/// <summary>
/// Default constructor
/// </summary>
/// <param name="source">Ray source</param>
/// <param name="direction">Ray direction</param>
public Ray(Vector3D source, Vector3D direction)
{
Source = source;
direction.Normalize();
Direction = direction;
}
private void GetColor(HitInfo info, Light light, ColorAccumulator colorAccu, int count)
{
Vector3D lightLocation = light.Location;
Vector3D lightNormal = info.hitPoint - lightLocation;
lightNormal.Normalize();
double lambert = Vector3D.DotProduct(lightNormal, info.normal);
if (lambert <= 0)
{
int r, g, b;
r = g = b = 0;
int r2 = 0;
int g2 = 0;
int b2 = 0;
info.hitObject.GetColor(info.hitPoint, ref r, ref g, ref b);
if (info.hitObject.Material != null)
{
var objectMaterial = info.hitObject.Material;
//Phong
if (objectMaterial is SolidColor)
{
if (InShadow(info, lightLocation, lightNormal))
{
return;
}
double phongTerm = Math.Pow(lambert, 20) * (objectMaterial as SolidColor).Phong * 2 * light.Intensity;
r2 = (int)(light.Color.R * phongTerm);
g2 = (int)(light.Color.G * phongTerm);
b2 = (int)(light.Color.B * phongTerm);
var intensityFactor = light.Intensity * -lambert / 255;
colorAccu.R += (int)(light.Color.R * r * intensityFactor) + r2;
colorAccu.G += (int)(light.Color.G * g * intensityFactor) + g2;
colorAccu.B += (int)(light.Color.B * b * intensityFactor) + b2;
}
//Reflection
else if (objectMaterial is Metal)
{
var metal = objectMaterial as Metal;
//double phongTerm = Math.Pow(lambert, 20) * 0.6 * 2 * light.Intensity;
//r2 = (int)(light.Color.R * phongTerm);
//g2 = (int)(light.Color.G * phongTerm);
//b2 = (int)(light.Color.B * phongTerm);
double reflet = 2.0f * (Vector3D.DotProduct(info.normal, info.ray.Direction));
Vector3D direction = info.ray.Direction - info.normal * reflet;
direction.Normalize();
direction += metal.Fuzz * StaticRandom.RandomVectorInUnitSphere(); //Random in cone
//direction.Normalize();
Ray reflect = new Ray(info.hitPoint + direction / 100000, direction);
ColorAccumulator reflectedColorAccu = CastRay(reflect, ++count);
if (reflectedColorAccu != null)
{
var attenuation = metal.Reflection * light.Intensity;
colorAccu.R += (int)(reflectedColorAccu.R * attenuation) + r2;
colorAccu.G += (int)(reflectedColorAccu.G * attenuation) + g2;
colorAccu.B += (int)(reflectedColorAccu.B * attenuation) + b2;
}
}
}
}
}
