Tagged Questions
Rotation is the circular movement of an object around a specific axis.
1
vote
0answers
14 views
Translate D3DXMatrixLookAtLH to Unity compatible code
I am currently trying to port a really old Game (I have the source of it) to Unity as a fun project. And I'm currently stuck with the object rotation techniques in Unity compared to the ones used in ...
0
votes
1answer
29 views
libgdx sphere rotation after movement
I'm moving my sphere on the screen using this method:
Matrix4 m = myBall.body.getCenterOfMassTransform();
Vector3 translation = new Vector3();
m.getTranslation(translation);
float multiplier = delta ...
0
votes
0answers
28 views
Can you explain the following C# script for camera behavior
Here is the script, it rotates the camera left right with a target "player in this case" rotating with it.
using UnityEngine;
using System.Collections;
public class ControllingCamera : MonoBehaviour ...
0
votes
1answer
102 views
360 degree quaternion interpolation?
I am in the process of implementing interpolation into a simple game loop I am playing with after reading the infamous "fix your timestep" article (which is amazing by the way). I have the position ...
0
votes
1answer
36 views
Getting vector relative to other vector in rotating object
So I have a rotating object a. It is rotating at non-constant speed around it's local x axis. It is parented to object b. When the object a rotates, it's local x axis stays facing the same direction ...
1
vote
3answers
120 views
+50
Box2d set sprite to body that rotates around specific point
I want to rotate kinematic body around a specific point (I already done this part using
shape.setAsBox(1.8f / PPM, 0.2f / PPM, new Vector2(5.2f, 0), 0);
What I try is this:
PolygonShape shape ...
0
votes
1answer
62 views
Rotation around arbitrary vector (using quaternions?)
I currently have a camera which orbits a specific target object, always looking at it.
The user can drag the mouse to move the camera left/right/up/down and the camera will move over the surface of a ...
0
votes
1answer
33 views
Rotate object with mouse look script
I would like to rotate an FPS camera slightly upwards during a shot as an effect of recoil, but the problem is that I have a mouse look script as well and I assume it prevents me from achieving the ...
1
vote
1answer
135 views
Unexpected quaternion rotation behavior
First off let me apologize for the vague title but I really couldn't think of a more descriptive one (maybe after reading this a more advanced user might be able to edit it).
Alright, so I have been ...
0
votes
1answer
32 views
Rotation in animation not working
I have a model of an SMG with arms exported from Blender and set to generic rig in unity import settings. I was creating an animation for this model in Unity Animation tab, it included changes in ...
-3
votes
0answers
85 views
How can I rotate a rectangle 90 degrees when the screen is touched?
Is there a way I can rotate a rectangle in libGDX 90 degrees clockwise when I touch the screen? If you could show an example in code would be great.
0
votes
0answers
52 views
Making the CCTV and its Detection Area Pointing to the Player on Unity 5
I am now playing with the Unity Stealth project.
Goal
I want to make the CCTV pointing to the player (a sphere) instead of playing its rotation.y animation when the CCTV detection area is detecting ...
0
votes
0answers
54 views
How to programmatically create an animation that linearly interpolate between two rotations?
I would like to programmatically create an animation that linearly interpolate between two angles (using the shortest path).
I wrote the following code :
Animation anim = ...
0
votes
2answers
73 views
Aiming direction using mouse
I'm using the following code to rotate my object using mouse, for aiming direction. The only problem with this is that it only rotates between 0 to 180 and not full 360 degrees. Can any help me locate ...
0
votes
1answer
66 views
Libgdx rotate sprite with collision
Im making a game where I have an object in the center of the screen and then balls come out from the sides of the screen. When you touch the screen the object rotates 90 degrees clockwise and it has ...
1
vote
1answer
53 views
Problems making a smooth character rotation
My character has an angle rotation, when the player touches the screen it automatically face to the place that the player touched, using atan2(y,x) and Math.radiansToDegrees methods, but I want it to ...
0
votes
0answers
36 views
NavMesh.SamplePosition() fails after rebaking NavMesh?
So today I was refurbishing a scene when this happened. After baking a new Navmesh the SamplePosition() returned only infinity. I tried a lot of things out but eventually went back to an older version ...
0
votes
2answers
67 views
Moving a ship forward from rotation
I am making a simple space simulator, where the player can control a ship using 2 controls, one for pitch and one for bank. The ship is properly rotated but I cannot figure out how to make the ship ...
0
votes
0answers
16 views
C++ Opengl rotation Rotating vector before transform still rotates around 0,0,0… In world position [duplicate]
So how should I get this to work in local position? (Ie, moving to 4,0,4 and rotating around 4,0,4 . (x,y,z))
Here is where I add models / verticies:
glm::vec4 pos = glm::vec4(1.0);
glm::mat4 ...
0
votes
1answer
38 views
libgdx limit angular speed
I'm working on my top-down game. y characters use pathfinding + steering behaviors(Arrive and FollowPath) to move. I've implemented my character class from libgdx SteeringActor class (from tests). So ...
1
vote
2answers
37 views
Increasing the rotation angle on a quaternion makes the rotation stop at a certain angle
I'm using the following code to change the rotation of an object:
Quaternion rot = getRotation();
setRotation(make_quaternion_axis_angle(rot.v,rotationSpeed*dt)*rot)
This code works as expected ...
1
vote
4answers
92 views
Rotate Sprite towards another sprite
I have a Sprite class like this:
class Sprite
{
double rotation ; // in degrees 0-360
double x;
double y;
}
I'd like to have one sprite to rotate to another point with a constant rotation ...
-1
votes
1answer
40 views
Rotation and Velocity vectors
I've looked through the suggested, but I can't see exactly what I need. I want to calculate the vector needed for forward motion of a rotated sprite. At the moment I have:
sprite.Rotation = ...
-1
votes
3answers
46 views
Changing the central point for transform [duplicate]
I'm trying to rotate all sprites in the view port around a central character.
I have made some progress, using the following I can get my ship to rotate around the coordinates 0,0, with the radius ...
-1
votes
2answers
75 views
Rotation, what is the Matrix?
From a previous question, thank you very much by the way, but what on earth is the Matrix of? I'm very new to Mono/XNA and finding any meaningful documentation is practically impossible.
point = ...
0
votes
1answer
14 views
Rotating the playing field. (MonoGame) [duplicate]
My maths isn't as good as it should be, I need to pick up some reference books on Trig.
Could someone give me an idea of the maths if I wanted to revolve many sprites around a central point?
It's a ...
0
votes
1answer
86 views
How should I rotate vertices around the origin on the CPU?
I have tried using glm::rotate and such. glm::translate works fine, but rotate doesn't work (if I rotate before/after a translation).
Here is my current setup:
glm::vec4 Off = glm::vec4(0, 0, 0, 1);
...
2
votes
1answer
99 views
How to avoid Gimbal Lock on Rubik's Cube [duplicate]
I am making a Rubik's cube program. That will simulate a Rubik's cube. I am having problems with gimbal lock. I need to know how to avoid it. To my understanding I can either multiply the x, y, z ...
0
votes
0answers
24 views
how to pin down a sprite partly in unity?
I am working on a simple do not let the bombs hit the floor game for android. You control a stick which can rotate to left or right depending on where on the screen you touch (left or right). But I ...
1
vote
0answers
36 views
How to find or compute or look for overall/max RPM by simply checking for rotation?
I find it hard to determine the wheel RPM since I'm only making a simple 2D game of rotating object via Z-axis. I wanna try this solution but I got no change since I'm trying to find the RPM from a ...
1
vote
1answer
28 views
Problem finding correct value for Yaw
I use an Arduino and a 9dof sensor ( gyroscope, accelerometer and magnetometer ) and i'm trying to use the pitch, roll and yaw that the sensor gives me to rotate an object in unity.
I managed to ...
1
vote
1answer
34 views
Should I store local forward/right/up vector or calculate when necessary?
I'm working on an object picking and translation/rotation/scale gizmos system in my engine where you select objects and perform transformations on them in a 3d editor-like fashion (e.g. Blender)
In ...
0
votes
1answer
80 views
How to rotate a triangle towards the point in Qt?
I have an issue with items rotating.
I have a point and a triangle which needs to be rotated with its apex point towards the taregt point. The right side of the picture represents how it is should to ...
-1
votes
1answer
75 views
How to pitch, yaw, roll, an object like a flight simulator in OpenGL?
I'm working on a college Graphics project using LWJGL (OpenGL in Java). I've done most of the scene but I got a problem in figuring out the jet's orientation.
Here's how I tried it at the very ...
0
votes
1answer
59 views
Help With Rotating Turret and Muzzle Flare Sprites
I am making a top down game that involved tanks rotating their turrets and firing at other tanks.
I have the turrets rotating independently of the tank itself about the center. However, I am now ...
4
votes
1answer
112 views
Rotate billboard towards camera
I'm trying to create a particle system in OpenGL, and as such I need to use billboards.
I need these billboards to face the camera at all times.
The tutorials I've been following only rotated the ...
0
votes
1answer
64 views
Rotations of a Rubik's cube
I made a Rubik's cube by arranging smaller cubes. Now I want to apply animations to it. For that I am choosing to use the Rotate class and set the angle of rotation and the axis of rotation,like this
...
0
votes
1answer
39 views
Rotation of a cube
I came across the statement "rotation about a pivot and an axis" in javafx. The axis is defined byPoint3D and the pivotX, pivotY and pivotZ are of double type. I could not form a relation about what ...
2
votes
1answer
82 views
Calculating rotation matrix for an object relative to a planets surface in MonoGame
I have a 3D planet and I would like to place models on the planet and have them start with a base rotation relative to the planet surface at their location. So a model at the north pole will have zero ...
1
vote
1answer
59 views
How to calculate a vector for multi-axis rotations from sphere coordinates?
I'm working on a SceneKit project in iOS, trying to rotate a sphere (representing a planet) so that a point at a given longitude/latitude coordinate is facing "forward" (i.e. that point moves to the ...
0
votes
0answers
37 views
Tweening back from arbitrary 3D rotation in javascript
I'm using a 3D javascript library to rotate the vertex of a 3D object with a classic 3x3 matrix, to an arbitrary angle in the 3D space, as depicted in the image below.
For example, a first ...
1
vote
1answer
111 views
Quaternion rotation problems [duplicate]
I want to rotate my model and I have X and Y rotations. Here is my code:
D3DXQUATERNION q, qrotation;
D3DXQuaternionRotationAxis(&q, &D3DXVECTOR3(1.0f, 0.0f, 0.0f), ...
0
votes
1answer
44 views
Rotate sprite direction Cocos2d
I want that my sprite go always forward, and you can only control his direction moving right and left (on 360 degrees). I don't know why, but the movement it's senseless.
The constants to move and ...
0
votes
1answer
58 views
Rotation Continuity help
First the issue im having: Basically its the fact that the angles of a circle aren't continuous, they rise from 0 to 2pi then immediately fall back to 0.
I want to make a game where the player ...
0
votes
1answer
103 views
Earth and sun - How to make the sun revolve around the earth in the following code?
I want to imitate the planetary system with Earth and Sun drawn as solid spheres on the same window. I have drawn the two: the earth as the bigger sphere and the sun as the smaller sphere.
Now I want ...
0
votes
1answer
42 views
Strange Rotation in LWJGL
What I am trying to do is to create a Rubik's Cube game using LWJGL in Java. I have a lot of it done already, the only problem is the rotating. It just isn't working. I've tried multiple ways of ...
1
vote
3answers
52 views
Storing component vectors to avoid matrix and quaternion inaccuracies?
I read that I "should really be storing the component vectors (rotation, translation, scale) in addition to the quaternion and matrix forms." The reason for this is that, over time, compound numerical ...
3
votes
1answer
92 views
How to handle angles in an isometric game?
I am working on my first isometric game, and I am not sure how to go about angles and rotation. Basically, I want the player's forward movement and rotation to coincide with the isometric angles.
I ...
1
vote
0answers
114 views
How can I shoot an arrow if I know the shot power and target?
I am trying to shoot an arrow at a target with a 100% success rate. Given the initial force applied to the arrow, the gravity, the location of the archer, and the location of the target, how can I do ...
2
votes
2answers
53 views
Strange behavior with transformation matrix
I'm fairly new to transformation matrices. I'm using them to translate and rotate nodes and their child nodes. The following code works when applied once, but shows strange behavior when applied many ...
