Transformation in game development is usually refers to linear algebra operations on points, vectors and matrices.

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3
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2answers
167 views

Translating an object in the rotation direction

I am creating a graphical scene with OpenGL and SDL, and I'm running into a problem in regards to translating an object in its rotation direction. Each of the graphical objects in the scene has a ...
0
votes
2answers
95 views

Cube goes through objects

I have Unity Pro 4.6.1 and I am trying to make a cube move with the arrow keys. Here are the barriers before I move the cube: And here's when I move the cube (the problem): I don't want the ...
5
votes
1answer
231 views

How can I convert OBJ data into CSS3D transformations?

I want to convert the data in a 3D .obj file (vertices, normals, faces) to CSS3D (width, height, rotateX,Y,Z and/or similar transforms). I found a bunch of formulae and what-not, but 3D isn't my ...
3
votes
1answer
540 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
286 views

World to Pixel Transformation

My objects have a location in world coordinates (basically 1.0f is a meter). If I simply draw my objects using their world coordinates, each meter will correspond to a pixel. Obviously that's not what ...
1
vote
1answer
677 views

importing animations in Blender, weird rotations/locations

This is for the Blender 2.6 API. There are two problems: 1. When I import a single animation frame from my animation file to Blender, all bones look fine. But when I import multiple (all of the ...
0
votes
1answer
38 views

Rotation in 3D space using Quaternion

System Configuration I have two simulation systems (which I am going to call Sim-A and Sim-B) where I am going to spawn an entity created in Sim-A inside Sim-B. Expected outcome The entity created ...
0
votes
1answer
477 views

Libgdx, how do i get the translation and rotation of a node from a model instance?

I have a model instance of a character, and a model instance of a sword weapon. THe character has a node on his right hand so he can "carry" the sword. Right now I use this code so the sword's ...
0
votes
1answer
299 views

How to compute matrix transform local/world on OpenGL

I'm developing an OpenGL program where each object / entity contains m_WorldPosition, m_WorldOrientation, m_WorldScale and m_WorldTransform (Vector3, Quaternion, Vector3 and Matrix4f). The problem is ...
0
votes
1answer
332 views

How do I animate Unity GUIComponents?

I want to transform my GUIWindow from the bottom of the screen to the middle whenever the user presses a button. How can I do this?
-1
votes
1answer
28 views

Does Transform.childCount not work correctly?

This is my code: void OnTriggerEnter(Collider collide) { if (collide.gameObject.transform.tag == "Laser") { Debug.Log ("Inside If"); Transform resourceTransform = collide.transform; ...
-1
votes
1answer
31 views

Bullet Physic: Stack transformations on body after adding

How can I stack multiple transformations on a body? I mean... Rotate, translate and then rotate again? If I understood, a transformation on a rigid body can be made like this: btTransform ...
-1
votes
1answer
638 views

Android OpenGLES 2 ray picking, resulting coordinate jumpy in certain spots?

I am trying to implement object picking based on touch coordinates via an intersecting ray test. I am having trouble finding information on converting the touch coordinates to the coordinate system ...
1
vote
0answers
72 views

Transformed Vertices have wrong Z Axis

For quite some time I've been working on my open 3D game engine, to learn how this stuff works. You can see the full codebase relating to my problem here on GitHub. I'm using an OpenGL 3.3 Core ...
1
vote
0answers
73 views

parented/constrained object transform lags when moving character in unity3D

Hi I have a simple raycast-base gun that emits particles along it's path to fake bullets. Whenever I move the camera/character- the particles are misaligned, as well as anything else I try to modify ...
1
vote
0answers
79 views

How do I create a view matrix directly from a quaternion and a position vector?

Given a quaternionic camera such that: typedef struct { vector3 upReference; vector3 rightReference; vector3 forwardReference; vector3 position; quaternion orientation; ...
1
vote
0answers
506 views

Move parent according to child axis in Unity?

Can I ask my parent to move according to the child axis? This means if I turn right, then right again, the parent has to be at 180° from its original position, and not only at 90° (because "Right" ...
0
votes
0answers
12 views

Unity - Decrease/Increase the “Z axis” angle axis on Update()

What is the best way to Decrease/Increase an angle without using "eulerAngles"? I need turn my transform between 30 and 325, according to my "Y axis". If it is less than zero we reduce the value of ...
0
votes
0answers
22 views

What's the implication of right-handedness when building camera to world matrix?

I found these slides which go through the viewing transform in what I think is a easy way. However, I have hard time understanding two thigs: What would be the implication of using a right-hand ...
0
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0answers
23 views

Rotating a directional light about y axis (DirectX11)

I have 2 fixed objects in a scene and a directional light which I am rotating on each update but I am not sure if I am doing it correctly after looking at the results. Here is the code: rot += ...
0
votes
0answers
18 views

What is the convention for column-major order matrix transformations?

According to this cheat sheet for CG, if I want to use column-major order for my matrix/vector math I have to multiply from the left applying transformations from right to left, i.e. v' = P * V * v I ...
0
votes
0answers
35 views

Coordinates estimation

Hi im using artoolkit to extract the coordinates of the marker im detecting with the camera. I need to know the values returned when arGetTransMat is the coordinates (x,y,z) which is returned ...
0
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0answers
45 views

In Java swing, while handling a 2D top down game, how should I handle scaling for quality transformations (mainly screen rotation)

For my top down game, I plan to have screen rotation where entities don't rotate, but everything else does. I am using a raster array to store my image so I don't have to render things stacked on each ...
0
votes
0answers
60 views

OpenGL model transforms wrong on AMD GPU

I've been writing a program that uses OpenGL to display some simple 3D models (rays, cuboids, spheres and simple meshes). I am targeting the programmable pipeline in OpenGL 3.2. So far I have been ...
0
votes
0answers
81 views

Java Slick2D rotating a Shape using transform(Transform.createRotateTransform())

I have spent most of the day trying to debug this tiny piece of code, and I can't for the life of me figure it out. I'm making a pong game for the Mini Ludum Dare currently going on. I am programming ...
0
votes
0answers
90 views

Transformation order for augmented reality game using OpenCV and OpenGL

I'm trying to create a simple AR application where I'm augmenting the camera image of a Kinect with virtual objects that are tracked using an optical tracking system. The following picture ...
0
votes
0answers
292 views

OpenGL - Arcball camera rotation

I'm implementing arcball camera rotation, whereby a camera is looking at a coordinate and rotates around it in the x-axis or the y-axis such that the camera is circulating around it; the y-axis will ...
0
votes
0answers
31 views

Connecting a model's joint to the joint of another model

I am trying to figure out the math behind orientating and translating a model so that a specified point on the model will connect with a specified point on another model. For example, given the ...
0
votes
0answers
57 views

Translate click on screen to point on plane in 3D space

I am creating a 2.5D game with the camera at a slight angle, like so: The grid is the "playing field," and the positive x, y, and z directions are labelled. I already know all the details about ...
0
votes
0answers
71 views

Instantiating and deleting objects with triggers problem

I'm trying to create some kind of dust field, by now I'm just creating small balls for testing, between the bounds of a BoxCollider which I use as my dust field. When the box collider goes outside the ...
0
votes
0answers
328 views

In libgdx, how do I get the intersection of a ray with a model instance?

I am using LibGDX trying to use raypicking to pick a point on a Mesh. I have two methods for this that don't seem to work quite right: /** * @param ray * @param intersection The vector to store ...
0
votes
0answers
64 views

Relative Transformations for Bones

I'm using Blender to export my armatures in relative coordinates, and I'm trying to get to absolute coordinates in my engine. For the above example, the childBone's tip is an offset of [-1,0,0], ...
0
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0answers
78 views

How to translate vertex buffer coordinates in 2D

I am trying to (using a 2D Directx9 engine library) rotate/translate a set of points in a vertex buffer. I understand how this would be done in a 3D system - i.e using the vertex shader stage of ...
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0answers
149 views

Zooming in isometric engine using XNA

I´m currently working on an isometric game engine and right now I´m looking for help concerning my zoom function. On my tilemap there are several objects, some of them are selectable. When a house ...
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0answers
62 views

Rasterizing euclidean planes

I'd like to visualize a BSP tree. To do this, I need to project an arbitrary euclidean plane onto a projection plane. I was thinking about calculating the intersections of the plane with the viewing ...
0
votes
0answers
33 views

Constrain parent node transform to child bounds

If I have some node rendering tree set up, where a node basically has a draw method to render things, and a transform, represented as a 3x3 matrix, with scale and translation. Now, I would like to ...
0
votes
0answers
74 views

Transform a Screen Delta

I have a delta in screen coordinates that I want to transform to a 3d delta in world space. The delta is in this case a movement across the (x,y) coordinates in screen space on the near projection ...