# Tagged Questions

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

3answers
319 views

### Projectile Rotation During Flight (Tank Game)

I have a tank firing projectiles into the air. I want the projectiles to be rotated relative to their position along their flight path. See the diagram I drew in the image below. At any given point ...
1answer
110 views

### How to implement angled surface?

I'am trying to implement 2D platformer game inspired by N game. But the problem is I have no idea how to implement something like this: I have two ideas of how this could be implemented but i don'...
1answer
148 views

### Quaternion rotations & transforms from global to local space

I am trying to solve this problem and getting no where, could really use some assistance. Rotation is defined as X (rotate left/right), Y(rotate up/down), Z(roll) Coordinates are X: Forward/backward, ...
2answers
475 views

### Render 3d object to 2d surface (embedded system)

i am working on an embedded system of a sort, and in some free time i would like to test its drawing capabilities. System in question is ARM Cortex M3 microcontroller attached to EasyMX Stellaris ...
1answer
166 views

### Unity 3D - Rotate towards object with random offsets

Title is a little confusing, but let me explain: I want to make the enemies look at the player, and shoot at him, with random precision, meaning that one time the enemy will shoot a little bit to the ...
1answer
279 views

### FPS horizontal smooth camera rotation

I have a problem, my camera is parented to the FPS Controller prefab, then there is a script I wrote for the rotation of the player horizontally by mouse movement, it all works but the rotation is ...
0answers
48 views

### Rotation matrix is being inconsistent with pitch and roll

I'm calculating the rotation matrix for a turret when it's at an angle in Javascript. I have XYZ co-ords for the turret and target with X being 90 degrees right, Y being straight ahead and Z being ...
2answers
1k views

### Make camera follow and rotate with player without childing it

I want to have a camera, that follow the player, without childing it to the player object. So far I have this one line, that follows the player, but does not rotate with it (meaning the camera should ...
2answers
298 views

### How to make sprite move in any direction?

I have an arrow sprite that rotates based on where my cursor is pointed, I can only make it move up,down,left and right.How about in a diagonal way? //this is the rotation nt x=Gdx.input.getX(); ...
2answers
219 views

### Unity 3D - Confine a gun rotation within certain degrees

I am having troubles making my gun rotate up and down, and have limits, for example, I want the down limit to be 0 degrees, and the up limit to be 90 degrees. Currently I can't figure out how to ...
3answers
163 views

### Unity - Check if object is facing Vector3 coordinates

I am having a hard time figuring this out, I want to have objects that move around randomly, and when they get new coordinates to move towards, face them, and then move. Here's explained: Target ...
3answers
52 views

### How to rotate a whole rectangle by an arbitrary angle around the origin using a transformation matrix?

Suppose, I have a rectangle ABCD. Where, A(0,0), B(7,0), C(7,5) and D(0,5). I want to rotate the whole rectangle by theta = 50°. I know that, a rotation transformation matrix can be used to do ...
0answers
255 views

### Object Rotation with mouse around his axis using Quaternions

I faced a couple of days ago a gimball lock problem , trying to rotate an object on openGL 2.1. I have done some researches and found out that Quaternions could help me. So I implemented the class ...
2answers
1k views

### How to stop rotation every 90 degrees?

I was facing another rotation problem yesterday, that i managed to solve by rotating the object like this : transform.Rotate (speed * Time.deltaTime, 0, 0, Space.World); I tried almost every other ...
1answer
101 views

### How to calculate if a point is contained in rectangular camera viewport with rotation?

I am working with my camera, and am trying to improve it so that I can calculate if a world point is on screen, taking rotation into account. Currently, my camera rectangle is calculated as so: ...
2answers
55 views

### Acceleration and Deceleration During Rotation

I'm attempting to have a sprite rotate in a way where its rotation speed increases until it has reached the halfway point in its rotation, to which it starts to slow down. I'm currently calculating ...
2answers
101 views

### Player rotation issues (Player returns to default forward rotation after releasing keys)

So basically what is happening is that my player rotates and faces the direction that he is currently being steered toward (which is wonderful). But after I release, let's say the A key, meaning he is ...
0answers
117 views

### How to calculate a quaternion rotation between 2 vectors with a specific final up vector?

I know you can calculate the quaternion rotation between 2 vectors with something like this after all the optimizations: quat quat::fromtwovectors(vec3 u, vec3 v) { vec3 w = cross(u, v); ...
3answers
235 views

### How can I find the difference between rotations represented as angles in [0, 360]?

What is the easiest way to find the difference between two 2D rotations/directions? I want to test if one rotation is within 10° of another. I would just subtract, but there are some problems ...
1answer
256 views

### Camera lookAt target changes when rotating parent node

have the following issue.I have a camera with lookAt method which works fine.I have a parent node to which I parent the camera.If I rotate the parent node while keeping the camera lookAt the target , ...
1answer
134 views

### Incomplete mesh using DrawIndexedPrimitives after rotating mesh

Through help on this site I was able to draw the triangles of an unrotated, nonscaled nontransformed mesh created in Blender and exported to OBJ, accurately imported through Assimp and rendered in XNA ...
1answer
96 views

### Problem with Rotation - C#/XNA

I have a projecile(Hook) and the tail of the projectile(yellow balls) TailProjectile class draws a ball at the exact position of the projectile(hook) and let it there until the projectile ends I'd ...
1answer
227 views

### Why is the camera tilting around the z axis when I only specified x and y?

My goal is to program a camera to point towards the mouse cursor. I attached the following script to the Main Camera. using UnityEngine; using System.Collections; public class CameraController : ...
0answers
192 views

### Hinge joint annoying wheels rotation in Unity

I try to made a little skate game prototype in Unity 5 and I just encountered an issue. I added a hinge joint between the board and each of the wheels couples (front and behind) so the board can move ...
1answer
39 views

### How can I modify the UV co-ordinates on a texture so they converge to a point?

I'm building a roof visualiser app, where someone can take a picture of their roof, define its outline, then visualise a new roof texture on it. I'm generating a 3D plane that matches the roof ...
0answers
93 views

### Libgdx polygon ratating

I'm using polygons for collision detection. Here is the code: poly = new Polygon(verticies); poly.setOrigin(100,100); poly.setRotation(45); renderer.setColor(Color.GREEN); renderer.begin(ShapeType....
2answers
266 views

### XNA Rotating a Rectangle?

I am in the process of making a giant shooter game and I have got to the point where I needed to use rectangles to detect bullets and giants hitting the player. I did that however, if you look at this ...
0answers
12 views

### CanDraw in large hierarchical scene with rotation

I've been assigned to write small simulation visualization, that contains thousands of cubes (I know you heard that before). Now I'm working on optimization of stuff that takes place there, but ...
1answer
76 views

### Separate rotation transform from parent

I have a hierarchy like this Body - Head - Arms Currently this works fine in that the Body's transformation is reacting as it should. Being children, the Head and Arms match the Body's ...
1answer
126 views

### Free camera rotation in 3D space

I'm using a view matrix to do camera movement and rotation. viewMatrix = new Matrix4f(); viewMatrix.setIdentity(); Matrix4f.rotate((float) Math.toRadians(rx), new Vector3f(1,0,0), viewMatrix, ...
2answers
376 views

### Lookrotation of a gameObject in just one axis

So I am trying to orient a gameObject ( house in the picture below) which is nothing but a plane and has a 2d texture on it as you see below. The whole game is made on a hex sphere. I am using ...
1answer
118 views

### How can I keep the clicked point under the mouse when rotating? (GLM)

I have a spherical mesh of radius 1, centered at (0,0,0) in world coordinates. I want to rotate the sphere so that the clicked point remains under the mouse at all times. However, I cannot find an ...
0answers
54 views

### I have a script that changes an object to a broken version of itself when clicked, but it keeps rotating the object

So I have made a script in unity that you put on an object and when you click the object it will delete the object and replace it with a broken one I made in blender. My problem is that when I click ...
3answers
400 views

### How to rotate a gameobject to the specific angle

I have tree model that is being rotating .After certain angle it should stop rotating.I have done a sample code.But the tree is not stopping. void Update () { //transform.Rotate (0f,0,0.5f*...
2answers
112 views

### Problems with Rotation Matrices on Certain Axes

Here is what my rotation matrix looks like: public Matrix4f initRotation(float x, float y, float z) { Matrix4f rx = new Matrix4f(); Matrix4f ry = new Matrix4f(); Matrix4f rz = new ...
1answer
417 views

### How to rotate an object along its trajectory path?

I have a missile launcher that uses initial velocity for the trajectory. I edit the launch angle from the editor, and then the script calculates the initial velocity required to land the missile to ...
2answers
5k views

### Rotate an object smoothly by 90 degrees on key press in unity3D

[I saw few similar question on stackexchange but none is solving the purpose.] I want to rotate a 3D object by 90 degrees on different axis on respective inputs. For example if 'a' is pressed, the ...
1answer
89 views

### Rotation with respect to world instead of the object itself using Quaternion.Euler in unity

[Other answers on similar questions on stackexchange didnt help] This script is giving some weird outputs On running this script If I press rightarrow once followed by 's' the object rotates on 'z' ...
1answer
194 views

### glRotatef not rotating simple 2D triangle

I am new to OpenGL and am learning it for the purpose of some simulation that I am doing as part of my research work. I have been following the tutorials given at http://openglbook.com/chapter-2-...
2answers
221 views

### How can I make an object move in four directions relative to its rotation?

I want to make a game object move in directions relative to the direction is facing. That is, If the user presses the "W" key the object goes "forward" if its presses "D" the object goes to its left. ...
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 ...
1answer
87 views

### 3d rotation of a Gunner unit to shoot the target

I'm developing a scenario to shoot incoming targets by a specific gunner unit, however I'm confused to actual logic of shooting an object with a gun. I'm working in 3D environment. I'v target's ...
2answers
3k views

### Calculating the rotational force of a 2D sprite

I am wondering if someone has an elegant way of calculating the following scenario. I have an object of (n) number of squares, random shapes, but we will pretend they are all rectangles. We are ...
1answer
127 views

### In XNA, how do I access a model's dimensions with code?

I'm trying to rotate a model around some axes, but this rotates it around the world origin. I understand that I need to translate the object relative to its own size before rotating it, but I don't ...
1answer
206 views

### What direction is forward when the rotation is (0, 0, 0)?

I'm representing the rotations of my actors (or gameobjects) with euler angles (one float for each axis). And I've always considered the vector (1,0,0) (x,y,z) to be the actor's direction if all ...
2answers
218 views

### How do I calculate rotational impulses in rigid body collisions?

I'm writing a simple 2D physics engine to help me understand the inner workings of physics engines. I'm following Randy Gaul's tutorial which can be found here and It's been extremely useful and ...
1answer
587 views

### unity3d - Instantiate and fire bullet realtive to player rotation in 3D

This is a top-down view but in 3D coordinates, I would like to instantiate and fire a bullet from the player's gun. This script is on a spawner object at the end of the barrel. Also tried putting the ...
1answer
86 views

### Turn the front wheels of a car according to the car's bezier path

I have a 3D car which follows a predefined 3D Bezier path. I want the car's front wheels' rotation to match the car's changing direction. I had the idea to match the wheel's orientation to the ...
1answer
206 views

### How do I rotate a cube around an axis, relative to the camera view?

I want to be able to rotate a cube, either by dragging vertically to rotate it around the Y-axis, or dragging horizontally to rotate it around the X-axis. However, when the camera is rotated 90 ...
1answer
6k views

### Why is my sprite displayed offset from its Box2D body?

I found out about this using a debug renderer. When the game starts, everything is in order. But when a collision happens, the sprite's rotation is way larger than its body. The sprite and body match ...