private Vector3 ShadeRec(Vector3 V, RTLight lgt, IntersectionRecord rec)
{
RTMaterial m = mSceneDatabase.GetMaterial(rec.MaterialIndex);
Vector3 r = Vector3.Zero;
float percentToUse = 1f;
if (mComputeShadow)
percentToUse = lgt.PercentVisible(rec.IntersectPosition, rec.GeomIndex, mSceneDatabase);
if (percentToUse > 0f)
{
Vector3 L = lgt.GetNormalizedDirection(rec.IntersectPosition);
float NdotL = Vector3.Dot(rec.NormalAtIntersect, L);
if (NdotL > 0)
{
Vector3 diffColor = m.GetDiffuse(mSceneDatabase, rec);
Vector3 lightColor = percentToUse * lgt.GetColor(rec.IntersectPosition);
r += diffColor * NdotL * lightColor;
Vector3 R = 2 * NdotL * rec.NormalAtIntersect - L;
float VdotR = Vector3.Dot(V, R);
if (VdotR > 0)
r += m.GetSpecular(mSceneDatabase, rec) * (float)Math.Pow(VdotR, m.GetN) * lightColor;
}
}
return r;
}
private Vector3 ShadeRec(Vector3 V, RTLight lgt, IntersectionRecord rec)
{
RTMaterial m = mSceneDatabase.GetMaterial(rec.MaterialIndex);
Vector3 r = Vector3.Zero;
float percentToUse = 1f;
if (mComputeShadow)
{
percentToUse = lgt.PercentVisible(rec.IntersectPosition, rec.GeomIndex, mSceneDatabase);
}
if (percentToUse > 0f)
{
Vector3 L = lgt.GetNormalizedDirection(rec.IntersectPosition);
float NdotL = Vector3.Dot(rec.NormalAtIntersect, L);
if (NdotL > 0)
{
Vector3 diffColor = m.GetDiffuse(mSceneDatabase, rec);
Vector3 lightColor = percentToUse * lgt.GetColor(rec.IntersectPosition);
r += diffColor * NdotL * lightColor;
Vector3 R = 2 * NdotL * rec.NormalAtIntersect - L;
float VdotR = Vector3.Dot(V, R);
if (VdotR > 0)
{
r += m.GetSpecular(mSceneDatabase, rec) * (float)Math.Pow(VdotR, m.GetN) * lightColor;
}
}
}
return(r);
}
/// <summary>
/// Lights: can be access as an array, the collection is a simple array
/// </summary>
/// <param name="l"></param>
public void AddLight(RTLight l)
{
l.SetResourceIndex(mAllLights.Count);
mAllLights.AddResource(l);
}
public CommandFileParser(String cmdFile, ContentManager meshLoader, System.Windows.Forms.TextBox statusArea, RTCore rt, SceneDatabase scene)
{
mStatusArea = statusArea;
mFullPath = System.IO.Path.GetFullPath(System.IO.Path.GetDirectoryName(cmdFile));
mParser = new XmlTextReader(cmdFile);
mParser.WhitespaceHandling = WhitespaceHandling.None;
ParserRead();
while (!IsEndElement("RayTracer_552"))
{
if (IsElement() && (!IsElement("RayTracer_552")))
{
if (IsElement("camera"))
{
RTCamera c = new RTCamera(this);
rt.SetCamera(c);
ParserRead();
}
else if (IsElement("sphere"))
{
RTSphere s = new RTSphere(this);
scene.AddGeom(s);
ParserRead();
}
else if (IsElement("rectangle"))
{
RTRectangle r = new RTRectangle(this);
scene.AddGeom(r);
ParserRead();
}
else if (IsElement("triangle"))
{
RTTriangle t = new RTTriangle(this);
scene.AddGeom(t);
ParserRead();
}
else if (IsElement("mesh"))
{
RTTriangle.ParseMeshForTriangles(this, meshLoader, scene);
ParserRead();
}
else if (IsElement("imagespec"))
{
ImageSpec s = new ImageSpec(this);
rt.SetImageSpec(s);
ParserRead();
}
else if (IsElement("rtspec"))
{
rt.Parse(this);
ParserRead();
}
else if (IsElement("material"))
{
RTMaterial m = new RTMaterial(this);
scene.AddMaterial(m);
ParserRead();
}
else if (IsElement("light"))
{
RTLight l = new RTLight(this);
scene.AddLight(l);
ParserRead();
}
else if (IsElement("texture"))
{
RTTexture t = new RTTexture(this);
scene.AddTexture(t);
ParserRead();
}
else
{
ParserError("Main Parser:");
}
}
else
{
ParserRead();
}
}
mParser.Close();
if (!mHasError)
{
mStatusArea.Text = "Parsing Completed!";
}
}
public CommandFileParser(String cmdFile, ContentManager meshLoader, System.Windows.Forms.TextBox statusArea, RTCore rt, SceneDatabase scene)
{
mStatusArea = statusArea;
mFullPath = System.IO.Path.GetFullPath(System.IO.Path.GetDirectoryName(cmdFile));
mParser = new XmlTextReader(cmdFile);
mParser.WhitespaceHandling = WhitespaceHandling.None;
ParserRead();
while (!IsEndElement("RayTracer_552"))
{
if (IsElement() && (!IsElement("RayTracer_552")) )
{
if (IsElement("camera"))
{
RTCamera c = new RTCamera(this);
rt.SetCamera(c);
ParserRead();
}
else if (IsElement("sphere"))
{
RTSphere s = new RTSphere(this);
scene.AddGeom(s);
ParserRead();
}
else if (IsElement("rectangle"))
{
RTRectangle r = new RTRectangle(this);
scene.AddGeom(r);
ParserRead();
}
else if (IsElement("triangle"))
{
RTTriangle t = new RTTriangle(this);
scene.AddGeom(t);
ParserRead();
}
else if (IsElement("mesh"))
{
RTTriangle.ParseMeshForTriangles(this, meshLoader, scene);
ParserRead();
}
else if (IsElement("imagespec"))
{
ImageSpec s = new ImageSpec(this);
rt.SetImageSpec(s);
ParserRead();
}
else if (IsElement("rtspec"))
{
rt.Parse(this);
ParserRead();
}
else if (IsElement("material"))
{
RTMaterial m = new RTMaterial(this);
scene.AddMaterial(m);
ParserRead();
}
else if (IsElement("light"))
{
RTLight l = new RTLight(this);
scene.AddLight(l);
ParserRead();
}
else if (IsElement("texture"))
{
RTTexture t = new RTTexture(this);
scene.AddTexture(t);
ParserRead();
}
else
ParserError("Main Parser:");
}
else
ParserRead();
}
mParser.Close();
if (!mHasError)
mStatusArea.Text = "Parsing Completed!";
}
/// <summary>
/// Lights: can be access as an array, the collection is a simple array
/// </summary>
/// <param name="l"></param>
public void AddLight(RTLight l)
{
l.SetResourceIndex(mAllLights.Count);
mAllLights.AddResource(l);
}
/// <summary>
///
/// </summary>
private Vector3 ComputeShading(IntersectionRecord rec, int generation)
{
if (rec.GeomIndex == RTCore.kInvalidIndex)
{
return(mBgColor);
}
Vector3 resultColor = Vector3.Zero;
Vector3 V = -Vector3.Normalize(rec.RayDirection);
RTMaterial m = mSceneDatabase.GetMaterial(rec.MaterialIndex);
Vector3 useNormal = m.GetNormal(mSceneDatabase, rec);
for (int l = 0; l < mSceneDatabase.GetNumLights(); l++)
{
RTLight lgt = mSceneDatabase.GetLight(l);
resultColor += ShadeRec(V, lgt, rec);
}
resultColor += mSceneDatabase.GetMaterial(rec.MaterialIndex).GetAmbient(mSceneDatabase, rec);
int nextGen = generation + 1;
// now take care of reflection
float reflectivity = m.GetReflectivity(mSceneDatabase, rec);
Vector3 reflColor = Vector3.Zero;
if (mComputeReflection && (reflectivity > 0f) && (generation < mGeneration))
{
IntersectionRecord refRec = new IntersectionRecord();
Vector3 refDir = Vector3.Reflect(rec.RayDirection, useNormal);
Ray refRay = Ray.CrateRayFromPtDir(rec.IntersectPosition, refDir);
// Now compute new visibility
ComputeVisibility(refRay, refRec, rec.GeomIndex);
if (refRec.GeomIndex != RTCore.kInvalidIndex)
{
reflColor = ComputeShading(refRec, nextGen) * reflectivity;
}
else
{
reflColor = mBgColor * reflectivity;
}
}
// now do transparency
//
// The following code:
// 1. only supports refractive index > 1 (from less dense e.g.: air, to more dense: e.g., glass)
// 2. cannot go from dense material into less dense material (once enter cannot exit)
// 3. once entered: do not know how to go from one transparent object into another transparent object
//
float transparency = m.GetTransparency(mSceneDatabase, rec);
Vector3 transColor = Vector3.Zero;
if (mComputeReflection && (transparency > 0f) && (generation < mGeneration))
{
float cosThetaI = Vector3.Dot(V, useNormal);
float invN = 1f / m.GetRefractiveIndex;
float cosThetaT = (float)Math.Sqrt(1 - ((invN * invN) * (1 - (cosThetaI * cosThetaI))));
Vector3 transDir = -((invN * V) + ((cosThetaT - (invN * cosThetaI)) * useNormal));
Ray transRay = Ray.CrateRayFromPtDir(rec.IntersectPosition, transDir);
// Now compute new visibility
IntersectionRecord transRec = new IntersectionRecord();
ComputeVisibility(transRay, transRec, rec.GeomIndex); // here we assume single layer geometries
if (transRec.GeomIndex != RTCore.kInvalidIndex)
{
transColor = ComputeShading(transRec, nextGen) * transparency;
}
else
{
transColor = mBgColor * transparency;
}
}
resultColor = (1 - transparency - reflectivity) * resultColor + transColor + reflColor;
return(resultColor);
}
