/**
* GetLightColor
*
* @param tree
* @param point
* @param normal
* @param currentObj
* @param color
*/
private void GetLightColor (OctNode tree, Point point, Vector normal, ObjectType currentObj, Color color)
{
Ray shadow = new Ray ();
LightNode current = lights;
double maxt;
while (current != null) {
shadow.SetOrigin (point);
shadow.GetDirection ().Sub (current.GetLight ().GetPosition (), point);
maxt = shadow.GetDirection ().Length ();
shadow.GetDirection ().Normalize ();
shadow.SetID (RayID);
this.RayID = this.RayID + 1;
if (!FindLightBlock (tree, shadow, maxt)) {
double factor = Math.Max (0.0f, normal.Dot (shadow.GetDirection ()));
if (factor != 0.0) {
color.Mix (factor, current.GetLight ().GetColor (), currentObj.GetMaterial ().GetDiffColor ());
}
}
current = current.Next ();
}
}
/**
* Shade
*
* @param tree
* @param eyeRay
* @param color
* @param factor
* @param level
* @param originID
*/
private void Shade (OctNode tree, Ray eyeRay, Color color, double factor, int level, int originID)
{
Color lightColor = new Color (0.0f, 0.0f, 0.0f);
Color reflectColor = new Color (0.0f, 0.0f, 0.0f);
Color refractColor = new Color (0.0f, 0.0f, 0.0f);
IntersectPt intersect = new IntersectPt ();
OctNode baseoctn = new OctNode ();
Vector normal = new Vector ();
Ray reflect = new Ray ();
Ray refract = new Ray ();
double mu;
int current;
if (intersect.FindNearestIsect (tree, eyeRay, originID, level, baseoctn)) {
intersect.GetIntersectObj ().FindNormal (intersect.GetIntersection (), normal);
GetLightColor (baseoctn, intersect.GetIntersection (), normal, intersect.GetIntersectObj (), lightColor);
if (level < MaxLevel) {
double check = factor * (1.0f - intersect.GetIntersectObj ().GetMaterial ().GetKTran ()) * intersect.GetIntersectObj ().GetMaterial ().GetShininess ();
if (check > MinFactor) {
reflect.SetOrigin (intersect.GetIntersection ());
reflect.GetDirection ().Combine (eyeRay.GetDirection (), normal, 1.0f, -2.0f * normal.Dot (eyeRay.GetDirection ()));
reflect.SetID (RayID);
this.RayID = this.RayID + 1;
Shade (baseoctn, reflect, reflectColor, check, level + 1, originID);
reflectColor.Scale ((1.0f - intersect.GetIntersectObj ().GetMaterial ().GetKTran ()) * intersect.GetIntersectObj ().GetMaterial ().GetShininess (),
intersect.GetIntersectObj ().GetMaterial ().GetSpecColor ());
}
check = factor * intersect.GetIntersectObj ().GetMaterial ().GetKTran ();
if (check > MinFactor) {
if (intersect.GetEnter ()) {
mu = 1.0f / intersect.GetIntersectObj ().GetMaterial ().GetRefIndex ();
current = intersect.GetIntersectObj ().GetObjID ();
} else {
mu = intersect.GetIntersectObj ().GetMaterial ().GetRefIndex ();
normal.Negate ();
current = 0;
}
double IdotN = normal.Dot (eyeRay.GetDirection ());
double TotIntReflect = 1.0f - mu * mu * (1.0f - IdotN * IdotN);
if (TotIntReflect >= 0.0) {
double gamma = -mu * IdotN - (double)Math.Sqrt (TotIntReflect);
refract.SetOrigin (intersect.GetIntersection ());
refract.GetDirection ().Combine (eyeRay.GetDirection (), normal, mu, gamma);
refract.SetID (RayID);
this.RayID = RayID + 1;
Shade (baseoctn, refract, refractColor, check, level + 1, current);
refractColor.Scale (intersect.GetIntersectObj ().GetMaterial ().GetKTran (), intersect.GetIntersectObj ().GetMaterial ().GetSpecColor ());
}
}
}
color.Combine (intersect.GetIntersectObj ().GetMaterial ().GetEmissColor (), intersect.GetIntersectObj ().GetMaterial ().GetAmbColor (),
AmbLightIntensity, lightColor, reflectColor, refractColor);
}
}