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

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28 views

Implementing my own UI sprite class in Unity using shaders: where and how to position the sprites

For learning purposes, I am trying to implement my own UI classes in Unity "from scratch", in the GPU using shaders. I mean, I am trying to use simple 2D sprites either positioned via shaders or ...
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1answer
80 views

Transforming normals along with vertex? (GLSL)

So, I got a model matrix (Via uniform variable) in the shader, is there any way to use the model matrix to transform the normal of a vertex that has been transformed with glm::transform/rotate? If ...
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1answer
30 views

Calculating a matrix to have the model follow terrain

So I've been messing around with 3D graphics in Java (using lwjgl), and I've hit a bit of a roadblock. I have a heightmap and a cube, and I want to find a way to have the cube rotate to follow the ...
2
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1answer
24k views

Correct way to use a GameObject.Find method in Unity C#

I have been following along with a Lynda.com video course to familiarize with Unity. I am currently attempting to grab a reference to a scene's First Person Controller's transform as follows: ...
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1answer
21 views

Bullet: Apply any Transformation to RigidBody?

I'm using Bullet for CollisionDetection. I load a scene from a Collada-File using Assimp. Let's say I want to give every object in the scene a RigidBody with a box as CollisionShape. Right now I first ...
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1answer
38 views

Extract a rotation matrix given a camera direction (vector) and a up vector for the camera?

I am having some issues constructing a rotation matrix from a camera direction vector. The Up vector is computed from the camera direction as such: up = cross(cross(direc,(0,1,0)),direc) How do i ...
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1answer
34 views

How to get an game object to instantiate lower than where It's created?

When I press the collider where my allies spawn I want for them to spawn a little bit lower when I instantiate. I have tried to use Vector 3 and GetComponent, but It gives this error: ...
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2answers
45 views

Fastest way to neutralize scale in the transform matrix?

Let's assume we have 4x4 3D transformation matrix, that is the result of scale, rotation, and translation transforms. How to set its scale to (1,1,1) in the fastest way? Assume also that the matrix is ...
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1answer
727 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 ...
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1answer
38 views

How to compute a transformation matrix that describes each position and rotation on a sphere?

I am having an issue constructing my transformation matrices, for this sphere problem. I know the 3d coordinate of the center, and the radius of, the sphere. Since I know the radius and center ...
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1answer
83 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 ...
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9 views

Clicking an entity with transformation

I am trying to understand how best to implement a click detection function in a 2d JavaScript game. I can demonstrate using a simple example of two square 'entities' which can be selected when ...
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1answer
54 views

SceneGraph in Entity Component System, Transformations

I'm recently learning entity component systems, and started implementing it into my test engine, however I'm having an issue integrating this with scene-graph, which I'm trying for the first time. ...
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1answer
64 views

Rotating A model in 3D so it matches its direction of movement

So I have a model of a spear and when it gets thrown I want to set the orientation of the spear to its direction. ( I also want to use this for other things like bullets pointing in the direction ...
0
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1answer
52 views

Rotate a UI Image exactly 360 degrees over the course of 1 second?

I have a UI Image that I want the user to click and have it rotate 360 degrees once on the z axis. I can get it to rotate through a coroutine but I'm having trouble making it stop once it is started. ...
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1answer
38 views

Error CS1061: doesn't contain a definition for `transfrom' and no extension method `transfrom' of type `PlayerControl' could be found [closed]

I tried finding a solution, but I couldn't find one. I'm getting the error: GameManager.cs(15,46): error CS1061: Type PlayerControl' does not contain a definition fortransfrom' and no extension ...
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0answers
19 views

JBullet & LWJGL Rendering objects with jbullet transform

I tried to render objects with jbullet matrix transform. Its something like that: get float array where is stored matrix then put it to floatbuffer and load to Matrix4f using load() function. Use ...
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1answer
1k 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 ...
2
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2answers
47 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 ...
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1answer
52 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 ...
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0answers
53 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 ...
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0answers
37 views

ASSIMP OpenGL collada and Skeletal Animation

first of all i would like to say that i read everything out there and still did not figure it out quite yet. In my project i need to implement a skinning technique, but before going there i need to ...
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2answers
57 views

Sprite doesn't move

Trying to create a 2d Top down random movement. I have the blendtree setup so that it faces the sprite in the right direction. However, I can't get it move right. It just flips back and forth between ...
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0answers
59 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 ...
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1answer
49 views

Should a transform class store a matrix or seperate position/rotation/scale values?

I'm creating a transform class to make storing the transform of individual objects in a scene easier, but I'm unsure on how to do it. I could create one like this: class Transform { public: ...
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2answers
55 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 ...
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1answer
450 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?
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1answer
76 views

Aspect ratio of drawn quad messed up after rotating

When I draw a quad that is rotating the aspect ratio of the quad gets messed up and the size changes. Gif of what is happening I am confident it has something to do with the way I calculate the size ...
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0answers
28 views

Rotate object from an origin using a transformation matrix

I'm making a project in lib GDX and I want to rotate an object by changing the transform matrix of the sprite batch to one that rotates an object rendered on screen a given number of degrees from a ...
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1answer
98 views

Do matrix manipulations for 3D graphics ever produce singular matrices?

A singular matrix is a matrix that cannot be inverted. The vecmath library, for example, throws a SingularMatrixException if you try to invert a singular matrix. I think I understand what singular ...
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0answers
11 views

Collision Hull not Transformed Correctly

My collision hulls aren't aligned after my "engine" digests them. I used Spine to create my content. So here is the hierarchical model of my bones. Where Root, LoadGame, NewGame, QuitGame, and ...
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1answer
48 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 ...
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1answer
56 views

What is more efficient: Using matrix translation to move a character, or using a vector/scalar?

In 2D or 3D, matrix transformations are used for rotation, scaling, and sheering. However, when it comes to movement, should I go out of my way to use and implement scalar/vector movement, or just ...
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1answer
538 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 ...
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1answer
113 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 ...
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1answer
51 views

Terminology for the way Transformation Matrix Data is treated

I recently asked a question at math stack exchange and realize a similar questions is more suited for this forum, but the original is here: ...
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1answer
93 views

Ball's velocity vector, reflect against a point

I need to calculate the new velocity vector when the ball collides with one of the paddle's corners. Let d be the velocity vector of the ball, r the target velocity vector and n the surface normal ...
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2answers
12k views

How to extract euler angles from transformation matrix?

I have a simple realisation of entity/component game engine. Transform component have methods to set local position, local rotation, global position and global rotation. If transform is being set new ...
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1answer
74 views

Display mesh in front of camera

Im trying to display a mesh in front of the camera and FACING the camera ( I'm developing an small editor in wpf using helix3d). Pretty much something like this question I load my mesh into a ...
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votes
2answers
806 views

Transformations are not correct using GLM and OpenGL

The aim of my program is to render a simple colored triangle in rotation. The rotations are correct if all Z values of my vertices are equals to 0.0f. If one of these values are different of 0.0f the ...
7
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2answers
4k views

How is the gimbal locked problem solved using accumulative matrix transformations

I am reading the online "Learning Modern 3D Graphics Programming" book by Jason L. McKesson As of now, I am up to the gimbal lock problem and how to solve it using quaternions. However right here, ...
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votes
2answers
309 views

Using Unity's `transform.translate()` to translate relative to an object but only using two axis

I'm using transform.translate() to move an object around the world space, relative to the camera that is following it. The camera has an angle of 23 degrees on the X axis. The problem is that when I ...
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3answers
167 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 ...
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1answer
109 views

Transformation by right vector using TransformPoint return an identical position

I think the following code should work. I'm trying to set the position of a GameObject where the pointer currently is, I mean, where the player is looking currently: public void SetTransform ...
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vote
1answer
73 views

Applying Transformation Matrices to VBOs in OpenGL

So I've recently tried to add Vertex Buffer Object Matrix transformation to an OpenGL engine I'm working on. I could go about this by applying the matrix to a copy of each vertex individually, but ...
3
votes
1answer
107 views

Make Camera Look at point using a World transformation matrix?

Variants of this question might have been asked on this site, but none of the answers I found worked in my case. I am trying to make a Camera look at a point. The camera has a world transformation ...
1
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0answers
36 views

SDL and smooth transition between changed movement direction

I have an object at position (x,x). Using SDL keyboard events every time the user presses one of the arrow keys the objects is to be translated (via a glTranslatef() call for the x and y axes) by a ...
4
votes
1answer
730 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 ...
7
votes
2answers
245 views

How do I create a draggable object which snaps to obstacles in the way?

I bring yet-another-drag-with-mouse question (I am using Unity with C#), but with a less common particular detail: the existence of obstacles in the middle of the way trough which dragging occurs (3D ...
6
votes
1answer
300 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 ...