The circular movement of an object around a specific axis.

learn more… | top users | synonyms

1
vote
2answers
241 views

Matrix rotation wrong orientation LibGDX

I'm having a problem with matrix rotation in libgdx. I rotate it using the method matrix.rotate(Vector3 axis, float angle) but the rotation happens in the model orientation and I need it happens in ...
0
votes
1answer
85 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 ...
2
votes
0answers
104 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
74 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
77 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 ...
0
votes
0answers
33 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
31 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
64 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
139 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
222 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 ...
1
vote
1answer
515 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 ...
2
votes
1answer
229 views

How to translate swipe gestures into rotations?

I am making a snake game. I want to rotate my snake in the direction specified by swiping on the screen, the directions are limited to orthogonals (90 degree increments). It's an android game. Can ...
1
vote
1answer
528 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
106 views

libgdx get rotated sprite coords points

I would like to get the position of each edge of a sprite when he has been rotated. I have no idea how to do it, I made a image to explain it. I would like to get the X and Y position of each Red ...
1
vote
1answer
122 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
82 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 ...
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 ...
2
votes
0answers
30 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
236 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 ...
6
votes
1answer
614 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
182 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
337 views

How do I determine the look-at vector of a free-look camera?

I'm trying to create a free-look camera with DirectX 10. I've figured out how to get the directions for forward and back and left to right. However, I don't know how to rotate the look-at vector of ...
0
votes
0answers
272 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. // ...
0
votes
0answers
205 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. ...
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
356 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 ...
3
votes
4answers
162 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
0answers
106 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
46 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 ...
1
vote
1answer
273 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 ...
0
votes
1answer
90 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 ...
5
votes
3answers
331 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 ...
-1
votes
1answer
139 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; ...
1
vote
0answers
41 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 ...
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
204 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 ...
6
votes
0answers
234 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
1answer
656 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 ...
0
votes
0answers
145 views

LWJGL Translation Problems with Matrix4f Class

I've just implemented a simple 3D Camera into my current game program using matrices and shaders. (I've basically just implemented the simple camera found here: ...
0
votes
1answer
395 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
133 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 ...
0
votes
0answers
35 views

Bounding box should rotate - Skews instead [duplicate]

I have a method to rotate a sprite's bounding box around the center of the sprite (the sprite rotates and I need the bounding box to rotate with it. The sprite is rectangular). Instead of being ...
1
vote
2answers
146 views

Detecting collision of two sprites that can rotate [duplicate]

I have a problem with collision detection in a 2D Java game. Normally, what I would do is create a getBounds() method for an object that can collide with other objects. This method would return a new ...
1
vote
2answers
192 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
1answer
118 views

pygame - avoiding sprite 'jitters' on rotating the image

Is there a common trick for getting around sprites that are changing directions 'too quickly' and causing their sprite to display erratically? In this project, the player moves in 8 directions by ...
-1
votes
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 ...
0
votes
2answers
192 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
votes
2answers
75 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 ...