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Member Since 18 Sep 2012
Offline Last Active Feb 17 2015 08:46 AM

#5173602 3D Line Equation?

Posted by on 14 August 2014 - 08:36 AM

I've come across some books that are really detailed and go through how they solve something and I prefer. I hate books that just give you an answer without any meaning behind it and expect you to figure out for yourself if you don't have a clue what some symbols might even mean or why nothing is actually showing up on the internet because they have written it down differently.


Anyway, I got passed that and onto the next set of exercises which is about finding the slope, y-intercept for each equation and the number of solutions. Well, I thought that a system of equations had to consist of more than one equation, if they don't, then I am completely lost because not even my previous books showed a system of equations with just one equation...


Anyway, the equation is:


x + y = 7


So the slope would be -1. The y-intercept would be: y = -x + 7.


Earlier in the book it tells you that to find out how many solutions a system of equations has by checking to see if the slopes of both equations are the same. If they are NOT the same, it has one solution, if it does, you then need to find the y-intercept and check to see if b1 and b2 are the same. b1 in this question would be 7.


So I have m1 = -1, and b1 = 7. The answer gives me that, but with m2 = 1/3 and b2 = 2/3, with only one solution.


I know you mentioned that I should focus on the theory and I guess understanding how it works, but I just wish someone could shed some light on this one so I can move on. If all of the exercises are like this, where they are giving me false answers or not explaining how they got the answer, I just don't see the point in the exercises...

#5173549 3D Line Equation?

Posted by on 14 August 2014 - 05:03 AM

I am currently learning from a book called Beginning Maths and Physics for Game Programmers. I had trouble with this book quite early on due to the fact that I had completely forgotten most of the maths I had learnt at school so I went through some Algebra and Linear Algebra books to help me and I feel I am doing better with this book, this time around.


Now, I am confused about a question in the book. It says, "Find the equation of a line connecting the following pairs of points:"


It continues to list a few points for a 2D coordinate system, but the last two is a 3D coordinate system and the two points for one of the questions are:


(2, 0, -1) and (3, 4, 5)


Now, the book doesn't tell you at all how to find out how to get the equation of three points, only two. I have tried applying different ways of doing it, but it never turns out right. I would have thought, when you come to exercises or tasks, you should be at least taught how to do it and not thrown into the dark because you learnt how to do the bare minimum.

#5163811 How does resolution work?

Posted by on 30 June 2014 - 06:22 AM

I've always wondered, when developing a game, there are obviously going to be a lot of different people with different specs and such. This is why you usually provide players with graphical settings so they can adjust it to suit there machines.


Now, I haven't made anything myself as of yet, but currently working on clones of games while adding to my own ideas and documents. How does resolution actually work? When you display a 2D game, you have all of the sprites in specific positions, when you increase the resolution of a game, those positions are going to change and aren't the sizes of the sprites going to change as well?? I have only messed with viewports in SFML before, so not 100% sure on how it all works, or even if that's the right thing to use.


Do you develop your games based around 1920 x 1080, or do you have to reset the positions and sizes of sprites, collision detection, etc. around different resolutions??

#5084190 What library to choose to write games in C + +

Posted by on 08 August 2013 - 11:57 AM

I'm only in my early 20's and I started programming at like 17. I had no experience with any languages and was going into it blind. Didn't really have any idea which forums to go on, I did a bit of research and decided on using C++.


I have to say, it was difficult. I was having trouble with the most basic of programs. I also wasn't committed enough and wasn't studying enough each day.


I've been through a couple of books, some weren't very detailed and didn't really explain some of the basic stuff, so when I moved onto advanced projects, it was tough. I'm actually learning C+11, decided I needed a good book and to have a go at the new standard and I'm doing way better than I did when I first went into programming.


I tried out SDL, got through several lessons, but it just felt messy. A lot of the times my code wasn't working properly. The libraries weren't linking properly. It put me off it to be honest. I've just been learning C++ and dabbled in DirectX which I really enjoyed. Jumped into SFML last week, took a bit to get it up and running, was trying to get it running on Visual Studio 2012, but it just wasn't cooperating, so I went back into the 2010 version and got it up and running. It's so much easier to use. You will get windows and shapes up in minutes of programming. The names of classes, functions, etc. are very easy to understand. They have the documentation on the website.


I would recommend SFML for someone just beginning.