a few bugfixes

src/bsdfs/hk.cpp

@@ -43,8 +43,8 @@ MTS_NAMESPACE_BEGIN
  * }
  *
  * \renderings{
- *     \rendering{$\sigma_s=2$, $\sigma_a=0.1$, thickness$=0.1$}{bsdf_hk_1}
- *     \rendering{\code{ketchup} material preset}{bsdf_hk_2}
+ *     \rendering{An index-matched scattering layer with parameters $\sigma_s=2$, $\sigma_a=0.1$, thickness$=0.1$}{bsdf_hk_1}
+ *     \rendering{Example of the HK model with a dielectric coating (and the \code{ketchup} material preset, see \lstref{hk-coated})}{bsdf_hk_2}
  * }
  *
  * This plugin provides an implementation of the Hanrahan-Krueger BSDF
@@ -60,8 +60,8 @@ MTS_NAMESPACE_BEGIN
  * \begin{xml}
  * <bsdf type="hk">
  *     <spectrum name="sigmaS" value="2"/>
- *     <spectrum name="sigmaA" value="0.05"/>
- *     <float name="thickness" value="1"/>
+ *     <spectrum name="sigmaA" value="0.1"/>
+ *     <float name="thickness" value="0.1"/>
  *
  *     <phase type="hg">
  *         <float name="g" value="0.8"/>
@@ -74,19 +74,14 @@ MTS_NAMESPACE_BEGIN
  * of refraction are mismatched. The combination of these two plugins
  * reproduces the full model proposed in \cite{Hanrahan1993Reflection}.
  *
- * \begin{xml}
+ * \begin{xml}[caption=A thin dielectric layer with measured ketchup scattering parameters, label=lst:hk-coated]
  * <bsdf type="coating">
  *     <float name="extIOR" value="1.0"/>
  *     <float name="intIOR" value="1.5"/>
  *
  *     <bsdf type="hk">
- *         <spectrum name="sigmaS" value="2"/>
- *         <spectrum name="sigmaA" value="0.05"/>
- *         <float name="thickness" value="1"/>
- *
- *         <phase type="hg">
- *             <float name="g" value="0.8"/>
- *         </phase>
+ *         <string name="material" value="ketchup"/>
+ *         <float name="thickness" value="0.01"/>
  *     </bsdf>
  * </bsdf>
  * \end{xml}

src/integrators/path/volpath_simple.cpp

@@ -275,8 +275,6 @@ public:
 	}
 
 	MTS_DECLARE_CLASS()
-private:
-	bool m_strictNormals;
 };
 
 MTS_IMPLEMENT_CLASS_S(SimpleVolumetricPathTracer, false, MonteCarloIntegrator)

src/librender/medium.cpp

@@ -54,6 +54,7 @@ void Medium::configure() {
 	if (m_phaseFunction == NULL) {
 		m_phaseFunction = static_cast<PhaseFunction *> (PluginManager::getInstance()->
 				createObject(MTS_CLASS(PhaseFunction), Properties("isotropic")));
+		m_phaseFunction->configure();
 	}
 }
 

src/librender/phase.cpp

@@ -27,7 +27,7 @@ Float PhaseFunction::sigmaDir(Float cosTheta) const {
 		" an anisotropic medium)");
 	return 0.0f;
 }
-	
+
 Float PhaseFunction::sigmaDirMax() const {
 	Log(EError, "sigmaDirMax(): Not implemented! (this is not"
 		" an anisotropic medium)");

src/luminaires/envmap.cpp

@@ -110,7 +110,7 @@ public:
 	}
 
 	void configure() {
-		int mipMapLevel = std::min(3, m_mipmap->getLevels()-1);
+		int mipMapLevel = std::min(0, m_mipmap->getLevels()-1);
 		m_pdfResolution = m_mipmap->getLevelResolution(mipMapLevel);
 		m_pdfInvResolution = Vector2(1.0f / m_pdfResolution.x, 
 				1.0f / m_pdfResolution.y);

src/luminaires/sky.cpp

@@ -57,7 +57,7 @@ MTS_NAMESPACE_BEGIN
  *     \parameter{resolution}{\Integer}{Specifies the resolution of the precomputed
  *         image that is used to represent the sky environment map
  *         \default{256}}
- *     \parameter{intensityScale}{\Float}{
+ *     \parameter{skyScale}{\Float}{
  *         This parameter can be used to scale the the amount of illumination
  *         emitted by the sky luminaire, for instance to change its units. To
  *         switch from photometric ($\nicefrac{W}{m^2\cdot sr}$) 
@@ -164,7 +164,7 @@ class SkyLuminaire : public Luminaire {
 public:
 	SkyLuminaire(const Properties &props)
 			: Luminaire(props) {
-		m_intensityScale = props.getFloat("intensityScale", 1.0f);
+		m_scale = props.getFloat("skyScale", 1.0f);
 		m_turbidity = props.getFloat("turbidity", 3.0f);
 		if (m_turbidity < 1 || m_turbidity > 30)
 			Log(EError, "The turbidity parameter must be in the range [1,30]!");
@@ -182,7 +182,7 @@ public:
 
 	SkyLuminaire(Stream *stream, InstanceManager *manager) 
 		    : Luminaire(stream, manager) {
-		m_intensityScale = stream->readFloat();
+		m_scale = stream->readFloat();
 		m_turbidity = stream->readFloat();
 		m_thetaS = stream->readFloat();
 		m_phiS = stream->readFloat();
@@ -194,7 +194,7 @@ public:
 
 	void serialize(Stream *stream, InstanceManager *manager) const {
 		Luminaire::serialize(stream, manager);
-		stream->writeFloat(m_intensityScale);
+		stream->writeFloat(m_scale);
 		stream->writeFloat(m_turbidity);
 		stream->writeFloat(m_thetaS);
 		stream->writeFloat(m_phiS);
@@ -265,7 +265,7 @@ public:
 			Float theta = (i+.5f)*factor.x;
 			for (int j=0; j<phiBins; ++j) {
 				Float phi = (j+.5f)*factor.y;
-				Spectrum s = getSkySpectralRadiance(theta, phi) * m_intensityScale;
+				Spectrum s = getSkySpectralRadiance(theta, phi) * m_scale;
 				Float r, g, b;
 				s.toLinearRGB(r, g, b);
 				*target++ = r; *target++ = g;
@@ -290,7 +290,7 @@ public:
 
 	Spectrum Le(const Ray &ray) const {
 		Point2 coords = fromSphere(ray.d);
-		return getSkySpectralRadiance(coords.x, coords.y) * m_intensityScale;
+		return getSkySpectralRadiance(coords.x, coords.y) * m_scale;
 	}
 
 	std::string toString() const {
@@ -299,7 +299,7 @@ public:
 			<< "  turbidity = " << m_turbidity << "," << endl 
 			<< "  sunPos = [theta: " << m_thetaS << ", phi: "<< m_phiS << "]," << endl 
 			<< "  zenithL = " << m_zenithL << "," << endl
-			<< "  intensityScale = " << m_intensityScale << endl
+			<< "  skyScale = " << m_scale << endl
 			<< "]";
 		return oss.str();
 	}
@@ -385,7 +385,7 @@ protected:
 	/* Environment map resolution */
 	int m_resolution;
 	/* Constant scale factor applied to the model */
-	Float m_intensityScale;
+	Float m_scale;
 	/* The turbidity of the sky ranges normally from 1 to 30.
 	   For clear skies values in range [2,6] are useful. */
 	Float m_turbidity;

src/luminaires/sunsky.cpp

@@ -58,12 +58,13 @@ MTS_NAMESPACE_BEGIN
  *     \parameter{resolution}{\Integer}{Specifies the resolution of the precomputed
  *         image that is used to represent the sky environment map
  *         \default{256}}
- *     \parameter{scale}{\Float}{
+ *     \parameter{skyScale}{\Float}{
  *         This parameter can be used to scale the the amount of illumination
- *         emitted by the sky luminaire, for instance to change its units. To
- *         switch from photometric ($\nicefrac{W}{m^2\cdot sr}$) 
- *         to arbitrary but convenient units in the $[0,1]$ range, set 
- *         this parameter to \code{1e-5}.\default{1}.
+ *         emitted by the sky. 
+ *     }
+ *     \parameter{sunScale}{\Float}{
+ *         This parameter can be used to scale the the amount of illumination
+ *         emitted by the sun. 
  *     }
  * }
  *

src/medium/heterogeneous.cpp

@@ -86,6 +86,7 @@ public:
 	HeterogeneousMedium(const Properties &props) 
 		: Medium(props) {
 		m_stepSize = props.getFloat("stepSize", 0);
+		m_densityMultiplier = props.getFloat("densityMultiplier", 1);
 		if (props.hasProperty("sigmaS") || props.hasProperty("sigmaA"))
 			Log(EError, "The 'sigmaS' and 'sigmaA' properties are only supported by "
 				"homogeneous media. Please use nested volume instances to supply "