• 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
jenny_wui

Some suggestion about conversion from pixel coordinate to window (object) coordinate

5 posts in this topic

Hello everybody,
I have extracted some points using OpenCV from video. The imager esolution is ( 640X 480). The extracted coordinates are in pixel coordinates i.e. it looks like follows:

(x, y) : ( 403, 303)
(x, y): (414, 297)

Etc..


Now I would like to display the coordinates in 3D space using OpenGL. I know I need some transformation which involves rotation and translation for conversion from OpenCV to OpenGL pixel coordinates.

In my OpenGL, I also made the window resolution ( 640X480).

Now after transformation of pixel coordinates from OpenCV to OpenGL workspace, I need to display them in 3D object coordinate. Could any one let me know what I have to do for that purpose?

Thanks in advance.       

0

Share this post


Link to post
Share on other sites
I think you need to rephrase your question.
What do you want to draw in 3D? Points? What is preventing you from doing this if you already have the locations of the points?
Rephrase or add information.


L. Spiro
0

Share this post


Link to post
Share on other sites

Hi, I am getting the points in pixel, but I would like to draw in coordinates using glVertex3d( x , y, z); What is the easiest way to convert to coordinates from points? Do I need to do texture mapping for this? Please give me some suggestions.

0

Share this post


Link to post
Share on other sites

I think they're asking for unprojection, though that would probably require a depth value to have any meaningful third dimension.

0

Share this post


Link to post
Share on other sites

Are you just trying to show the video on the screen using OpenGL? - Or why do you wish to use 3D ? 

If you do wish to only display the video, you should just do it in 2D, set up your scene with gluOrtho2D (or equivalent depending on version )

Enable Texturing, load your information into the texture, and draw a textured Quad.

 

I worked on my final year project in college using something similar to this, i was allowed to use OpenCV to get information from the webcam, but that was all - and as far as i remember, the information would be given to you in the format : ptr* char array[640x480x3] { .. r,g,b,r,g,b ...  } - using this information you can build a Bitmap, then use that Bitmap for your texture.

 

If you really want it in 3d for some reason - do what i said above, and just draw your quad at glVertex3f( x, y, z );

0

Share this post


Link to post
Share on other sites

Hi, I fixed that problem, Just try to identify the screen resolution in OpenGL workspace and did some translation for proper mapping. Thanks for the advice.

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