Numeric representation of the location of an entity in the game space. There are multiple forms of coordinate systems to cater to a variety of methods to map position.
0
votes
1answer
34 views
How can I plot points and generate a list of coordinates?
I'm trying to make a game which involves drawing a map. I drew out such a map, with coordinates, in a pixel art program:
Now I would like to get all the coordinate points of the black squares. I ...
0
votes
1answer
82 views
What does “Poser-like” mean?
The Wavefront OBJ exporter of 3DSMax says it can flip YZ axis. Claiming this is "Poser-like". What does this mean?
And what is the exact transformation if we decide to flip?
Is it simply this?
x ...
19
votes
3answers
834 views
What's so different/complicated/useful about vectors?
Forgive me if this isn't considered a real question, but it is something I am genuinely confused about.
I constantly hear other game developers talk about how using vectors are very useful, but also ...
0
votes
1answer
34 views
Importing an object from Blender into a scene, rotation on X axis?
This is my situation:
I save the scene with blender no export with any processing steps.
Blender has x right y up -z into the scene for the view coordinates (OpenGL)
I have x right y up -z into ...
1
vote
0answers
93 views
c++ opengl unproject not working
first of all, sorry for the bad english.
I need to convert my mouse coordinates to world coordinates,
I'm trying to use the glm unproject method.
1280x720 is the size of the window, It's hard coded ...
0
votes
0answers
42 views
How to encode float3 into float2 and back again in HLSL?
Good afternoon,
I am looking to offload some 3D calculations to the GPU without raising my requirements to DX10. Specifically, I am generating densities in 64x64x64 3D blocks, which fit nicely into ...
1
vote
1answer
67 views
Cartesian Coordinates & Layout [duplicate]
The way cartesian coordinations are presented and used is kinda confusing.
When working with 2D the vertical axis is Y, though when working with 3D the vertical axis is Z and Y becomes the "depth" ...
4
votes
1answer
76 views
Can you help me solve the paradox that has confused me about the glViewport and glOrtho functions?
suppose that I have an image that I want to apply as a texture on a geometry (at time we don't consider texture mapping but this image has a certain width and height here it is a 512x512 image)
I want ...
0
votes
0answers
47 views
How do I find the rotation point given a touch anchor, new position and new rotation?
I've got an Cocos2d layer which anchorPoint, position and rotation (according to http://www.qcmat.com/understanding-anchorpoint-in-cocos2d/) vary when the pinch zoom gestures. Everything works fine.
...
10
votes
2answers
433 views
World Bounds - (0, Size) or (-HalfSize, HalfSize)?
When creating a game space in which to move, draw and collide objects, is it better to have the (0,0) point, or the (0,0,0) point, be in the very center of your space, such that the bounds of the ...
0
votes
1answer
52 views
Get rotate angle using a formula
I am developing a game that is being played on a board with the top first tile having the coordinates [0,0], the next one has [0,1], second row has [1,0]... and so on (most likely this would be a ...
1
vote
2answers
143 views
What am I missing? (Converting 2D mouse coords to 3D space)
I'm making a networked game which has a birds-eye view and I'm trying to convert the 2D mouse coordinates into 3D space. Right now I have a perfectly flat grid and it intends to remain perfectly flat, ...
1
vote
0answers
50 views
Rotate view matrix based on touch coordinates
I'm working on an Android game where I need to rotate the camera around the origin based on the user dragging their finger. My view matrix has initial position of sitting on the negative z and facing ...
0
votes
1answer
135 views
Transforming object world space matrix to a position in world space
Im trying to make a function for picking objects with a bounding sphere however I have run in to a problem.
First I check against my my bounding sphere, then if it checks out then I test against the ...
2
votes
2answers
123 views
Calculating specific coordinate along a path
Let's say I have a path comprised of a sequence of points that are connect by lines and arcs. The entire path has some specific length. Let's call that length 100.
What would be the mechanism to ...
2
votes
1answer
119 views
Texturing spherical terrain, seemingly arbitrary distortion
I'm using this algorithm to find texture coordinates on a sphere:
Wikipedia UV Coordinates
I get the famous seam due to the wrong interpolation, but I also get odd distortions on certain points on ...
4
votes
1answer
199 views
2d coordinates vs x/y screen positioning
I have a 2d top-down view tile map game, that generates random color tiles (water colors) as you move the character. I've been positioning elements on screen using the x/y coords (finding a way to ...
0
votes
1answer
58 views
Getting correct direction of the Car [duplicate]
I am building a car racing game using the coordinate system in which I have enemies's cars and the player cars. I want to ask that what is the best way to find the the direction of enemies's cars so ...
0
votes
0answers
53 views
AI in Car game using Coordinate System
I am making car racing game. I built the game in coordinate system. I have a enemies's cars and the player car. I am stuck with the AI of the enemies's cars. I am searching for the ways in which I can ...
1
vote
2answers
256 views
Converting hexagon grid coordinate system
As I have been building on a RTS game based on hexagon grid built in javascript. I stumbled across a problem regarding the coordinate system. Have been trying to implement a A-star system to find ...
1
vote
1answer
63 views
How to handle scaled aspect ratio multiplayer player coordinates
I'm building a cross platform multiplayer game. I'm using pixel graphics and starting at a small 256x144 16:9 aspect ratio That gets scaled up to larger 16:9 resolutions. The graphics look ok however ...
4
votes
1answer
66 views
How to flip coordinate system in Pyglet?
Is there any way I can flip the coordinate system in Pyglet vertically so that y = 0 is at the top of the screen and a higher y value is closer to the bottom? It is really confusing trying to use ...
1
vote
1answer
199 views
How can I convert screen coordinates to world coordinates on the floor (when the y component = 0)?
I am using the Irrlicht Engine and would like to convert the coordinates of the mouse on the screen to the floor of my world. I am currently trying to use
getRayFromScreenCoordinates()
which ...
-2
votes
3answers
89 views
Check for obstacle [closed]
Programming language: Pseudocode
In my program there will be (among others) two variables, called varX and varY. They will have only positive values, but they may be of varying length. They will ...
3
votes
1answer
194 views
Choosing the correct isometric character facing direction
I am currently building a 3D game presented from a 2D isometric viewpoint.
The 3D coordinates start at the top left corner of the screen with x and y increasing towards the right and bottom edges ...
1
vote
0answers
78 views
Rotate Points with Object in world space
I posted this in the original stack overflow then realized that a game-dev specific one exists.
I am working on personal project that requires me to have 4 points surrounding an object (1 at each of ...
-2
votes
1answer
221 views
Game Editor - When screen is clicked, how do you identify what coordinate you clicked?
This is a follow-up to my earlier question:
Game Editor - When screen is clicked, how do you identify which object that is clicked?
Something I've noticed is that picking only calculates a ray and ...
2
votes
2answers
284 views
Why does handedness matter at all?
I'm really trying to understand this from a mathematical viewpoint. After all, numbers are numbers, the chirality or handedness depends on how one interprets it.
Say I've three basis vectors x (1, 0, ...
0
votes
1answer
113 views
Ways to “invert Z-axis” in shader-based core-profile OpenGL?
In my hobbyist shader-based (non-FFP) GL (3.2+ core) "engine", everything in world-space and model-space is by design "left-handed" (and to stay that way), so X-axis goes from -1 ("left") to 1 ...
5
votes
3answers
1k views
Mapping 3D object coordinates to 2D screen coordinates with perspective projection
Sort of following on from where this person was in their topic:
Matrix for 2D perspective
What I have at the moment is a transformation matrix that's defined as follows:
http://pastebin.com/GM6BhP0R
...
1
vote
3answers
887 views
What is the Box2D coordinates system?
I know that for Box2d I need to translate pixels to meters which is easy peasy. However my problem is what is the orientation of Box2D coordinates system? Is this the same as screen one (right += x, ...
1
vote
1answer
260 views
In 2d game logic, should I use pixels or world coordinates?
Currently in my game I handle the logic (collisions, movement) using pixels but I find it very limiting espiecially when thinking about variable speed.
For example Box2D requires you to use ...
0
votes
0answers
189 views
Converting motionevent.getx and motionevent.gety to pixel or Object coordinates in the view
I am trying to draw buttons using OpenGL I have added a Gesture Listener for the GLSurface View now i have motionevent when ever the user touches. My question is how can i convert motionevent.getx and ...
3
votes
1answer
116 views
Calibration of a 6 DOF tracking device
Setting: In our facility we have a 3D laboratory with 3 large displays (two edge-to-edge on orthogonal walls, one on the ground, also edge-to-edge). Its primary use-case is exploring 3D virtual ...
1
vote
1answer
129 views
SimpleOpenNI: Check if user hand is in specific area on image
Concerning our Microsoft Kinect project, we need some help.
We control a robot with our movements tracked by the Kinect sensor. We display the depth image of the Kinect sensor on our screen, so we ...
1
vote
1answer
108 views
Blender 2.6: Move Mesh to X Coordinate of Another Mesh
An example:
There are two planes A and B with the following median points:
( X | Y | Z )
M_A ( 3 | 2 | 2 )
M_B ( 6 | 1 | 1 )
Now I want to move the plane A on the X-axis to the X coordinate ...
11
votes
4answers
1k views
Why is Y up in many Games?
I learned at school that the z-axis is up. It is the same in modeling software like Blender. However in many games the y-axis is up.
What is reason?
3
votes
1answer
152 views
Coordinates on the top left corner or center of the tile
I'm setting up a tile system where every tile has x and y coordinates. Right now I assume that the top left corner of the tile is positioned on it's coordinate on the screen, x = tileX * tileWidth and ...
8
votes
4answers
2k views
Staggered Isometric Map: Calculate map coordinates for point on screen
I know there are already a lot of resources about this, but I haven't found one that matches my coordinate system and I'm having massive trouble adjusting any of those solutions to my needs.
What I ...
0
votes
1answer
174 views
Curiosity on any Smartphones that Run on Android 2.3.3 with Different Screen Reoslution
I have a question regarding about any smartphones that run only in Android 2.3.3. Is the size of screen or the screen resolution is always HVGA or does it have capable of running this OS (Android ...
2
votes
1answer
158 views
Coordinate spaces and transformation matrices
I'm trying to get an object from object space, into projected space using these intermediate matrices:
The first matrix (I) is the one that transforms from object space into inertial space, but since ...
1
vote
1answer
83 views
XNA 3D coordinates seem off
I'm going through a book, and the example it gave me seems like is should work, but when I try and implement it, it falls short.
My Camera class takes three vectors in to generate View and Projection ...
1
vote
1answer
212 views
Precise Touch Screen Dragging Issue: Trouble Aligning with the Finger due to Different Screen Resolution
Please, I need your help. I'm trying to make a game that will drag-n-drop a sprite/image while my finger follows precisely with the image without being offset. When I'm trying on a 900x1280 (in X ...
3
votes
1answer
455 views
Spherical to Cartesian Coordinates
Well I'm reading the Frank's Luna DirectX10 book and, while I'm trying to understand the first demo, I found something that's not very clear at least for me. In the updateScene method, when I press A, ...
12
votes
1answer
276 views
Orthographic unit translation mismatch on grid (e.g. 64 pixels translates incorrectly)
I am looking for some insight into a small problem with unit translations on a grid.
Update and Solved
I solved my own issue. See below for details. Everything in this part of the post turned out to ...
3
votes
1answer
519 views
Convert rotation from Right handed System to left handed
I have Euler angles from a right handed system that I am trying to convert to a left handed system. All the information that I have read online says that to convert it simply multiply the axis and ...
4
votes
2answers
581 views
Get world coordinate under mouse (at a ground plane for Warcraft 3 like movement)
I want to let a unit follow the mouse like in any RTS (Warcraft 3, Starcraft, ...). For that I have a "ground plane" which is defined through 2 vectors, the X and Z axis. Now I need to get the world ...
4
votes
1answer
405 views
Isometric Screen View to World View
I am having trouble working out the math to transform the screen coordinates to the Grid coordinates.
The code below is how far I have got but it is totally wrong any help or resources to fix this ...
1
vote
1answer
2k views
Converting world space coordinate to screen space coordinate and getting incorrect range of values
I'm attempting to convert from world space coordinates to screen space coordinates.
I have the following code to transform my object position
Vector3 screenSpacePoint = ...
0
votes
2answers
220 views
get coordinates of origin of coordinate system in second coordinate system by knowin matrices of one point in bith systems
Situation, two coordinate systems A, B. origins Oa, Ob. I have one point, for which i know modelview matrix (translatoin/orientation) in both systems. And what i need to get is modelview matrix of Ob ...
