/// <summary>
/// Constructs an intersection
/// </summary>
/// <param name="point">The point at which the intersection occurred</param>
/// <param name="normal">The normal direction at which the intersection occurred</param>
/// <param name="impactDirection">The direction the ray was traveling on impact</param>
/// <param name="obj">The object that was intersected</param>
/// <param name="color">The object's raw color at the intersection point</param>
/// <param name="distance">The distance from the ray's origin that the intersection occurred</param>
public Intersection(Vector3 point, Vector3 normal, Vector3 impactDirection, DrawableSceneObject obj, Color color, float distance)
{
this.Point = point;
this.Normal = normal;
this.ImpactDirection = impactDirection;
this.ObjectHit = obj;
this.Color = color;
this.Distance = distance;
}
public Color32Argb(Color color)
{
color = color.Limited;
A = (byte)(255 * color.A);
R = (byte)(255 * color.R);
G = (byte)(255 * color.G);
B = (byte)(255 * color.B);
}
/// <summary>
/// Returns a BGRA32 integer representation of the color
/// </summary>
/// <param name="color">The color object to convert</param>
/// <returns>An integer value whose 4 bytes each represent a single BGRA component value from 0-255</returns>
public static int ToBGRA32(Color color)
{
byte r = (byte)(255 * color.R);
byte g = (byte)(255 * color.G);
byte b = (byte)(255 * color.B);
byte a = (byte)(255 * color.A);
return (r << 16) | (g << 8) | (b << 0) | (a << 24);
}
/// <summary>
/// Linearly interpolates from one color to another based on t.
/// </summary>
/// <param name="from">The first color value</param>
/// <param name="to">The second color value</param>
/// <param name="t">The weight value. At t = 0, "from" is returned, at t = 1, "to" is returned.</param>
/// <returns></returns>
public static Color Lerp(Color from, Color to, float t)
{
t = Util.Clamp(t, 0f, 1f);
return from * (1 - t) + to * t;
}
/// <summary>
/// Returns a new color whose components are the average of the components of first and second
/// </summary>
public static Color Average(Color first, Color second)
{
return new Color((first.backingVector + second.backingVector) * .5f);
}
public Tuple <Bitmap, int, RayTracer.RayTracer, int, DateTime> RayTraceRows(Scene scene, Rectangle viewport, int startRow, int numberOfRowsToTrace, RayTracer.RayTracer raytracer, int numberOfRange)
{
Console.SetCursorPosition(10, 2);
Console.Write(" ");
int maxsamples = (int)raytracer.AntiAliasing;
RayTracer.Color [ , ] buffer = new RayTracer.Color [viewport.Width + 2, numberOfRowsToTrace + 2];
DateTime timestart = DateTime.Now;
Bitmap image = new Bitmap(viewport.Width, numberOfRowsToTrace);
int y = 0;
for (y = startRow; y < (startRow + numberOfRowsToTrace) + 2; y++)
{
for (int x = 0; x < viewport.Width + 2; x++)
{
double yp = y * 1.0f / viewport.Height * 2 - 1;
double xp = x * 1.0f / viewport.Width * 2 - 1;
Ray ray = scene.Camera.GetRay(xp, yp);
// this will trigger the raytracing algorithm
buffer [x, y - startRow] = raytracer.CalculateColor(ray, scene);
// if current line is at least 2 lines into the scan
if ((x > 1) && (y > startRow + 1))
{
if (raytracer.AntiAliasing != AntiAliasing.None)
{
RayTracer.Color avg = (buffer [x - 2, y - startRow - 2] + buffer [x - 1, y - startRow - 2] + buffer [x, y - startRow - 2] +
buffer [x - 2, y - startRow - 1] + buffer [x - 1, y - startRow - 1] + buffer [x, y - startRow - 1] +
buffer [x - 2, y - startRow] + buffer [x - 1, y - startRow] + buffer [x, y - startRow]) / 9;
if (raytracer.AntiAliasing == AntiAliasing.Quick)
{
// this basically implements a simple mean filter
// it quick but not very accurate
buffer [x - 1, y - startRow - 1] = avg;
}
else
{ // use a more accurate antialasing method (MonteCarlo implementation)
// this will fire multiple rays per pixel
if (avg.Distance(buffer [x - 1, y - startRow - 1]) > 0.18) // 0.18 is a treshold for detailed aliasing
{
for (int i = 0; i < maxsamples; i++)
{
// get some 'random' samples
double rx = Math.Sign(i % 4 - 1.5) * (raytracer.IntNoise(x + y * viewport.Width * maxsamples * 2 + i) + 1) / 4; // interval <-0.5, 0.5>
double ry = Math.Sign(i % 2 - 0.5) * (raytracer.IntNoise(x + y * viewport.Width * maxsamples * 2 + 1 + i) + 1) / 4; // interval <-0.5, 0.5>
xp = (x - 1 + rx) * 1.0f / viewport.Width * 2 - 1;
yp = (y - 1 + ry) * 1.0f / viewport.Height * 2 - 1;
ray = scene.Camera.GetRay(xp, yp);
// execute even more ray traces, this makes detailed anti-aliasing expensive
buffer [x - 1, y - startRow - 1] += raytracer.CalculateColor(ray, scene);
}
buffer [x - 1, y - startRow - 1] /= (maxsamples + 1);
}
}
}
image.SetPixel(x - 2, y - startRow - 2, buffer [x - 1, y - startRow - 1].ToArgb());
}
}
//if ( ((y - startRow) / numberOfRowsToTrace * 100) % 10 == 0 )
//{
// Console.SetCursorPosition(10, 3);
// Console.Write(((y-startRow) / numberOfRowsToTrace * 100) + "% ");
//}
}
Console.SetCursorPosition(10, 3);
Console.Write(100 + "% ");
return(Tuple.Create <Bitmap, int, RayTracer.RayTracer, int, DateTime>(image, numberOfRange, raytracer, startRow, timestart));
}
