private bool IsVisible(HitRecord record, ILight light)
{
Vector3 lightDirection = light.GetLightDirection(record.IntersectionPoint);
Vector3 hitPos = record.IntersectionPoint;
Vector3 offset = record.RayDirection;
offset = -offset;
offset *= 0.001f;
hitPos += offset;
Ray shadowRay = new Ray(hitPos, lightDirection);
HitRecord shadowHit = objects.Intersect(shadowRay);
Vector3 distance = Vector3.Subtract(light.Position, hitPos);
return(shadowHit != null && (shadowHit.Distance > distance.Length));
}
public bool IsShadowed(ILight light, Tuple4 pointOverSurface)
{
var lightDir = light.GetLightDirection(pointOverSurface);
if (!lightDir.Equals(Tuple4.ZeroVector))
{
var lh = CalculateIntersection(Tuple4.Add(pointOverSurface, Tuple4.Scale(lightDir, Constants.Epsilon)), lightDir);
if (lh.IsHit)
{
var distance = light.GetLightDistance(pointOverSurface);
if (lh.Distance < distance)
{
return(true);
}
}
}
return(false);
}