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###OOOOO###
###O###O###
###O###O###
###OO#OO###
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######P####
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P=Player
#=Ground
O=Wall
opacity (2d tile engine)
Author
I am now at the point where I need to add Opacity to my 2d tile engine. What I mean by opacity is this. Each tile has a set of properties, such as blocked, which determines if you can walk on that tile. Opacity is a property that will tell you if you can see past that tile. If a tile has the property opacity, you will be able to see that tile, but you wont be able to see whats behind that tile. I think this is commonly refered to as Line of Sight Algorithm. I need to know how to do this in the most simplistic way as possible, and the most effecient way as possible.
Example:
My first reaction was to tell you to look up Ray Tracing in Google, but when I did so myself it came up with a bunch of advanced radiosity articles (not good for beginners!).
Basically, you have the player's FOV (Field of View). It is a certain angle wide, say 60°. What you do is trace a line at each intermediary angle (so at 0°, 1°, 2°, etc.) in the FOV until you hit a wall. In that process, you will pass through many ground tiles in your quest to reach a wall. Every ground tile you pass over is visible. And in addition, every wall tile you hit is visible. Everything else is not visible.
I will leave finding how to trace this line up to you
Since your map uses square tiles, tracing a line at a certain angle (and thus a defined slope) and finding which tiles it intersects should be a nice challenge - not too difficult, but just enough to get you thinking, which is what we want!
[edited by - Zipster on September 16, 2002 3:42:45 AM]
Basically, you have the player's FOV (Field of View). It is a certain angle wide, say 60°. What you do is trace a line at each intermediary angle (so at 0°, 1°, 2°, etc.) in the FOV until you hit a wall. In that process, you will pass through many ground tiles in your quest to reach a wall. Every ground tile you pass over is visible. And in addition, every wall tile you hit is visible. Everything else is not visible.
I will leave finding how to trace this line up to you
Since your map uses square tiles, tracing a line at a certain angle (and thus a defined slope) and finding which tiles it intersects should be a nice challenge - not too difficult, but just enough to get you thinking, which is what we want! [edited by - Zipster on September 16, 2002 3:42:45 AM]
By the way, if you want to get some good answers to 2D-style questions, I'd recommend posting your questions at the 2D-Now forums [http://2dnow.zenzer.net]. There are some pretty experienced 2D game developers there, most of whom don't read this forum reguarly.
- Air
[edited by - Air on September 16, 2002 5:26:05 AM]
- Air
[edited by - Air on September 16, 2002 5:26:05 AM]
Also, Amit''s Game Programming has a bunch of interesting reading on LOS:
http://www-cs-students.stanford.edu/~amitp/gameprog.html
2DNow - for the 2D game developer in you
http://www-cs-students.stanford.edu/~amitp/gameprog.html
2DNow - for the 2D game developer in you
Author
thanks guys, ive been looking for a forum specifically for 2d tile engines and stuff
thanks alot!
--Fireking
Owner/Leader
Genetics 3rd Dimension Development
thanks alot!
--Fireking
Owner/Leader
Genetics 3rd Dimension Development
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