Rotation is the circular movement of an object around a specific axis.

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0answers
51 views

Draw object to screen without being affected by rotation / zooming [duplicate]

I have a 2D game, with a camera that follows the main player. In the game the camera may also rotate the view around the player / zoom in or out on the player. Let's say I want to add a mini-map to ...
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2answers
311 views

Keep Mini map static after rotating / zooming with camera

Hi I am making a 2D game, where the Camera is able to rotate / zoom in or out on the camera focus (the player usually). However my game also contains a mini-map, and so far whenever I have to rotate ...
0
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2answers
86 views

Angluar movement

I'm making a little game where you are a spaceship and you fly around in 2d using the A and D key to rotate and the W key to accelerate. Now my problem is if i turn my ship it doesn't go into the ...
0
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1answer
48 views

Rotate final image with projection matrix

I'm trying to use space in my shadow (depth) maps in a more efficient way. If I could freely rotate the final image I get with projection matrix I could save a lot of pixels, but I don't know if it is ...
4
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2answers
11k 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 ...
1
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1answer
386 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: ...
2
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4answers
1k 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). ...
10
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6answers
8k 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
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1answer
2k 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
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1answer
502 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
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0answers
37 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
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1answer
418 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, ...
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1answer
663 views

Making player movement direction follow players facing direction

if (controller.isGrounded) { moveDirection = new Vector3 (Input.GetAxis ("Horizontal"), 0, Input.GetAxis ("Vertical")); moveDirection = ...
2
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0answers
2k 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
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1answer
179 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
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1answer
1k 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
4k 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. ...
6
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2answers
1k 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. ...
1
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3answers
1k 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
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0answers
55 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
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1answer
390 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 ...
8
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3answers
487 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
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1answer
670 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
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0answers
396 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
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1answer
432 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: ...
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0answers
3k 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
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1answer
76 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
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1answer
955 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 ...
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1answer
807 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
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2answers
1k 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
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0answers
69 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 ...
2
votes
1answer
212 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 ...
4
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1answer
378 views

Why do these quaterion multiplications produce different results?

I am trying to use quaterions to modify the camera direction vector. This code works perfectly: glm::quat temp1 = glm::normalize( glm::quat((GLfloat)( -Input1.MouseMove.x * mouse_sens * time_step), ...
0
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2answers
879 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 ...
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1answer
1k 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, ...
2
votes
1answer
4k 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 ...
3
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3answers
21k 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 ...
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2answers
2k 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
vote
1answer
34k 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
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0answers
55 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
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1answer
237 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
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0answers
279 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
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2answers
311 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?
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vote
1answer
240 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 ...
4
votes
2answers
519 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 ...
1
vote
0answers
133 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
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2answers
1k 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
266 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
192 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 ...
2
votes
2answers
145 views

Finding the shorter turning direction towards a target

I'm trying to implement a type of movement where the object gradually faces the target. The problem I've run into is figuring out which turning direction is faster. The following code works until the ...