public IntersectionPreComputation(double time,
RayTraceableObject obj,
Point point,
Vector eyeVector,
Vector normalVector,
bool isInside,
Point overPoint)
{
Time = time;
Object = obj;
Point = point;
EyeVector = eyeVector;
NormalVector = normalVector;
IsInside = isInside;
OverPoint = overPoint;
}
public Color CalculateLighting(PointLight light,
Point pointBeingIlluminated,
Vector eyeVector,
Vector normalVector,
bool inShadow,
RayTraceableObject objectBeingDrawn)
{
var materialColor = Pattern?.ColorAt(pointBeingIlluminated, objectBeingDrawn) ?? Color;
var effectiveColor = materialColor * light.Intensity;
var lightVector = (light.Position - pointBeingIlluminated).Normalize();
var ambientContribution = effectiveColor * Ambient;
// Represents the cosine of the angle between the light vector and normal vector
var lightDotNormal = lightVector.Dot(normalVector);
Color diffuseContribution;
Color specularContribution;
if (inShadow || lightDotNormal < 0)
{
// Light is on the other side of the surface
diffuseContribution = Color.Black;
specularContribution = Color.Black;
}
else
{
// Light is on the same side of the surface as the normal
diffuseContribution = effectiveColor * Diffuse * lightDotNormal;
var reflectionVector = (-lightVector).Reflect(normalVector);
// Represents the cosine of the angle between the reflection vector and the eye vector.
var reflectDotEye = reflectionVector.Dot(eyeVector);
if (reflectDotEye < 0)
{
// Light reflects away from the eye
specularContribution = Color.Black;
}
else
{
var factor = Math.Pow(reflectDotEye, Shininess);
specularContribution = light.Intensity * Specular * factor;
}
}
return(ambientContribution + diffuseContribution + specularContribution);
}
public Intersection(double time, RayTraceableObject o)
{
Time = time;
Object = o;
}