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XNA 4 3D Game Development by Example: Beginner's Guide

You're reading from   XNA 4 3D Game Development by Example: Beginner's Guide Create action-packed 3D games with the Microsoft XNA Framework with this book and ebook.

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Product type Paperback
Published in Sep 2012
Publisher Packt
ISBN-13 9781849687089
Length 322 pages
Edition 1st Edition
Languages
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Author (1):
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Kurt Jaegers Kurt Jaegers
Author Profile Icon Kurt Jaegers
Kurt Jaegers
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Table of Contents (16) Chapters Close

XNA 4 3D Game Development by Example Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Introduction to XNA FREE CHAPTER 2. Cube Chaser – A Flat 3D World 3. Cube Chaser – It's A-Mazing! 4. Cube Chaser – Finding Your Way 5. Tank Battles – A War-torn Land 6. Tank Battles – The Big Guns 7. Tank Battles – Shooting Things 8. Tank Battles – Ending the War 9. Mars Runner 10. Mars Runner – Reaching the Finish Line

Time for action – expanding the Camera


  1. 1. In the Helper Methods region of the Camera class, add the following new methods:

    public Vector3 PreviewMove(float scale)
    {
        Matrix rotate = Matrix.CreateRotationY(rotation);
        Vector3 forward = new Vector3(0, 0, scale);
        forward = Vector3.Transform(forward, rotate);
        return (position + forward);
    }
    
    public void MoveForward(float scale)
    {
        MoveTo(PreviewMove(scale), rotation);
    }

What just happened?

PreviewMove() accepts a distance we wish to move along the direction that the camera is facing. It then calculates a matrix which is used to rotate a vector by the current camera rotation. Recall that an unrotated camera will always be pointing in the 0, 0, 1 direction, so we replace the 1 in this vector with the distance we wish to move, creating vector forward. We then apply the rotate transform to this vector, resulting in a vector that points in the direction the camera is actually facing, with a length equal to the distance we want to...

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