The circular movement of an object around a specific axis.

learn more… | top users | synonyms

1
vote
4answers
365 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). ...
1
vote
1answer
79 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
1answer
1k views

Is it possible to rotate an image on an HTML5 canvas, without rotating the whole canvas?

So I basically want to rotate single sprites on the canvas without rotating the whole canvas, is that someway possible. I also don't want to create a new canvas for each object I have. Also, it ...
0
votes
1answer
568 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 ...
1
vote
2answers
203 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, ...
0
votes
1answer
94 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 ...
4
votes
1answer
3k views

How do I rotate a sprite so that it is 'pointing' in the direction it is moving?

I have a sprite, e.g a missile, heading in a certain direction (using a velocity vector). How do I figure out its how much to rotate it so that it gets drawn 'pointing' in the direction it is ...
4
votes
2answers
4k views

How can I move a sprite in the direction it is facing?

I'm using Java/Slick 2D. I'm trying to use the mouse to rotate the sprite and the arrow keys to move the sprite. I can get the sprite to rotate no problem, but I cannot get it to move in the direction ...
0
votes
1answer
213 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
2answers
305 views

Sprite not rotating around its centre after Scaling at its centre

If I scale a sprite at its centre, then try to rotate it around its centre as well, the rotation does not occur around its centre. If you need to rotate, for example a scaled ball,the way its working ...
1
vote
1answer
222 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
63 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 ...
0
votes
1answer
109 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: ...
0
votes
1answer
179 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 ...
0
votes
0answers
18 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 ...
0
votes
3answers
214 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 ...
7
votes
3answers
359 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) ...
1
vote
1answer
650 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, ...
0
votes
0answers
212 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 ...
0
votes
2answers
403 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 ...
0
votes
0answers
53 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
157 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 ...
0
votes
1answer
252 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
213 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, ...
0
votes
0answers
37 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
846 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
62 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 ...
1
vote
1answer
384 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, ...
3
votes
2answers
253 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
78 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
213 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)( ...
8
votes
4answers
11k views

How can I orbit a camera about it's target point?

I'm drawing a scene where the camera freely moves about the universe. The camera class keeps track of the view (or look at) point, the position of the camera, and the up vector. These vectors/points ...
0
votes
3answers
3k 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
291 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 ...
2
votes
2answers
4k views

Rotate canvas along its center based on user touch - Android

I want to rotate the canvas circularly on its center axis based on user touch. i want to rotate based on center but its rotating based on top left corner . so i am able to see only 1/4 for rotation ...
-1
votes
1answer
305 views

XNA - 2D Rotation of an object to a selected direction

I'm trying to figure out the best way of rotating an object towards the directional input of the user. I'm attempting to mimic making turns on ice skates. For instance, if the player is moving right ...
-1
votes
1answer
369 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
6k 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
54 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
139 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
122 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
172 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
0answers
82 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 ...
1
vote
1answer
129 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 ...
0
votes
0answers
97 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 ...
9
votes
2answers
498 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 ...
2
votes
1answer
666 views

Problem using glm::lookat

I am trying to rotate a sprite so it is always facing a 3D camera. Object GLfloat vertexData[] = { // X Y Z U V 0.0f, 0.8f, 0.0f, 0.5f, 1.0f, -0.8f,-0.8f, 0.0f, ...
1
vote
1answer
3k views

Rotation of images in Slick2D

I have have a rotation problem in the Slick2d library, the image is just not rotating (ie I set a rotation but no result is shown). Here is the rotation code: if (input.IsKeyDown(Input.KEY_LEFT)) { ...
1
vote
0answers
119 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 ...