3D tutorial Problem

Newbie & Debugging Questions
#1

So I’m following a 3d camera tutorial for lwjgl (found here). But I came across a missing class. I have all my jars correctly installed so i don’t know why this is happening.
[EDIT] I’m asking why that class is missing and how can I find it. The missing class is MatrixUtil.


import org.lwjgl.util.vector.Matrix4f;
import org.lwjgl.util.vector.Vector3f;
import static org.lwjgl.opengl.GL11.*;
public class Camera {
    private float fov;
    private float aspect;
    private float zNear;
    private float zFar;
    private Matrix4f projection;
    private Matrix4f view;
    private Vector3f position;
    private Vector3f rotation;
    private Vector3f xAxis, yAxis, zAxis;

    public Camera(float fov, float aspect, float zNear, float zFar)
    {
        this.fov = fov;
        this.aspect = aspect;
        this.zNear = zNear;
        this.zFar = zFar;

        projection = MatrixUtil.createPerspectiveProjection(fov, aspect, zNear, zFar);
        view = MatrixUtil.createIdentityMatrix();

        position = new Vector3f(0, 0, 0);
        rotation = new Vector3f(0, 0, 0);

        xAxis = new Vector3f(1, 0, 0);
        yAxis = new Vector3f(0, 1, 0);
        zAxis = new Vector3f(0, 0, 1);

        glEnable(GL_DEPTH_TEST);
    }
}

Thanks