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

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How to keep my player in center of path.?

I want to keep my player in center of the path. I have different paths like strait and 90 degree rotated. I want keep my player moving in center in center like temple run also when I rotate my player ...
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2answers
26 views

What is a good practice for deciding when to use transforms instead of applying force?

I was making several games. I don't understand when I should use addTorque instead of rotate. AddForce instead of position The latest game was a pinball game. I wasn't sure the best way to active ...
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2answers
76 views

Tank bullet shooting

Ok, I'm having a lot of trouble understanding using Matrices for Movement in a 2D game. I currently have a Tank object that has a Matrix3 globalTransform managing the direction Scale and Rotation. ...
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8 views

LibGDX Box2D Body shape transformation

In the following method my player Body is created: public static Body createPlayer (World world) { BodyDef bodyDef = new BodyDef(); bodyDef.type = BodyDef.BodyType.DynamicBody; ...
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1answer
39 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
35 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: 'Assets/...
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1answer
32 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
74 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
41 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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11 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
75 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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2answers
50 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
80 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 ...
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1answer
35 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 ...
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1answer
62 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
71 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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20 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
61 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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47 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
61 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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1answer
159 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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63 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
65 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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1answer
86 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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33 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
102 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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12 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
86 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
59 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
146 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
59 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: http://math.stackexchange.com/questions/1526601/terminology-...
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1answer
109 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
91 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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1answer
107 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
496 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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1answer
91 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 ...
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1answer
123 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 ...
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2answers
57 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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0answers
42 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 ...
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1answer
120 views

Transform.forward having problems after rotation

I have this script, void Update () { float pitch, yaw, roll; pitch = Input.GetAxis ("Mouse Y"); yaw = Input.GetAxis ("Mouse X"); roll=Input.GetAxis ("Roll"); ...
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1answer
48 views

matrix transformations 2D - place in world-space but keep size in “object/screen-space”

I have a question concerning matrix transformations. I Think I know how it could be done, but Im not sure its the best/correct way to do it. I want to apply World translations and rotation to an ...
7
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2answers
275 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 ...
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1answer
168 views

What does glTranslatef function is translating in this code?

I understand translation from mathematics view where we can have a triangle with a certain coordinates. We can translate this triangle by multiplying the coordinates of the triangle (expressed in the ...
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2answers
382 views

ASSIMP transformation hierarchy and animations

I don't fully understand the transformation hierarchy used by ASSIMP. According to the docs (http://assimp.sourceforge.net/lib_html/structai_node.html) an aiNode's transformation is relative to its ...
3
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0answers
128 views

Shadow mapping - Can't get the right texture coordinates

I'm trying to implement shadow maps for Spotlight's, but alas I can't get them to work. I have verified that my fragment shader is getting the shadow map texture. I can sample from it in the ...
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1answer
126 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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1answer
286 views

Unity3d - Transform rotation(angle) help

Im trying to rotate an object 90 degrees to the left but instead of rotating straight left it rotates 270 degrees to the right. Here's the part of the code which controls the rotation: ...
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0answers
115 views

Translation & Rotation Transform Hierarchy

I've struggled to find a hierarchical transform class in C++ that is similar to that of Unity's (without scaling) that uses quaternions as opposed to matrices. So I figured creating my own wouldn't be ...
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1answer
33 views

Adjust postion only in X axis

I have two game objects named A and B, just as follows: I want to move object B to this virtual line without any rotation so that the destination is B' . What I have are transformation of object A ...
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1answer
182 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, ...