again in the rotation's direction, like the character in GTA 1. Code so far: ...
1
vote
1answer
153 views

Converting 3 axis vectors to a rotation matrix [closed]

I am trying to get a rotation matrix (in 3dsmax) from 3 vectors that form an axis (all 3 vectors are aligned by 90 degrees each other) Somewhere I read that I could build a rotation matrix just by ...
2
votes
2answers
338 views

Rotate to a set degree then reverse and repeat in Unity

I'm making my first project in Unity, a simple game where touching objects adds points to the player's score. I'd like the objects to have a pleasant back and forth swaying animation on the Z axis. ...
0
votes
0answers
17 views

How to Point sprite's direction towards Mouse or an Object [duplicate]

I need some help with rotating sprites towards the mouse. I'm currently using the library allegro 5.XX. The rotation of the sprite works but it's constantly inaccurate. It's always a few angles off ...
5
votes
2answers
427 views

Rotating object around moving object/player in 2D

I am trying to implement a camera which rotates around the world around the player. I have found many solutions online to the task of rotating an object about the origin, or about an arbitrary point. ...
0
votes
3answers
183 views

What are the semantics of glRotate and glTranslate's parameters?

I have been trying to play with OpenGL after watching some tutorials and I don't understand how the glTranslatef and glRotatef functions work. I believe a simple picture would help me. I understand ...
0
votes
0answers
51 views

3D Box Collision Data Import

I'm trying to implement a collision system using oriented bounding boxes, using a center for the box, it's extents as a 3D Vector and a rotation matrix, which is all stuff I picked up online and seem ...
1
vote
1answer
135 views

Sprite rotation

I'm using OpenGL and people suggest using glRotate for sprite rotation, but I find that strange. My problem with it is that it rotates the whole matrix, which sort of screws up all my collision ...
7
votes
3answers
338 views

Slerping rotation mirrors

I rotate my game character to watch at the target using the following code: transform.rotation = Quaternion.Slerp(startQuaternion, lookQuaternion, turningNormalizer*turningSpeed/10f) ...
0
votes
1answer
218 views

Rotating object along bezier curve: not rotating enough?

I tried to follow the instructions from the threads on the forum (Cocos2d rotating sprite while moving with CCBezierBy) with Unity, in order to rotate my object as it moves along a bezier curve. But ...
0
votes
0answers
195 views

JavaScript 3D space ship rotation

I am working with a fairly low-level JavaScript 3D API (not Three.js) which uses euler angles for rotation. In most cases, euler angles work quite well for doing things like aligning buildings, ...
4
votes
1answer
183 views

Keep cube spinning after fling

So I've been trying to get started with game development for Android using Unity3D. For my first project I've made a simple cube that you can spin using touch. For that I have the following code: ...
0
votes
0answers
31 views

How can I detect the order/type of Euler Angles system used in a game/movie editor

How can I detect the order and type of Euler Angles system used in a 3d game engine/movie editor? I have no document, I can do experiments. I detect Quaternions by Permute a quaternions to get 24 ...
0
votes
0answers
670 views

Drawing and rotating bitmaps (with transparency) efficiently in Android

I just started making a game for Android and I'm already having some issues regarding performance. You can imagine the game as being some kind of Tower Defense game with a top-view, and the enemies ...
0
votes
1answer
58 views

How to rotate two scaled objects

I have two objects. The head and tail of a future "grapple". The head and tail always point in the same direction. However, when I tried using scaled rectangles (that were bigger/smaller than the ...
0
votes
1answer
170 views

How to draw a rotatable and zoomable sphere?

My game is a sort of business simulation game of Earth, and I want the main interface to be just like a google earth view. Is there a way to do this with built in OpenGL features or do I have to ...
1
vote
1answer
307 views

Correct rotation with Quaternion

I have some problems with a rotating marble. I've tried it with Matrix.CreateFromYawPitchRoll and Matrix.CreateRotation but there were some problems, I think it's due to the Gimbal lock effect. So, ...
0
votes
0answers
175 views

OpenTK (OpenGL) Rotation around fixed axes?

How would I go about rotating things in 3-dimensional space along fixed axes? As OpenTK only seems to have rotation that modifies the other rotation, as in X affects Y & Z Y affects Z Z affects ...
3
votes
2answers
197 views

Using quaternions, how do I determine if an object is upside down from an original rotation?

Imagine this scenario: An object is laying flat on a horizontal surface, from this an original rotation is determined. Then the object is moved, and at some point flipped upside down and put back down ...
0
votes
0answers
52 views

camera panning problems with “modelviewer” camera

I have a camera that rotates around a center point using a rotation matrix and radius for the zoom from the object. I need to add right mouse button panning in. Here is the problem: when I change ...
0
votes
0answers
75 views

How do I ADD gravitation to a rotation matrix?

I have ported the Matlab script from https://instruct1.cit.cornell.edu/courses/bionb441/LSystem/ to POV-Ray and everything works fine (although I'm not quite sure why). To navigate a "turtle" through ...
2
votes
0answers
179 views

Use quaterions to move the camera direction according to mouse movement

I am trying to use quaterions to move the camera direction vector in the following way. This code is perfectly working glm::quat temp1 = glm::normalize( glm::quat((GLfloat)( ...
0
votes
2answers
293 views

Translate extrinsic rotations to intrinsic rotations ( Euler angles )

The problem I have is very frustrating: I am using the Jitter Physics library which gives Quaternion rotations, you can extract the extrinsic rotations but I need intrinsic rotations to rotate in ...
1
vote
1answer
521 views

Need to translate a Rotation Matrix to Rotation y, x, z OpenGL & Jitter for 3D Game

I am using the Jitter Physics engine which gives a rotation matrix: M11 M12 M13 M21 M22 M23 M21 M32 M33 And I need it so OpenGL can use it for rotation GL.Rotate(xr, 1, 0, 0) GL.Rotate(yr, 0, 1, ...
1
vote
1answer
419 views

Rotate image around a specified origin

I'm trying to rotate my Turret.png (small Gunhead with a laser in front) towards the mouses location on the screen. I tried just using my method for rotating projectiles towards the next step on their ...
0
votes
3answers
2k views

Unity3D Orbit around orbiting object (transform.RotateAround)

The best way to explain this is I'm attempting to make a small model solar system (not to scale or anything complicated, just simple rotation as a learning exercise). There's a sun, a planet, and that ...
1
vote
2answers
155 views

“Align” a rotation to a direction

Good day all. I have a 3d object with a random rotation. I can express that object's rotation both through a quaternion or through an euler rotation. Then I have a vector3 normal that I get from a ...
-1
votes
1answer
220 views

Java moving image to where it is facing

I am trying to make an Asteroids type game. I searched and tried everything to move an image along its angle (as radiant). Using my knowledge of trigonometry I made the following calculation: x += ...
0
votes
1answer
4k views

Rotate an object smoothly on the Y axis in Unity

I am attempting a simple script to swing a door open in Unity. This requires a smooth rotation of 90 degrees around the Y axis. I have seen that one way to do this is using Unity's Quanternion ...
0
votes
0answers
53 views

Tetris-like wall-kicking not working [duplicate]

So I'm making a falling-block puzzle game. It's not a Tetris clone, but the block clusters move in a similar fashion. I want to make it so that if you rotate against a wall, or against another ...
0
votes
1answer
122 views

Orbiting a camera around the Y axis whilst remaining up

I've been having difficulty with a problem which I thought was going to be a simple solution. I have a camera facing downwards on a character. The can camera be lowered and when it's lowered it ...
0
votes
0answers
100 views

How do I find the rotation point given a touch anchor, new position and new rotation?

I've got an Cocos2d layer which anchorPoint, position and rotation (according to http://www.qcmat.com/understanding-anchorpoint-in-cocos2d/) vary when the pinch zoom gestures. Everything works fine. ...
0
votes
2answers
163 views

get the new vertices after rotating in JOGL

I had rotate an object with openGL (JOGL). Is there a simply way how I can get the new vertices?
1
vote
1answer
119 views

Getting mousemovement despite mouselock - unity

I have lockcursor so the cursor doesn't leave the screen, but now i have to rotate an object based on mouse movement (think garrys mod item rotation) but the mouse cursor is obviusly locked to the ...
3
votes
1answer
205 views

Jittery Movement, Uncontrollably Rotating + Front of Sprite?

So I've been looking around to try and figure out how I make my sprite face my mouse. So far the sprite moves to where my mouse is by some vector math. Now I'd like it to rotate and face the mouse as ...
0
votes
0answers
87 views

Follow sinus with absolute value

I would like to make an arm follow the sinus of the ball. When I add an absolute value to the ball (on the y axis) to get a more realistic bounce, the ball is going 2 times faster. How could I ask ...
1
vote
0answers
74 views

Rotate view matrix based on touch coordinates

I'm working on an Android game where I need to rotate the camera around the origin based on the user dragging their finger. My view matrix has initial position of sitting on the negative z and facing ...
9
votes
2answers
395 views

How do I simulate a swinging pendulum?

I want to simulate a rope with a weight attached, swinging back and forth like a pendulum. Any actual physics is overkill; it's just endlessly repeating the same motion. JQuery has a the "swing" ease ...
1
vote
2answers
188 views

Rotations and Origins

I was hoping someone could explain to me, or help me understand, the math behind rotations and origins. I'm working on a little top down space sim and I can rotate my ship just how I want it. Now, ...
1
vote
0answers
103 views

Finetuning movement based on gradual rotation towards a target [duplicate]

I have an object which moves towards a target destination by gradually adjusting its facing while moving forwards. If the target destination is in a "blind spot", then the object is incapable of ...