} // Camera
public void GetFrame(Scene scene, Sampler randomIn, Image image)
{
RayTracer rayTracer = new RayTracer(scene);
int width = image.Width;
int height = image.Height;
float halfAngle = (float)Math.Tan(viewAngle * 0.5f);
#if PARALLEL
Parallel.For(0, height, delegate(int y)
{
var random = randomIn.Clone();
#else
for (int y = 0; y < height; ++y)
{
Random random = randomIn;
#endif
for (int x = 0; x < width; ++x)
{
// make image plane displacement vector coefficients
float xF = (float)((x + random.GetNextSample()) * 2.0f / width) - 1.0f;
float yF = (float)((y + random.GetNextSample()) * 2.0f / height) - 1.0f;
// make image plane offset vector
Vector offset = (right * xF) + (up * yF * (height / width));
// make sample ray direction, stratified by pixels
Vector sampleDirection = (viewDirection + offset * halfAngle).Unitize();
// get radiance from RayTracer
Vector radiance = rayTracer.GetRadiance(ViewPosition, sampleDirection, random, null);
// add radiance to image
image.AddToPixel(x, y, radiance);
}
}
#if PARALLEL
);
#endif
}
}
static double SAVE_PERIOD = 180.0; // seconds
#endregion Fields
#region Methods
/// <summary>
/// Program start. Takes one command line parameter to get a filename
/// </summary>
/// <param name="args"></param>
/// <returns></returns>
static int Main(string[] args)
{
int returnValue = -1;
// catch everything
try
{
// check for help request
if ((args.Length == 0) || (args[0] == "-?") || (args[0] == "--help"))
{
Console.WriteLine(BANNER_MESSAGE);
Console.WriteLine(HELP_MESSAGE);
}
else
{ // execute
int starttime, lastSaveTime;
starttime = lastSaveTime = Environment.TickCount;
bool showPNG = false; // default PPM
if ((args.Length == 2) && (args[1].ToUpper() == "G"))
showPNG = true;
Console.WriteLine(BANNER_MESSAGE);
// get file names
string modelFilePathname = args[0];
string imageFilePathname = Path.GetFileNameWithoutExtension(modelFilePathname);
if (showPNG == true)
imageFilePathname += ".png";
else
imageFilePathname += ".ppm";
// open model file
StreamReader modelFile = File.OpenText(modelFilePathname);
// check model file format identifier at start of first line
string formatId = modelFile.ReadLine();
if (MODEL_FORMAT_ID != formatId)
throw new Exception("Invalid model file");
// read frame iterations
int iterations = (int)modelFile.ReadFloat();
// create top-level rendering objects with model file
Image image = new Image(modelFile);
Camera camera = new Camera(modelFile);
Scene scene = new Scene(modelFile, camera.ViewPosition);
modelFile.Close();
Console.WriteLine("Rendering scene file " + modelFilePathname);
Console.WriteLine("Output file will be " + imageFilePathname);
var rand = new DotNetSampler(); // todo - option to set seed?
// do progressive refinement render loop
for (int frameNo = 1; frameNo <= iterations; ++frameNo)
{
// render a frame
camera.GetFrame(scene, rand, image);
// display latest frame number
Console.CursorLeft = 0;
Console.Write("Iteration: {0} of {1}. Elapsed seconds {2}", frameNo, iterations, (Environment.TickCount-lastSaveTime)/1000);
// save image every three minutes, and at end
if ((frameNo == iterations) || (Environment.TickCount - lastSaveTime > SAVE_PERIOD * 1000))
{
lastSaveTime = Environment.TickCount;
image.SaveImage(imageFilePathname, frameNo, showPNG);
if (frameNo == iterations)
Console.WriteLine("\nImage file {0} saved", imageFilePathname);
}
}
Console.WriteLine("\nfinished in {0} secs",(Environment.TickCount - starttime)/1000.0);
}
returnValue = 1;
}
// print exception message
catch (Exception e)
{
Console.WriteLine("\n*** execution failed: " + e.Message);
}
return returnValue;
}
public RayTracer(Scene scene)
{
this.scene = scene;
}