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.

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2
votes
5answers
1k views

Converting 2D coordinates from multiple viewpoints into 3D coordinates

Here's the situation. I've got a set of 2D coordinates that specify a point on an image. These 2D coordinates relate to an event that happened in a 3D space (video game). I have 5 images with the ...
4
votes
1answer
1k views

Most efficient way to handle coordinate maps in Java

I have a rectangular tile-based layout. It's your typical Cartesian system. I would like to have a single class that handles two lookup styles Get me the set of players at position X,Y Get me the ...
5
votes
1answer
508 views

Calculate the Z of a line intersection given the XY coordinates?

I'm intersecting a line in 2D and I calculate the X,Y coordinates of the intersection point. What I need is the Z of the intersection point given the X,Y,Z of the line points, and the X,Y of the ...
1
vote
1answer
303 views

3d environments and managing them on iOS

I would like to start learning 3d game development and currently only develop 2d games. A few basic questions I am interested in are: What is used to create the 3d environments? Are they all done in ...
6
votes
5answers
7k views

Changing coordinate system from Z-up to Y-up

Blender's coordinate system is different from what I'm used to, in that Z points upwards instead of Y. What would be the simplest way of converting all the world data (so that all animations, texture ...
3
votes
1answer
1k views

Ray-plane intersection to find the Z of the intersecting point

I have a rectangle in 3d space (p1, p2, p3, p4) and when the mouse rolls over it I need to calculate the exact Z of the point on the rect, given the mouse coordinates (x, y). Would a Ray-plane ...
4
votes
1answer
2k views

Obtaining a world point from a screen point with an orthographic projection

I assumed this was a straightforward problem but it has been plaguing me for days. I am creating a 2D game with an orthographic camera. I am using a 3D camera rather than just hacking it because I ...
6
votes
3answers
5k views

Why / how does XNA's right-handed coordinate system effect anything if you can specify near/far Z values?

I am told repeatedly that XNA Game Studio uses a right-handed coordinate system, and I understand the difference between a right-handed and left-handed coordinate system. But given that you can use a ...
5
votes
2answers
1k views

Coordinates from 3DS Max to XNA 3.5

My problem is this. I have a simple box made in 3DS Max 2009, the Box is 10x10x10. I've tried to load it on XNA and traslate the camera for 15 units, but I can seem to find the values needed to see ...
5
votes
1answer
602 views

Tile coordinates

Simple question I have here. Say my tile map is based on 32x32 tiles for an 800x600 image so let's say 25 tiles across and 19 down. So now I have that cell 0 of any row contains the first 0-31 ...
2
votes
1answer
380 views

Why isn't my world coordinate mapping back to the proper local coordinate?

I'm using XNA and am having a simple issue which I can't figure out. I'm just messing around and want to get a firm grasp of local/world space coordinates. Matrix rotateCharacter= Matrix....
5
votes
3answers
654 views

Is there any algorithm for creating 3D lightning?

Is there any algorithm for generating lightning? Lets say, you input the starting and ending coordinates (x,y,z) and out comes an array of coordinates to show where the lightning goes. It doesn't have ...
21
votes
4answers
7k views

How to deal with differences between 2D screen coordinates and Cartesian coordinates

Most 2D screen/bitmap coordinate systems have the positive Y axis pointing down (with the the origin in the upper left corner). This is counter to how most people think geometrically with the positive ...