三维视口到二维图像

这是我的视口类，用于我非常简单的光线跟踪器。

public sealed class ViewPort
{
    public readonly Rectangle3D Rectangle;
    public readonly int Width;
    public readonly int Height;
    public Bitmap Image { get; private set; }
    public ViewPort(Rectangle3D rec, int width, int height)
    {
        this.Rectangle = rec;
        this.Width = width;
        this.Height = height;
        this.Image = new Bitmap(this.Width, this.Height);
    }
    public bool TryRecord(Ray ray)
    {
        Point3D cross;
        if (this.Rectangle.Intersect(ray, out cross))
        {
            this.Image.SetPixel(cross...,ray.Light);
        }
        else
        {
            return false;
        }
    }
}

好的，那么现在我该如何将三维点映射成二维图像呢？非常感谢您的帮助。非常感谢。