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      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.
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ChristOwnsMe

Software Renderer Coordinate Issue

2 posts in this topic

Hello. I am having issues with my coordinate system for my software renderer. Here is a picture of the issue.

[url="http://imgbin.org/index.php?page=image&id=9955"]http://imgbin.org/in...e=image&id=9955[/url]

This is a plan square with vertices defined as
v -0.5 -0.5 -1.5
v -0.5 0.5 0.0
v 0.5 0.5 0.0
v 0.5 -0.5 0.0


When I move the Z of the bottom left point into the negative z, by -1.5 this is what happens.

[url="http://imgbin.org/index.php?page=image&id=9956"]http://imgbin.org/in...e=image&id=9956[/url]

If I move the bottom left point in the +1.5 z direction, this happens.

[url="http://imgbin.org/index.php?page=image&id=9957"]http://imgbin.org/in...e=image&id=9957[/url]

Another interesting thing is that I have to make the UpVector (0,-1,0) to make the points in the positive Y be drawn above the origin.

Any ideas? It seems that when I modify the Z, the points move in very weird directions. Thanks. Edited by ShadowMan777
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How are you projecting the points? Where on the 2D view-plane do you expect the point to be projected if you do the math by hand? Edited by The_Doc
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[quote name='ShadowMan777' timestamp='1350783893' post='4992324']
Another interesting thing is that I have to make the UpVector (0,-1,0) to make the points in the positive Y be drawn above the origin.
Any ideas? It seems that when I modify the Z, the points move in very weird directions. Thanks.
[/quote]

It's because in the screen space the Y increasing downwards, the origin is at the top-left corner, it's easier if you just flip it when projecting.
In the very old days I used this simple formula:

x2d = (fovx * x3d) / z3d + screen_center_x
y2d = -(fovy * y3d) / z3d + screen_center_y
It's not scientific, but worked, the xyz3d are transformed to camera space.

With weird corners behind the screen, you will not get away without cliping. If you draw wireframe, it's enough to cut the edges at a certain distance, but if you draw filled/txtured polygons you'll need to do some extra work. Depending on how many vertices go behind the screen plane you'll get one or two polygons.

hope it helped..
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