public virtual Color GetColor(Vector3d direction, IIntersectionResult intersectionResult, Scene scene)
{
Color3f result = new Color3f();
Color3f surfaceColor = Material.Texture != null?Material.Texture.GetColor(GetUVCoordinates(intersectionResult), 0) : Material.Color;
Color3f reflectionColor = new Color3f();
if (Material.Reflection > 0.0f)
{
// Reflection
Vector3d reflectionVector = VectorHelpers.GetReflectionVector(direction, GetNormal(intersectionResult));
IIntersectionResult reflectionIntersectionResult = scene.GetNearestObjectIntersection(reflectionVector, intersectionResult.Intersection, this);
if (reflectionIntersectionResult != null)
{
reflectionColor = new Color3f(reflectionIntersectionResult.Object.GetColor(direction, reflectionIntersectionResult, scene));
}
}
if (scene.Lights.Count == 0)
{
return(surfaceColor.ToColor());
}
foreach (AbstractLight light in scene.Lights)
{
bool lightVisible = true;
if (light.Position != null)
{
Vector3d lightDistanceVector = light.Position - intersectionResult.Intersection;
double lightDistance = lightDistanceVector.Length();
foreach (AbstractObject3d o in scene.Objects)
{
if (o.GetTopParent() == this.GetTopParent())
{
continue;
}
IIntersectionResult lightIntersectionResult = o.Intersection(Vector3d.Normalize(lightDistanceVector), intersectionResult.Intersection);
if (lightIntersectionResult != null)
{
if (lightIntersectionResult.IntersectionDistance < lightDistance)
{
lightVisible = false;
break;
}
}
}
}
if (!lightVisible)
{
continue;
}
Vector3d normal = GetNormal(intersectionResult);
Vector3d lightDirection = -light.GetDirection(intersectionResult.Intersection);
double distanceSquared = light.GetDistance(intersectionResult.Intersection);
distanceSquared *= distanceSquared;
double normalDotLightDirection = normal.Dot(lightDirection);
double diffuseIntensity = ScalarHelpers.Saturate(normalDotLightDirection);
Color3f diffuse = diffuseIntensity * light.DiffuseColor * light.DiffusePower / distanceSquared;
Vector3d halfwayVector = (lightDirection - direction).Normalize();
double normalDotHalfwayVector = normal.Dot(halfwayVector);
double specularIntensity = System.Math.Pow(ScalarHelpers.Saturate(normalDotHalfwayVector), 16f);
Color3f specular = specularIntensity * light.SpecularColor * light.SpecularPower / distanceSquared;
//return (surfaceColor * (diffuse + specular)).ToColor();
result += diffuse + specular;
}
return((((surfaceColor * result) * (1.0 - Material.Reflection)) + (reflectionColor * Material.Reflection)).ToColor());
}
