private ColorF GetReflectionColor(
Vector3 projectionDirection, List <IObject3D> scene, List <LightSource> lightSources, ImageF environmentMap,
int depth, ref RayIntersectionResult rayIntersectionResult)
{
var reflectDirection =
Vector3.Normalize(Vector3.Reflect(projectionDirection, rayIntersectionResult.NormalVector));
var reflectOrigin = Vector3.Dot(reflectDirection, rayIntersectionResult.NormalVector) < 0
? rayIntersectionResult.HitPoint - rayIntersectionResult.NormalVector * 1e-3f
: rayIntersectionResult.HitPoint + rayIntersectionResult.NormalVector * 1e-3f;
return(CastRay(ref reflectOrigin, ref reflectDirection, scene, lightSources, environmentMap, depth + 1));
}
private void CalculateLightIntensity(
Vector3 projectionDirection, List <IObject3D> scene, List <LightSource> lightSources,
RayIntersectionResult rayIntersectionResult, out float diffuseLightIntensity,
out float specularLightIntensity)
{
diffuseLightIntensity = 0f;
specularLightIntensity = 0f;
foreach (var lightSource in lightSources)
{
var lightSourceDirection = Vector3.Normalize(lightSource.Position - rayIntersectionResult.HitPoint);
var lightSourceDistance = Vector3.Distance(lightSource.Position, rayIntersectionResult.HitPoint);
var shadowOrigin = Vector3.Dot(lightSourceDirection, rayIntersectionResult.NormalVector) < 0
? rayIntersectionResult.HitPoint - rayIntersectionResult.NormalVector * 1e-3f
: rayIntersectionResult.HitPoint + rayIntersectionResult.NormalVector * 1e-3f;
RayIntersectionResult shadowIntersectionResult;
if ((shadowIntersectionResult = SceneIntersect(ref shadowOrigin, ref lightSourceDirection, scene)).IsIntersect &&
Vector3.Distance(shadowIntersectionResult.HitPoint, shadowOrigin) < lightSourceDistance)
{
continue;
}
diffuseLightIntensity += lightSource.Intensity * MathF.Max(
0f, Vector3.Dot(lightSourceDirection, rayIntersectionResult.NormalVector));
specularLightIntensity +=
MathF.Pow(
MathF.Max(
0f,
-Vector3.Dot(
Vector3.Reflect(-lightSourceDirection, rayIntersectionResult.NormalVector),
projectionDirection)),
rayIntersectionResult.Material.SpecularExponent) * lightSource.Intensity;
}
}
