/// <summary>
///
/// </summary>
/// <param name="o2w"></param>
/// <param name="w2o"></param>
/// <param name="ro"></param>
public IShape (Transform o2w, Transform w2o, bool ro)
{
this.ObjectToWorld = new Transform (o2w);
this.WorldToObject = new Transform (w2o);
this.ReverseOrientation = ro;
this.ShapeID = NextShapeID++;
}
/// <summary>
///
/// </summary>
/// <param name="o2w"></param>
/// <param name="w2o"></param>
/// <param name="ro"></param>
/// <param name="height"></param>
/// <param name="radius"></param>
/// <param name="innerRadius"></param>
/// <param name="phiMax"></param>
public Disk(Transform o2w, Transform w2o, bool ro, double height, double radius, double innerRadius, double phiMax)
: base(o2w, w2o, ro)
{
this.height = height;
this.radius = radius;
this.innerRadius = innerRadius;
this.phiMax = phiMax;
}
/// <summary> /// /// </summary> /// <param name="dg"></param> /// <param name="objectToWorld"></param> /// <returns></returns> public abstract BSSRDF GetBSSRDF (DifferentialGeometry dg, Transform objectToWorld);
/// <summary> /// /// </summary> /// <param name="dg"></param> /// <param name="objectToWorld"></param> /// <returns></returns> public abstract Task<BSDF> GetBSDFAsync (DifferentialGeometry dg, Transform objectToWorld);
/// <summary>
///
/// </summary>
/// <param name="l2w"></param>
/// <param name="ns"></param>
protected ILight(Transform l2w, int ns = 1)
{
this.NumberOfSamples = ns;
this.LightToWorld = new Transform (l2w);
this.WorldToLight = new Transform (l2w.Inverse);
}
/// <summary>
///
/// </summary>
/// <param name="transform"></param>
public Transform(Transform transform)
: this(transform.Matrix, transform.InverseMatrix)
{
}
public override bool Intersect(Ray r, out double tHit, out double rayEpsilon, DifferentialGeometry dg)
{
tHit = 0.0;
rayEpsilon = 0.0;
var ray = new Ray ();
this.WorldToObject.Apply (r, ref ray);
if (Math.Abs (ray.Direction.z) < 1e-7) return false;
var thit = (height - ray.Origin.z) / ray.Direction.z;
if (thit < ray.MinT || thit > ray.MaxT)
return false;
var phit = ray.Apply (thit);
var dist2 = phit.x * phit.x + phit.y * phit.y;
if (dist2 > radius * radius || dist2 < innerRadius * innerRadius)
return false;
var phi = Math.Atan2 (phit.y, phit.x);
if (phi < 0) phi += 2.0 * Math.PI;
if (phi > phiMax)
return false;
var u = phi / phiMax;
var oneMinusV = ((Math.Sqrt (dist2) - innerRadius) /
(radius - innerRadius));
var invOneMinusV = (oneMinusV > 0.0) ? (1.0 / oneMinusV) : 0.0;
var v = 1.0 - oneMinusV;
var dpdu = new Vector (-phiMax * phit.y, phiMax * phit.x, 0.0);
var dpdv = new Vector (-phit.x * invOneMinusV, -phit.y * invOneMinusV, 0.0);
dpdu *= phiMax * Util.InvTwoPI;
dpdv *= (radius - innerRadius) / radius;
var dndu = new Normal (0, 0, 0);
var dndv = new Normal (0, 0, 0);
var o2w = new Transform (this.ObjectToWorld);
dg = new DifferentialGeometry (o2w.Apply (phit), null, null, o2w.Apply (dndu), o2w.Apply (dndv), u, v, this);
tHit = thit;
rayEpsilon = 5e-4 * tHit;
return true;
}
public static IShape CreateDiskShape(Transform o2w, Transform w2o, bool reverseOrientation, ParameterSet parameters)
{
var height = parameters.FindOneDouble ("height", 0.0);
var radius = parameters.FindOneDouble ("radius", 1.0);
var innerRadius = parameters.FindOneDouble ("innerradius", 0.0);
var phimax = parameters.FindOneDouble ("phimax", 360.0);
return new Disk (o2w, w2o, reverseOrientation, height, radius, innerRadius, phimax);
}
/// <summary>
///
/// </summary>
/// <param name="name"></param>
/// <param name="objectToWorld"></param>
/// <param name="worldToObject"></param>
/// <param name="reverseOrientation"></param>
/// <param name="parameters"></param>
/// <param name="floatTextures"></param>
/// <param name="spectrumTextures"></param>
/// <returns></returns>
public static IShape CreateShape(string name, Transform objectToWorld, Transform worldToObject, bool reverseOrientation, ParameterSet parameters, Dictionary<string, ITexture<double>> floatTextures, Dictionary<string, ITexture<Spectrum>> spectrumTextures)
{
var plugin = new ShapePlugin (name);
return plugin.CreateShape (objectToWorld, worldToObject, reverseOrientation, parameters, floatTextures, spectrumTextures);
}
