public LightRay( Color3 RadiantIntensity, Ray GeneratedRay, Vector Normal, float Pdf )
{
this.RadiantIntensity = RadiantIntensity;
this.GeneratedRay = GeneratedRay;
this.Normal = Normal;
this.Pdf = Pdf;
}
protected override void Trace( Ray ModelRay, ref ShapeHitList Hits )
{
Vector oc = Center - ModelRay.Origin;
float l2oc = Vector.DotProduct( oc, oc );
float dp = Vector.DotProduct( ModelRay.Direction, ModelRay.Direction );
if ( l2oc <= RadiusSquared ) // Inside the sphere
{
float tca = Vector.DotProduct( oc, ModelRay.Direction );
float l2hc = ( RadiusSquared - l2oc ) / dp + tca * tca;
float t = tca + (float)Math.Sqrt( l2hc );
Hits.Add( t, SphereInsideFaceIndex );
}
else
{
float tca = Vector.DotProduct( oc, ModelRay.Direction ) / dp;
if ( tca >= 0.0f )
{
float l2hc = ( RadiusSquared - l2oc ) / dp + tca * tca;
float t = tca - (float)Math.Sqrt( l2hc );
if ( l2hc > 0.0f ) // Hits Sphere
{
Hits.Add( t, SphereOutsideFaceIndex );
}
}
}
}
internal override sealed void Trace( Ray ModelRay, ShapeHitCollection ShapeHits )
{
Debug.Assert( ShapeHits != null );
ShapeHitList Hits = new ShapeHitList( ShapeHits );
Trace( ModelRay, ref Hits );
}
internal void Trace( Ray WorldRay, ShapeHitCollection ShapeHits, SimpleGeometryHitCollection GeometryHits, List<ObjectHit> ObjectHits )
{
Debug.Assert( ShapeHits != null );
Debug.Assert( GeometryHits != null );
Debug.Assert( ObjectHits != null );
Trace( WorldRay, new GeometryTracer( ShapeHits, GeometryHits ), new ObjectHitCollection( ObjectHits ) );
}
public SimpleGeometryHit( Matrix ModelToWorld, Ray ModelRay )
{
Debug.Assert( ModelToWorld != null );
this.Type = GeometryType.Model;
this.ModelToWorld = ModelToWorld;
this.ModelRay = ModelRay;
}
public void Trace( SceneObjects Objects, Ray WorldRay )
{
if ( Objects == null )
{
throw new ArgumentNullException( "Objects" );
}
Objects.Trace( WorldRay, ShapeHits, GeometryHits, ObjectHits );
}
internal override sealed SimpleGeometryHit Trace( Ray WorldRay, ShapeHitCollection Hits, SimpleGeometryHitCollection GeometryHits )
{
Debug.Assert( Hits != null );
Debug.Assert( GeometryHits != null );
Hits.AdvanceBaseIndex();
Trace( WorldRay, Hits );
return ( Hits.Count == Hits.Base ) ? null : GeometryHits.Next();
}
internal override SimpleGeometryHit Trace( Ray WorldRay, ShapeHitCollection Hits, SimpleGeometryHitCollection GeometryHits )
{
Debug.Assert( Hits != null );
Debug.Assert( GeometryHits != null );
Hits.AdvanceBaseIndex();
Ray ModelRay = WorldToModel * WorldRay;
Shape.Trace( ModelRay, Hits );
return ( Hits.Count == Hits.Base ) ? null : GeometryHits.Next( ModelToWorld, ModelRay );
}
protected override Color3 ShadeHits( Ray WorldRay, IReadOnlyList<ObjectHit> Hits )
{
Color4 total = Color4.Transparent;
for ( int i = 0; i < Hits.Count && total.A != 1.0f; i++ )
{
ObjectHit hit = Hits[i];
IShadableObject Obj = hit.Object as IShadableObject;
if ( hit.Distance < Epsilon || Obj == null )
{
continue;
}
Color3 term = Color3.Black;
float alpha;
Point worldHit = WorldRay.Endpoint( hit.Distance );
Vector worldViewer = WorldRay.Direction;
Point modelHit = hit.ModelHit( worldHit );
Vector modelViewer = hit.ModelViewer( worldViewer );
Shaders Shades = Obj.Shaders( hit.FaceHit );
if ( Shades.Translucent != null )
{
alpha = Shades.Translucent.Alpha( worldHit, modelHit, hit.AdditionalData );
}
else
{
alpha = 1.0f;
}
if ( Shades.Emissive != null )
{
term = Shades.Emissive.Emissive( worldHit, modelHit, hit.AdditionalData );
}
if ( Shades.Indirect != null )
{
Normal.Set( Shades.Normal, worldHit, modelHit, hit.ModelToWorld, hit.AdditionalData );
term += Shades.Indirect.Indirect( worldHit, modelHit,
hit.AdditionalData,
worldViewer, modelViewer,
Normal, Rng, NextTracer );
}
Color4 termWithAlpha = new Color4( term, alpha );
total = Color4.Over( total, termWithAlpha );
}
return total.Reduce();
}
internal void Trace( Ray WorldRay, ShapeHitCollection ShapeHits, SimpleGeometryHitCollection GeometryHits, List<ObjectHit> ObjectHits )
{
Debug.Assert( ShapeHits != null );
Debug.Assert( GeometryHits != null );
Debug.Assert( ObjectHits != null );
ObjectHits.Clear();
GeometryHits.Clear();
ShapeHits.Clear();
SceneTracer Tracer = new SceneTracer( ShapeHits, GeometryHits, ObjectHits );
Trace( WorldRay, Tracer );
}
public SimpleGeometryHit Next( Matrix ModelToWorld, Ray ModelRay )
{
Debug.Assert( ModelToWorld != null );
if ( Count == Hits.Count )
{
Hits.Add( new SimpleGeometryHit( ModelToWorld, ModelRay ) );
return Hits[Count++];
}
Hits[Count].Set( ModelToWorld, ModelRay );
return Hits[Count++];
}
public IReadOnlyList<ObjectHit> Trace( SceneBase Scene, Ray WorldRay, bool SortHits )
{
if ( Scene == null )
{
throw new ArgumentNullException( "Scene" );
}
Scene.Trace( WorldRay, ShapeHits, GeometryHits, ObjectHits );
if ( SortHits )
{
ObjectHits.Sort();
}
return ObjectHits;
}
public bool Visible( Ray WorldRay, float DistanceToLight )
{
IReadOnlyList<ObjectHit> Hits = Tracer.Trace( Scene, WorldRay, false );
float DistanceToClosestObject = float.PositiveInfinity;
for ( int i = 0; i < Hits.Count && DistanceToLight < DistanceToClosestObject; i++ )
{
if ( Hits[i].Distance < Epsilon )
{
continue;
}
DistanceToClosestObject = Math.Min( Hits[i].Distance, DistanceToClosestObject );
}
return DistanceToLight < DistanceToClosestObject;
}
protected override void Trace( Ray ModelRay, ref ShapeHitList Hits )
{
float dp = Vector.DotProduct( ModelRay.Direction, Normal );
float distance = -Vector.DotProduct( ModelRay.Origin - P0, Normal ) / dp;
// If the distnace traveled is less than zero, misses the plane
if ( distance <= 0.0f )
{
return;
}
if ( dp > 0.0f ) // Hits front
{
Hits.Add( distance, PlaneFrontFaceIndex );
}
else // Hits back
{
Hits.Add( distance, PlaneBackFaceIndex );
}
}
public Color3 Trace( Ray WorldRay, float PreferredContinueProbability = 1.0f )
{
if ( DoRussianRouletteTermination )
{
PreferredContinueProbability = Math.Max( Math.Min( MaximumTerminationProbability, PreferredContinueProbability ), MinimumTerminationProbability );
if ( PreferredContinueProbability == 0.0f || PreferredContinueProbability < Rng.NextDouble() )
{
return Color3.Black;
}
}
WorldRay = new Ray( WorldRay.Origin, WorldRay.Direction.Normalize() );
IReadOnlyList<ObjectHit> Hits = Tracer.Trace( Scene, WorldRay, true );
if ( Hits.Count == 0 )
{
return Color3.Black;
}
return ( !DoRussianRouletteTermination ) ? ShadeHits( WorldRay, Hits ) : ShadeHits( WorldRay, Hits ) / PreferredContinueProbability;
}
protected abstract void Trace( Ray WorldRay, GeometryTracer Tracer, ObjectHitCollection ObjectHits );
public GeometryHitCollection Trace( GeometryBase Geometry, Ray WorldRay )
{
if ( Geometry == null )
{
throw new ArgumentNullException( "Geometry" );
}
SimpleGeometryHit GeomHit = Geometry.Trace( WorldRay, ShapeHits, GeometryHits );
return new GeometryHitCollection( ShapeHits, GeomHit );
}
internal abstract void Trace( Ray ModelRay, ShapeHitCollection ShapeHits );
internal abstract SimpleGeometryHit Trace( Ray WorldRay, ShapeHitCollection Hits, SimpleGeometryHitCollection GeometryHits );
protected abstract void Trace( Ray ModelRay, ref ShapeHitList Hits );
protected override void Trace( Ray WorldRay, GeometryTracer Tracer, ObjectHitCollection ObjectHits )
{
GeometryHitCollection GeometryHits = Tracer.Trace( Geometry, WorldRay );
for ( int i = 0; i < GeometryHits.Count; i++ )
{
ObjectHits.Add( CreateObjectHit( GeometryHits[i] ) );
}
}
protected override void Trace( Ray WorldRay, SceneTracer Tracer )
{
Tracer.Trace( Objects, WorldRay );
}
protected abstract void Trace( Ray WorldRay, SceneTracer Tracer );
protected abstract Color3 ShadeHits( Ray WorldRay, IReadOnlyList<ObjectHit> Hits );
internal void Trace( Ray WorldRay, ShapeHitCollection ShapeHits, SimpleGeometryHitCollection GeometryHits, List<ObjectHit> ObjectHits )
{
Debug.Assert( ShapeHits != null );
Debug.Assert( GeometryHits != null );
Debug.Assert( ObjectHits != null );
for ( int i = 0; i < Objects.Count; i++ )
{
Objects[i].Trace( WorldRay, ShapeHits, GeometryHits, ObjectHits );
}
}