public Color GetColor()
{
int r = 0;
int g = 0;
int b = 0;
var totalRays = _Rays.Count;
for (int i = 0; i < _Rays.Count; ++i)
{
var ray = _Rays.ElementAt(i);
List <Intersection> intersections = null;
intersections = (from obj in Scene.Objects
let Ints = obj.Intersects(ray)
where Ints.Distance.HasValue && Ints.Distance.Value > 0
orderby Ints.Distance ascending
select Ints).ToList();
if (intersections.Count > 0)
{
if (intersections[0].Primitive.IsLight)
{
r += intersections[0].Primitive.Diffuse.R;
g += intersections[0].Primitive.Diffuse.G;
b += intersections[0].Primitive.Diffuse.B;
continue;
}
var distance = intersections[0].Distance.Value;
var intersection_position = ray.Position + ray.Direction * distance;
if (intersections[0].Primitive.Reflect == true)
{
var rayI = _Rays.ElementAt(i);
rayI.Position = intersection_position;
rayI.Direction = Vector3.Reflect(rayI.Direction, intersections[0].Primitive.GetNormal(intersection_position));
_Rays[i] = rayI;
--i;
continue;
}
foreach (var light in Scene.Lights)
{
var vecToLight = light.Position - intersection_position;
var directionToLight = vecToLight;
directionToLight.Normalize();
var shadowRay = new Ray(intersection_position, directionToLight);
var lightRayMag = vecToLight.Length();
List <Intersection> shadowRayIntersections = null;
shadowRayIntersections = (from obj in Scene.Objects
let Ints = obj.Intersects(shadowRay)
where Ints.Distance.HasValue &&
Ints.Distance.Value > 0 &&
Ints.Distance < lightRayMag &&
Ints.Primitive != intersections[0].Primitive
orderby Ints.Distance ascending
select Ints).ToList();
var shadowValue = shadowRayIntersections.Count + 1;
var surfaceNormal = intersections[0].Primitive.GetNormal(intersection_position);
float lightIntensity = Vector3.Dot(directionToLight, surfaceNormal) * (1.0f / (vecToLight.LengthSquared()));
if (lightIntensity > 0)
{
r += Convert.ToInt32(intersections[0].Primitive.Diffuse.R * lightIntensity / shadowValue);
g += Convert.ToInt32(intersections[0].Primitive.Diffuse.G * lightIntensity / shadowValue);
b += Convert.ToInt32(intersections[0].Primitive.Diffuse.B * lightIntensity / shadowValue);
}
}
}
else
{
var sunsetColor = new Color(250, 214, 165);
var skyBlue = new Color(135, 206, 235);
var lerpR = (int)MathHelper.Lerp((float)sunsetColor.R, (float)skyBlue.R, ray.Direction.Y);
var lerpG = (int)MathHelper.Lerp((float)sunsetColor.G, (float)skyBlue.G, ray.Direction.Y);
var lerpB = (int)MathHelper.Lerp((float)sunsetColor.B, (float)skyBlue.B, ray.Direction.Y);
r += lerpR;
g += lerpG;
b += lerpB;
}
}
r /= _Rays.Count;
g /= _Rays.Count;
b /= _Rays.Count;
r = (int)MathHelper.Clamp(r, 0, 255);
g = (int)MathHelper.Clamp(g, 0, 255);
b = (int)MathHelper.Clamp(b, 0, 255);
return(new Color(r, g, b));
}
