/**
* RenderScene
*/
public void RenderScene (Canvas canvas, int width, int section, int nsections)
{
Vector view = camera.GetViewDir ();
Vector up = camera.GetOrthoUp ();
Vector plane = new Vector ();
Vector horIncr = new Vector ();
Vector vertIncr = new Vector ();
double ylen = camera.GetFocalDist () * (double)Math.Tan (0.5f * camera.GetFOV ());
double xlen = ylen * canvas.GetWidth () / canvas.GetHeight ();
Point upleft = new Point ();
Point upright = new Point ();
Point lowleft = new Point ();
Point basepoint = new Point ();
Point current;
Ray eyeRay = new Ray ();
int ypixel, xpixel;
RayID = 1;
plane.Cross (view, up);
view.Scale (camera.GetFocalDist ());
up.Scale (ylen);
plane.Scale (-xlen);
upleft.FindCorner (view, up, plane, camera.GetPosition ());
plane.Negate ();
upright.FindCorner (view, up, plane, camera.GetPosition ());
up.Negate ();
plane.Negate ();
lowleft.FindCorner (view, up, plane, camera.GetPosition ());
horIncr.Sub (upright, upleft);
horIncr.Scale (horIncr.Length () / ((double)canvas.GetWidth ()));
vertIncr.Sub (lowleft, upleft);
vertIncr.Scale (vertIncr.Length () / ((double)canvas.GetHeight ()));
basepoint.Set (upleft.GetX () + 0.5f * (horIncr.GetX () + vertIncr.GetX ()), upleft.GetY () + 0.5f * (horIncr.GetY () + vertIncr.GetY ()),
upleft.GetZ () + 0.5f * (horIncr.GetZ () + vertIncr.GetZ ()));
eyeRay.SetOrigin (camera.GetPosition ());
int xstart = section * width / nsections;
int xend = xstart + width / nsections;
MainCL.logger.InfoFormat ("+" + xstart + " to " + (xend - 1) + " by " + canvas.GetHeight ());
for (ypixel = 0; ypixel < canvas.GetHeight (); ypixel++) {
current = new Point (basepoint);
for (xpixel = 0; xpixel < canvas.GetWidth (); xpixel++) {
if (xpixel >= xstart && xpixel < xend) {
Color color = new Color (0.0f, 0.0f, 0.0f);
eyeRay.GetDirection ().Sub (current, eyeRay.GetOrigin ());
eyeRay.GetDirection ().Normalize ();
eyeRay.SetID (RayID);
this.RayID = this.RayID + 1;
Shade (octree, eyeRay, color, 1.0f, 0, 0);
canvas.Write (Brightness, xpixel, ypixel, color);
}
current.Add (horIncr);
}
basepoint.Add (vertIncr);
}
MainCL.logger.InfoFormat ("-" + xstart + " to " + (xend - 1) + " by " + canvas.GetHeight ());
}
/**
* 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 ();
}
}
/**
* FindLightBlock
*
* @param tree
* @param ray
* @param maxt
* @return boolean
*/
private bool FindLightBlock (OctNode tree, Ray ray, double maxt)
{
OctNode current = tree.FindTreeNode (ray.GetOrigin ());
IntersectPt test = new IntersectPt ();
Point testpt = new Point ();
while (current != null) {
ObjNode currentnode = current.GetList ();
while (currentnode != null) {
bool found = false;
if (currentnode.GetObj ().GetCachePt ().GetID () == ray.GetID ()) {
found = true;
}
if (!found) {
test.SetOrigID (0);
if (currentnode.GetObj ().Intersect (ray, test)) {
if (test.GetT () < maxt) {
return (true);
}
}
}
currentnode = currentnode.Next ();
}
OctNode adjacent = current.Intersect (ray, testpt, test.GetThreshold ());
if (adjacent == null) {
current = null;
} else {
current = adjacent.FindTreeNode (testpt);
}
}
return (false);
}
/**
* 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);
}
}