• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
Martin Perry

2D game and projection

3 posts in this topic

I am doing 2D platformer game with single screen. For now, I am using classic ortho projection mapped to box with [0,0] - [w, h] of the screen and cetered to put world coordinates point (0,0) to bottom left corner of my screen.

 

Now I have problem witch changing resolution, my game looks different on every one if I calculate world coordinates to match pixels. So obviously not a way to go.

 

What is a correct way? I want to have constant world coordinates on every device and always put everything onto the screen (considering same AR.. for different AR I just will see more sky, but I need to have constant width).

0

Share this post


Link to post
Share on other sites

In pseudo code, I do something like this:

widthratio = screenwidth / levelwidth
levelResize(widthratio)

First, my screen resolution is divided against the native width of my level.  This gives me the ratio I need to either shrink or stretch the level and make it fit within the width of the screen.  Next, I call a method I created which handles the resizing.  This method is also responsible for figuring out the correct thing to do with the height, and it also shrinks everything on the screen according to the widthratio.  That's a simplification of how I handle it.  Don't know if it will work for you, but thought I'd share how I approached the same type of problem.

0

Share this post


Link to post
Share on other sites

Your othro projection width will be fixed to your world size. To handle the aspect ratio difference, you just need to calculate the height of your projection.

 

you want the screen aspect ratio to match the world aspect ratio

worldWidth/worldHeight = screenWidth/screenHeight

 

solve for worldHeight

worldHeight = screenHeight * worldWidth / screenWidth

0

Share this post


Link to post
Share on other sites

For now, I am using this projection matrix (LH)

zFar = 1

zNear = -1

width = screen width

height = screen height

m.M[0][0] = 2.0f / width;
m.M[1][1] = 2.0f / height;
m.M[2][2] = -2.0f / (zFar - zNear);
m.M[3][2] = (zFar + zNear)  / (zFar - zNear); //for RH -1*
m.M[3][3] = 1;

So... I should change height to "screenHeight * worldWidth / screenWidth" ?

0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0