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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1answer
146 views

Degrees to Coordinates

Hey, I'm creating my second game ever, but this time - using Java. Before I used Pascal and CRT module! =D It's 2D game where you need to drag the ball with mouse from location A to location B. Right ...
2
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1answer
681 views

What are the texture coordinates for a tetrahedron

EDIT This is the WebGL code for initializing the tetrahedron points. You may want to skip to the second code block, because you may be able to answer without this. //Making a tetrahedron with ...
2
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2answers
438 views

Swapping axis labels between 2D and 3D coordinates

My game world is 3D. The map is only 2D, however. It is natural to think of the map as having an X and Y axis. And it is natural to think of the world has having an X, Y and Z axis, where Y is ...
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2answers
764 views

Half-Life 2 BSP Lightmaps

I'm writing a BSP viewer for a university project. So far I have the main geometry loaded properly, and the PVS working. Now I'm trying to apply the lightmaps, but I can't seem to get the texture ...
1
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2answers
485 views

Rotating coordinate system

Lets say that you want to rotate simple cube around fixed point in center. Is it possible to use such coordinate system, that you need to use only sine and cosine in order to rotate? I have done ...
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3answers
589 views

Starting off with coordinate systems [closed]

Where is a good place to start with learning how to program custom coordinate systems in a 3d environment? Are there any good books on he topic of gaming coordinate systems? I would like to build a ...
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1answer
1k views

Converting to and from local and world 3D coordinate spaces?

I've been following a guide I found here (http://knol.google.com/k/matrices-for-3d-applications-view-transformation) on constructing a matrix that will allow me to 3D coordinates to an object's local ...
2
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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
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1answer
933 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
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1answer
495 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
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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 ...
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5answers
5k 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 ...
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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
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1answer
1k 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
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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 ...
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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
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1answer
583 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
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1answer
366 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= ...
5
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3answers
639 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 ...
20
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4answers
6k 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 ...