protected BaseProceduralTexture(int w, int h)
{
this.width = w;
this.height = h;
DUDV = new UV(
1f/Width,
1f/Height);
}
/* \brief Illuminates a given point in the scene.
*
* Given a point and two random samples (e.g., for position on area lights),
* this method returns direction from point to light, distance,
* pdf of having chosen this direction (e.g., 1 / area).
* Optionally also returns pdf of emitting particle in this direction,
* and cosine from lights normal (helps with PDF of hitting the light,
* but set to 1 for point lights).
*
* Returns radiance.
*/
public abstract RgbSpectrum Illuminate(
ref SceneSphere aSceneSphere,
ref Vector aReceivingPosition,
ref UV aRndTuple,
out Vector oDirectionToLight,
out float oDistance,
out float oDirectPdfW,
out float oEmissionPdfW,
out float oCosAtLight);
/* \brief Emits particle from the light.
*
* Given two sets of random numbers (e.g., position and direction on area light),
* this method generates a position and direction for light particle, along
* with the pdf.
*
* Can also supply pdf (w.r.t. area) of choosing this position when calling
* Illuminate. Also provides cosine on the light (this is 1 for point lights etc.).
*
* Returns "energy" that particle carries
*/
public abstract RgbSpectrum Emit(
ref SceneSphere aSceneSphere,
ref UV aDirRndTuple,
ref UV aPosRndTuple,
out Vector oPosition,
out Vector oDirection,
out float oEmissionPdfW,
out float oDirectPdfA,
out float oCosThetaLight);
public RgbSpectrum Le(Vector dir)
{
float theta = Vector.SphericalTheta(ref dir);
UV uv = new UV(Vector.SphericalPhi(ref dir) * MathLab.INVTWOPI + shiftU,
theta * MathLab.INVPI + shiftV);
return (RgbSpectrum) (gain
//* SkyLight;
* tex.Sample(uv.U, uv.V));
}
protected BaseBxdf(ref RayHit rh, ref RayData ray, ref Normal ng, ref Normal ns, ref UV texCoord,
MaterialInfo mi, SurfaceTextureInfo texData, bool fromLight)
{
#if VERBOSE
if (ng.Length > 1f || ns.Length > 1f)
{
Console.WriteLine("Normals in bsdf arent normalized");
}
#endif
this.Init(ref rh, ref ray, ref ng, ref ns, ref texCoord, mi, texData, fromLight);
}
public void InterpolateTriUV(int currentTriangleIndex, float b1, float b2, out UV texCoord)
{
var triIndex = currentTriangleIndex;
if (texCoords == null || texCoords.Count == 0)
texCoord = new UV { U = b1, V = b2 };
else
{
var t0 = texCoords[triIndex][0];
var t1 = texCoords[triIndex][1];
var t2 = texCoords[triIndex][2];
float b0 = 1f - b1 - b2;
// return t0 * b1 + t1 * b2 + t2 * b0;
texCoord = new UV(t0.U*b0 + t1.U*b1 + t2.U*b2, t0.V*b0 + t1.V*b1 + t2.V*b2);
}
}
public void InterpolateTriUV(int currentTriangleIndex, float b1, float b2, out UV texCoord)
{
var texCoords = scene.GeoData.TexCoords;
if (scene.GeoData.TexCoords == null
||
scene.Triangles[currentTriangleIndex].v0.TexCoordIndex < 0
||
texCoords.Length < scene.Triangles[currentTriangleIndex].v0.TexCoordIndex)
{
texCoord = new UV { U = b1, V = b2 };
}
else
{
var t0 = texCoords[scene.Triangles[currentTriangleIndex].v0.TexCoordIndex];
var t1 = texCoords[scene.Triangles[currentTriangleIndex].v1.TexCoordIndex];
var t2 = texCoords[scene.Triangles[currentTriangleIndex].v2.TexCoordIndex];
float b0 = 1f - b1 - b2;
// return t0 * b1 + t1 * b2 + t2 * b0;
texCoord = new UV(t0.x * b0 + t1.x * b1 + t2.x * b2, t0.y * b0 + t1.y * b1 + t2.y * b2);
}
}
internal void Init(ref RayHit rh, ref RayData ray, ref Normal ng, ref Normal ns, ref UV texCoord,
MaterialInfo mi, SurfaceTextureInfo texData, bool fromLight)
{
if (rh.Miss())
{
throw new ArgumentException("RayHit missed geometry!");
}
//if (HitPoint == null)
//{
HitPoint = new HitPointInfo
{
Color = RgbSpectrum.Max(ref mi.Kd, ref mi.Ks),
HitPoint = ray.Point(rh.Distance),
TexCoord = texCoord,
FromDirection = -ray.Dir,
GeoNormal = ng,
ShadingNormal = ns,
FromLight = fromLight
};
//}
//else
//{
// HitPoint.HitPoint = ray.Point(rh.Distance);
// HitPoint.TexCoord = texCoord;
// HitPoint.FromDirection = -ray.Dir;
// HitPoint.GeoNormal = ng;
// HitPoint.ShadingNormal = ns;
// HitPoint.FromLight = fromLight;
//};
this.MaterialInfo = mi;
this.TexData = texData;
if (Frame == null)
this.Frame = new ONB(ref HitPoint.GeoNormal);
else
Frame.SetFromZ(ref HitPoint.GeoNormal);
}
public void InterpolateTriUV(int currentTriangleIndex, float b1, float b2, out UV texCoord)
{
var texCoords = TexCoords;
if (TexCoords == null || Triangles[currentTriangleIndex].v0.TexCoordIndex < 0)
texCoord = new UV { U = b1, V = b2 };
else
{
var t0 = texCoords[Triangles[currentTriangleIndex].v0.TexCoordIndex];
var t1 = texCoords[Triangles[currentTriangleIndex].v1.TexCoordIndex];
var t2 = texCoords[Triangles[currentTriangleIndex].v2.TexCoordIndex];
float b0 = 1f - b1 - b2;
// return t0 * b1 + t1 * b2 + t2 * b0;
texCoord = new UV(t0.x * b0 + t1.x * b1 + t2.x * b2, t0.y * b0 + t1.y * b1 + t2.y * b2);
}
}
public MatteLambertBrdf(ref RayHit rh, ref RayData ray, ref Normal ng, ref Normal ns, ref UV texCoord, MaterialInfo mi, SurfaceTextureInfo texData, bool fromLight)
: base(ref rh, ref ray, ref ng, ref ns, ref texCoord, mi, texData, fromLight)
{
}
public override RgbSpectrum Illuminate(
ref SceneSphere aSceneSphere,
ref Vector aReceivingPosition,
ref UV aRndTuple,
out Vector oDirectionToLight,
out float oDistance,
out float oDirectPdfW,
out float oEmissionPdfW,
out float oCosAtLight)
{
UV uv = new UV();
MC.UniformSampleTriangle(aRndTuple.U, aRndTuple.V, ref uv.U, ref uv.V);
Vector lightPoint = p0 + e1*uv.U + e2*uv.V;
oDirectionToLight = lightPoint - aReceivingPosition;
float distSqr = oDirectionToLight.Length;
oDistance = MathLab.Sqrt(distSqr);
oDirectionToLight = oDirectionToLight/oDistance;
var invDir = -oDirectionToLight;
var norm = mFrame.Normal();
float cosNormalDir = Vector.Dot(ref norm, ref invDir);
// too close to, or under, tangent
if (cosNormalDir < Consts.EPS_COSINE)
{
oCosAtLight = float.MinValue;
oDirectPdfW = 0f;
oEmissionPdfW = 0f;
return RgbSpectrum.ZeroSpectrum();
}
oDirectPdfW = mInvArea*distSqr/cosNormalDir;
oCosAtLight = cosNormalDir;
oEmissionPdfW = mInvArea*cosNormalDir*MathLab.INVPI;
return mIntensity;
}
public override RgbSpectrum Emit(ref SceneSphere aSceneSphere, ref UV aDirRndTuple, ref UV aPosRndTuple, out Vector oPosition, out Vector oDirection, out float oEmissionPdfW, out float oDirectPdfA, out float oCosThetaLight)
{
throw new NotImplementedException();
}
public override RgbSpectrum Illuminate(ref SceneSphere aSceneSphere, ref Vector aReceivingPosition, ref UV aRndTuple, out Vector oDirectionToLight, out float oDistance, out float oDirectPdfW, out float oEmissionPdfW, out float oCosAtLight)
{
throw new NotImplementedException();
}
public override RgbSpectrum Emit(
ref SceneSphere aSceneSphere,
ref UV aDirRndTuple,
ref UV aPosRndTuple,
out Vector oPosition,
out Vector oDirection,
out float oEmissionPdfW,
out float oDirectPdfA,
out float oCosThetaLight)
{
UV uv = new UV();
MC.UniformSampleTriangle(aPosRndTuple.U, aPosRndTuple.V, ref uv.U, ref uv.V);
oPosition = p0 + e1*uv.U + e2*uv.V;
Vector localDirOut = Utils.SampleCosHemisphereW(aDirRndTuple, out oEmissionPdfW);
oEmissionPdfW *= mInvArea;
// cannot really not emit the particle, so just bias it to the correct angle
localDirOut.z = Math.Max(localDirOut.z, Consts.EPS_COSINE);
oDirection = mFrame.ToWorld(ref localDirOut);
oDirectPdfA = mInvArea;
oCosThetaLight = localDirOut.z;
return mIntensity*localDirOut.z;
}
public SpecularReflectionBrdf(ref RayHit rh, ref RayData ray, ref Normal ng, ref Normal ns, ref UV texCoord, MaterialInfo mi, SurfaceTextureInfo texData, bool fromLight)
: base(ref rh, ref ray, ref ng, ref ns, ref texCoord, mi, texData, fromLight)
{
}
private void EvalIntersectionAdvanced(ref RayData PathRay, ref RayHit hit, ref SurfaceIntersectionData ii, IntersectionOptions options)
{
ITriangleMesh mesh = null;
#if VERBOSE
try
{
#endif
var currentTriangleIndex = (int)hit.Index;
bool isLight = scene.IsLight(currentTriangleIndex);
ii.Hit = hit;
ii.isLight = isLight;
mesh = scene.GetMeshByTriangleIndex(currentTriangleIndex);
if (mesh == null)
//|| mesh.MeshName.Equals("COL254_01", StringComparison.InvariantCultureIgnoreCase))
{
//ii.Color = new RgbSpectrum(1f);
//Debugger.Break();
throw new ApplicationException("Invalid triangle index " + currentTriangleIndex + " Mesh not found");
}
var meshMat = mesh.MaterialID;
ii.isVolume = scene.IsVolumeTriangle(currentTriangleIndex);
ii.MMaterial = scene.MatLib.GetSurfMat(meshMat);
var matInfo = scene.MaterialProvider.Get(meshMat);
mesh.InterpolateTriUV(currentTriangleIndex, hit.U, hit.V, out ii.TexCoords);
if (ii.isVolume)
{
var volumeMaterialInfo = vm.GetMaterialInfo(mesh.MaterialID);
vmSampler.Sample(volumeMaterialInfo, ii.Hit.Distance, ref PathRay, out ii.VolumeData);
//texSampler.SampleTexture(hit.U, hit.V, volumeMaterialInfo.Density, out ii.VolumeData.Density);
//this.texSampler.SampleTexture(hit.U, hit.V, new NoiseTexture() ii.VolumeData.Density);
//return;
}
mesh.InterpolateTriangleNormal((int)hit.Index, hit.U, hit.V, ref ii.Normal);
//ii.Normal = scene.Triangles[currentTriangleIndex].ComputeNormal(scene.Vertices).Normalize();
// ii.TexCoords = new UV(hit.U, hit.V);
if (isLight)
{
if (!options.Has(IntersectionOptions.ResumeOnLight))
return;
var color = scene.GetLightByIndex((int)hit.Index).Profile.Evaluate(hit.U, hit.V);
ii.Color = options.Has(IntersectionOptions.ResolveSpectralDistributions) ? ColorFactory.ToRgb(ref color) : (RgbSpectrum)(RgbSpectrumInfo)color;
}
if (options.Has(IntersectionOptions.ResolvePartialDerivatives))
{
var p1 = scene.Vertices[scene.Triangles[currentTriangleIndex].v0.VertexIndex];
var p2 = scene.Vertices[scene.Triangles[currentTriangleIndex].v1.VertexIndex];
var p3 = scene.Vertices[scene.Triangles[currentTriangleIndex].v2.VertexIndex];
var mt = scene.sceneData.GeoData.TexCoords;
var uv1 = mt[scene.sceneData.Triangles[currentTriangleIndex].v0.TexCoordIndex];
var uv2 = mt[scene.sceneData.Triangles[currentTriangleIndex].v1.TexCoordIndex];
var uv3 = mt[scene.sceneData.Triangles[currentTriangleIndex].v2.TexCoordIndex];
float du1 = uv1.x - uv3.x;
float du2 = uv2.x - uv3.x;
float dv1 = uv1.y - uv3.y;
float dv2 = uv2.y - uv3.y;
Vector dp1 = Vector.Sub(ref p1, ref p3), dp2 = Vector.Sub(ref p2, ref p3);
float determinant = du1 * dv2 - dv1 * du2;
if (determinant.NearEqual(0f))
{
// Handle zero determinant for triangle partial derivative matrix
Vector e1 = p2 - p1;
Vector e2 = p3 - p1;
Vector.CoordinateSystem(Vector.Normalize(Vector.Cross(ref e2, ref e1)), out ii.DpDu, out ii.DpDv);
}
else
{
float invdet = 1f / determinant;
ii.DpDu = (dv2 * dp1 - dv1 * dp2) * invdet;
ii.DpDv = (-du2 * dp1 + du1 * dp2) * invdet;
}
}
if (matInfo.Alpha is ConstTextureInfo)
{
ii.Alpha = (matInfo.Alpha as ConstTextureInfo).Color;
}
if (options.Has(IntersectionOptions.ResolveTextures))
{
var diffuseTex = scene.Query(meshMat, TextureType.Diffuse);
if (diffuseTex != null)
{
#if !TEXSAMP
RgbSpectrumInfo cc = diffuseTex.Sample(ii.TexCoords.U, ii.TexCoords.V);
#else
RgbSpectrumInfo cc;
texSampler.SampleTexture(ii.TexCoords.U, ii.TexCoords.V, diffuseTex, out cc);
#endif
ii.Color = new RgbSpectrum(cc.c1, cc.c2, cc.c3);
//ii.Color = diffuseTex.Sample(ii.TexCoords.U, ii.TexCoords.V);
//ii.Color = diffuseTex.Sample(hit.U, hit.V);
}
else
{
ii.Color = RgbSpectrum.Max(ref matInfo.Ks, ref matInfo.Kd);
}
var bump = new Vector(0f);
Vector v1, v2;
Normal geoNormal = ii.Normal;
Vector.CoordinateSystem(ref geoNormal, out v1, out v2);
var bumpTex = scene.Query(meshMat, TextureType.Bump);
if (bumpTex != null)
{
var map = bumpTex;
var dudv = map.DUDV;
RgbSpectrumInfo bs;
#if TEXSAMP
texSampler.SampleTexture(ii.TexCoords.U, ii.TexCoords.V, bumpTex, out bs);
#else
bs = bumpTex.Sample(ii.TexCoords.U, ii.TexCoords.V);
#endif
float b0 = bs.Filter();
UV uvdu = new UV(ii.TexCoords.U + dudv.U, ii.TexCoords.V);
#if TEXSAMP
texSampler.SampleTexture(uvdu.U, uvdu.V, bumpTex, out bs);
#else
bs = bumpTex.Sample(uvdu.U, uvdu.V);
#endif
float bu = bs.Filter();
UV uvdv = new UV(ii.TexCoords.U, ii.TexCoords.V + dudv.V);
#if TEXSAMP
texSampler.SampleTexture(uvdv.U, uvdv.V, bumpTex, out bs);
#else
bs = bumpTex.Sample(uvdv.U, uvdv.V);
#endif
float bv = bs.Filter();
float scale = 1.0f; //bm->GetScale();
bump = new Vector(scale * (bu - b0), scale * (bv - b0), 1f);
ii.Normal = new Normal(
v1.x * bump.x + v2.x * bump.y + geoNormal.x * bump.z,
v1.y * bump.x + v2.y * bump.y + geoNormal.y * bump.z,
v1.z * bump.x + v2.z * bump.y + geoNormal.z * bump.z).Normalize();
}
var nfScale = 2.0f;
var nfIscale = 0.5f;
var normTex = scene.Query(meshMat, TextureType.Normal);
if (normTex != null)
{
RgbSpectrumInfo color;
texSampler.SampleTexture(ii.TexCoords.U, ii.TexCoords.V, normTex, out color);
float x = nfScale * (color.c1 - nfIscale);
float y = nfScale * (color.c2 - nfIscale);
float z = nfScale * (color.c3 - nfIscale);
ii.Normal = new Normal(
v1.x * x + v2.x * y + geoNormal.x * z,
v1.y * x + v2.y * y + geoNormal.y * z,
v1.z * x + v2.z * y + geoNormal.z * z).Normalize();
}
RgbSpectrumInfo reflectance = matInfo.Coefficients[3];
//(RgbSpectrumInfo) matInfo.SpecularReflectance;
var reflTex = scene.Query(meshMat, TextureType.Reflection);
if (reflTex != null)
{
texSampler.SampleTexture(ii.TexCoords.U, ii.TexCoords.V, reflTex, out reflectance);
}
RgbSpectrumInfo alpha = null;
var alphaTex = scene.Query(meshMat, TextureType.Alpha);
if (alphaTex != null)
{
texSampler.SampleTexture(ii.TexCoords.U, ii.TexCoords.V, alphaTex, out alpha);
}
var zero = new RgbSpectrum(0f);
if (ii.TextureData == null)
{
ii.TextureData = new SurfaceTextureData()
{
T0 = 0.5f,
Transmittance = matInfo.Ks,
Exponent = matInfo.Exponent,
Alpha = alpha != null ? (RgbSpectrum) alpha : zero,
Diffuse = ii.Color,
Roughness = bump,
Bump = bump,
Medium = MediumInfo.Glass,
Specular = (RgbSpectrum) reflectance
};
}
else
{
ii.TextureData.T0 = 0.5f;
ii.TextureData.Transmittance = matInfo.Ks;
ii.TextureData.Exponent = matInfo.Exponent;
ii.TextureData.Alpha = alpha != null ? (RgbSpectrum) alpha : zero;
ii.TextureData.Diffuse = ii.Color;
ii.TextureData.Roughness = bump;
ii.TextureData.Bump = bump;
ii.TextureData.Medium = MediumInfo.Glass;
ii.TextureData.Specular = (RgbSpectrum) reflectance;
}
}
else
{
ii.Color =
//matInfo.Kd;
RgbSpectrum.Max(ref matInfo.Ks, ref matInfo.Kd);
ii.TextureData = new SurfaceTextureData()
{
T0 = 0.5f,
Transmittance = matInfo.Ks,
Exponent = matInfo.Exponent,
//Alpha = matInfo.Ka,
Diffuse = matInfo.Kd,
//Roughness = bump,
//Bump = bump,
Medium = MediumInfo.Glass,
Specular = matInfo.Ks
};
}
/*
if (mesh.MeshName.Equals("COL254_01", StringComparison.InvariantCultureIgnoreCase))
{
//ii.Color = new RgbSpectrum(1f);
ii.Normal = -scene.Triangles[currentTriangleIndex].ComputeNormal(scene.Vertices).Normalize();
//ii.ShadingNormal = ii.Normal;
}
*/
ii.ShadingNormal = (Normal.Dot(ref PathRay.Dir, ref ii.Normal) > 0f) ? -ii.Normal : ii.Normal;
if (options.Has(IntersectionOptions.ResolveSpectralDistributions))
{
ii.Reflectance = ColorFactory.FromRgb(RgbSpectrum.Max(ref ii.Color, ref matInfo.Kd), SpectrumType.Reflectance);
}
//ii.ShadingNormal = ii.Normal;
/*
ii.Material = new DistributionBsdf(ii.Color.y(), ii.Color,
new FresnelConductor(FresnelApproxEta(ref matInfo.Kd), FresnelApproxK(ref matInfo.Ks))
//new FresnelDielectric(1.5f, 1f)
//new FresnelNoOP()
);
new DistributionBsdf(bump.IsZero() ? ii.Color.Filter():bump.Avg(), ii.Color);
* */
//new DistributionBsdf(bump.IsZero() ? ii.Color.Filter() : bump.Avg(), ii.Color);
#if VERBOSE
}
catch (Exception ex)
{
RayDen.Library.Components.SystemComponents.Tracer.TraceLine("Surface sampling error");
RayDen.Library.Components.SystemComponents.Tracer.TraceLine(ex.Message);
RayDen.Library.Components.SystemComponents.Tracer.TraceLine(ex.StackTrace);
throw;
}
#endif
}