The circular movement of an object around a specific axis.

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2
votes
1answer
93 views

Unity - Quaternion - Rotate / Unrotate Error

I'm trying to unrotate a quaternion, aligning it with the axis, and then rotate it back to where it was originally. But with every iteration it seems to lose precision and just after 20 iterations the ...
3
votes
1answer
787 views

360+ degree rotation skips back to 0 degrees when using Math.Atan2(y, x)

I'm new to XNA and this is my first actual project, so forgive my noobness. I'm using jointAngle = System.Math.Atan2(RightStick.Y, RightStick.X); in order to set an angle of a joint (farseer) so ...
2
votes
1answer
1k views

How can I create my mesh so that textures applied to it are NOT rotated 90 degrees in Unity 3D?

I'm trying a really simple test in Unity 3D. I want to render a texture on the simplest plane possible. So, I've created a two-triangle plane in Blender, then imported it into Unity. From there, I ...
0
votes
1answer
83 views

Camera rotation around point, but without centering

Let's say i have the following: Point somewhere in space Camera with position and orientation (up, right, forward) I want to rotate camera around the point, but also keep this point in same place ...
6
votes
3answers
2k views

How do I make an entity move in a direction?

I have an Entity instance which is updated every game tick. Let's just assume that entity moves forward constantly. I'd like to be able to give the entity's angle to a function that makes it move in ...
0
votes
0answers
70 views

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 ...
2
votes
0answers
95 views

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 ...
0
votes
0answers
59 views

How do I get a sprite's angle after collision?

I'm using Cocos2d (version 3) and I want my hero sprite to be jostled around by incoming enemy sprites. The Chipmunk-based physics work, but I need some way to track the rotation of the sprite after a ...
0
votes
0answers
32 views

XNA 2D Stencil Buffer Rotation

I am currently working on a 2d game related to planets and am trying to get a stencil buffer working with rotation. I currently have a stencil buffer found from another related answer but it refuses ...
0
votes
0answers
28 views

How to find optimal perpendicular axis of rotation vector to draw arrows?

I am drawing lines on the screen. Each line has a point (x,y,z) and a direction (u,v,w). I want to draw arrow heads on these lines, like two lines that start from (x,y,z) and leave at a 15 degree ...
0
votes
0answers
56 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 ...
0
votes
3answers
133 views

OpenGL: glRotatef cause performance drop while rotating -x and -y

I have made a rotating cube and I got some performance drops while using two glRotatef calls. So basically this code is giving me 80FPS: //code 1 GLrotate_x += 0.4f; GLrotate_y += 0.4f; ...
1
vote
1answer
204 views

How can I restrict the rotation of an object to a subset of axes using quaternions?

I've got a question about quaternions in my WebGL application. How can I rotate an object only around two axes? For example, how can I exclude/nullify rotation about the Y axis? The problem is that ...
0
votes
0answers
56 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 ...
6
votes
1answer
506 views

OpenGL ES object rotation around z axis

I have an object on my screen which is presented rotated and panned, But i have 2 problems regarding the z axis rotations. It's a bit tricky to explain so i uploaded 2 videos to describe each problem. ...
1
vote
1answer
220 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
1answer
227 views

Moving an object toward another object on sphere knowing their quaternions

I have a sphere centered in world origin. On the sphere surface I have two objects and I know their quaternions (rotation around sphere). Currently my movement works on Vector2 inputs (cannot change ...
1
vote
1answer
431 views

Movement and rotation of bodies in top down game

We are developing a 2D top down game with libgdx using the included box2d as physics engine. We don't want our bodies to accelerate but to instantly move with the wanted velocity. The bodies are ...
1
vote
1answer
342 views

Unity objects not rotating around pivot point

Suddenly, for some reason, objects in the unity editor started rotating around their center of gravity (at least that's what I think is going on) instead of their pivot point. I tried placing the ...
1
vote
1answer
106 views

JavaScript: Rotating a canvas around its center for a 2D sidescroller

I've been making a 2D sidescrolling game using JavaScript and HTML. The game is set in space, where the player character can fly around (Up, Down, Left and Right keys) and rotate the world around him ...
1
vote
0answers
77 views

Rotating SpriteBatch clockwise [closed]

I have developed a 2D game that looks great on the Android. Now I want to make it cross-platform. For this I need to literally rotate everything when it is on desktop. I tried to do that by rotating ...
1
vote
1answer
156 views

Bounding Box in Monogame for mouse picking

Hello guys so I'm implementing this mouse manager to be able to pick up objects. My application uses mainly textured quads in 3d space. I'm using bounding boxes in monogame to do so, however my ...
0
votes
1answer
54 views

Rotating image around a given point

Im trying to simulate shadows in a 2d RPG, So far I can make the shadows but i cant blit them properly, Im trying to rotate them according to where the "sun" is (just a position) I have looked at ...
0
votes
1answer
234 views

Andengine Rotate Wheel with fast acceleration

I have a Wheel sprite and i am rotating it using Physics RevoluteJointDef. Its rotating. But problem is how i can make wheel to start moving fast. It took the speed after sometime like real. // ...
2
votes
0answers
29 views

Xna 4 Model Rotation with inertia not working as expected with variable updates

I am trying to rotate a model with inertia damping with the keyboard. The code works great with a fixed time step but it doesn't behave the same with a variable update frequency. Update method: ...
4
votes
1answer
228 views

How do I make a cube move by rolling?

I am learning jMonkeyEngine by making some small games with it. I have a simple rectangular cube that I want the player to be able to roll around the game world. When he presses the arrow keys, the ...
2
votes
0answers
709 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
0answers
189 views

Spin wheel with gesture in Andengine

I want to implement Fortune wheel in Andengine. The wheel would start spinning based on the speed of a finger fling. Then it would stop slowly like real Fortune wheel. What I am able to do now is to ...
0
votes
0answers
21 views

How do I scale and rotate around different points in Libgdx? [duplicate]

I'm using a SpriteBatcher to rotate and scale a TextureRegion in libGDX. I'd like to rotate the texture around an origin outside of the region, but have the texture scaled around the region's center. ...
2
votes
5answers
3k views

How to make something rotate a certain amount over an exact amount of time

I'm trying to make a plane rotate down a certain amount and 180 degrees horizontally over 2 seconds. Basically I want it to take the plane 1 second to rotate to a horizontal-facing angle, then take ...
3
votes
4answers
157 views

Calculate turn rate between xy and target xy on a moving sprite with variable speed

My First question on here so be kind... I am writing an aerodrome simulator in as2, I need to calculate a turn rate between 2 points so that the aircraft turns nicely. I have tried a few things but ...
0
votes
1answer
65 views

How to spin an object on its own axis?

I'm trying to spin up my own 3D vector graphics engine, so I'd like to do this without an existing library. And I don't seem to be able to find the math for the correct approach in rotating an object ...
0
votes
1answer
276 views

How to get plane rotation by known normal vector

I have a FPP quaternion Camera and Plane with known normal vector. I want to find the orientation of this Plane so I can replace it to the Camera orientation to put the camera forward vector to a ...
0
votes
0answers
90 views

LWJGL Rotating is moving

I am trying to rotate my QUAD even just a little bit. I have read pages like http://www.java-gaming.org/topics/lwjgl-tutorial-series-moving-and-rotating-triangle/30679/view.html In my render() ...
1
vote
1answer
45 views

Find out which way to rotate based on current rotation and final rotation [duplicate]

I have one object that I want to rotate to a certain angle with 'smooth' rotation. I looked up on how to solve that and I came up with this: enter image description here But how do I know in what ...
2
votes
2answers
819 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. ...
1
vote
1answer
227 views

Rotating a GameObject around its center

I'm trying to rotate a GameObject that consists of several cubes around its center of gravity on an axis. When using transform.Rotate(), it rotates around its pivot point (as shown in picture 1) and ...
5
votes
3answers
327 views

How do you calculate the rotational velocity of a flying object?

When a arrow shaped object is fired it slowly adjusts it's rotation to match the direction it is moving. But what is the actual physics behind it? The question is: How many degrees does the ship ...
0
votes
1answer
87 views

Jittery Rotational Movement with Arcball implementation

I have an assignment where I need to implement arcball using Opengl (~2.0). I have it more or less implemented but I have a some problems/issues/bugs and I'm not sure whats either causing them or how ...
-1
votes
1answer
116 views

lerp z rotation towards mousepointer

I am trying to get transform.rotation.z to chase the mouse pointer at a rotation speed. But I get a very weird results and can't figure out what I am doing wrong. var mp = Input.mousePosition; ...
0
votes
1answer
338 views

LWJGL Camera Rotation Issues

I am quite new to LWJGL and OpenGL and I am trying to create an FPS camera. I had no problem with 2D stuff, so I decided to step things up and try and make some things in 3D. I have this 3D camera ...
2
votes
1answer
131 views

How do I rotate a bounding box together with a sprite?

I have a game object with a sprite that can rotate. It's a rectangle. I need its bounding box to rotate with it. How do I make sure that they can both rotate, but they're always both at the same ...
1
vote
2answers
167 views

How can obtain the relative orientation between two quaternions?

How do I obtain the relative orientation given two orientations (represented by quaternions q0 and q1)?
1
vote
0answers
40 views

Calculating Friction due to rotation from ball bounce? [duplicate]

In this question asked by codemonkey, The rotation will depend upon: upon impact, on: Initial Speed of the ball hitting the surface (magnitude of ball velocity vector) Friction co-efficient of ball ...
6
votes
0answers
220 views

Rotation pitch/yaw reverse problems when picking a tile (2.5D) [closed]

Set-up: 3D world, isometric sprite rendering (4 fixed angles). This transform matrix is used as camera: _transform = Matrix.CreateRotationZ(Roll) * ...
2
votes
0answers
52 views

How should I model rotation caused by bounce friction? [duplicate]

In my Java2D simulation, I have a disc which, when it bounces off the boundary of a 2D region, begins to rotate, as if it had gotten some spin from the wall. I'm having trouble relating the ...
2
votes
1answer
191 views

How to make bullets follow a rotating sinewave pattern

I am trying to replicate the wave gun from Super Metroid where the bullets fly along a sine wave path. The cool part is that you can shoot in 8 directions and the bullet still follows the sine as if ...
5
votes
2answers
564 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. ...
2
votes
1answer
553 views

How do I make an object face the mouse position, but only on one plane?

I want a game object to turn and look towards where the mouse was clicked (in world space). It works well when considering all 3 dimensions, but I really only care for the plane formed by the x and z ...
1
vote
1answer
55 views

Camera Aligned To Sphere Surface

I am writing a planet renderer and have come across a problem that is really limiting the usability of the program. When I am on the planet (anywhere but the north pole) I cannot rotate the camera to ...