implemented getRoughness() for the remainder of BSDFs

src/bsdfs/blendbsdf.cpp

@@ -261,6 +261,12 @@ public:
 		}
 	}
 
+	Float getRoughness(const Intersection &its, int component) const {
+		int bsdfIndex = m_indices[component].first;
+		component = m_indices[component].second;
+		return m_bsdfs[bsdfIndex]->getRoughness(its, component);
+	}
+
 	void addChild(const std::string &name, ConfigurableObject *child) {
 		if (child->getClass()->derivesFrom(MTS_CLASS(BSDF))) {
 			BSDF *bsdf = static_cast<BSDF *>(child);

src/bsdfs/bump.cpp

@@ -230,6 +230,10 @@ public:
 		return result;
 	}
 
+	Float getRoughness(const Intersection &its, int component) const {
+		return m_nested->getRoughness(its, component);
+	}
+
 	std::string toString() const {
 		std::ostringstream oss;
 		oss << "BumpMap[" << endl

src/bsdfs/coating.cpp

@@ -379,6 +379,11 @@ public:
 		return SmoothCoating::sample(bRec, pdf, sample);
 	}
 
+	Float getRoughness(const Intersection &its, int component) const {
+		return component < (int) m_components.size()
+			? m_nested->getRoughness(its, component) : (Float) 0;
+	}
+
 	std::string toString() const {
 		std::ostringstream oss;
 		oss << "SmoothCoating[" << endl

src/bsdfs/hk.cpp

@@ -408,6 +408,12 @@ public:
 		}
 	}
 
+	Float getRoughness(const Intersection &its, int component) const {
+		/* For lack of a better value, treat this material as diffuse 
+		   in Manifold Exploration */
+		return std::numeric_limits<Float>::infinity();
+	}
+
 	std::string toString() const {
 		std::ostringstream oss;
 		oss << "HanrahanKrueger[" << endl

src/bsdfs/irawan.cpp

@@ -614,6 +614,12 @@ public:
 		return al / (4.0f * M_PI) * c1 * c2 / (c1 + c2);
 	}
 
+	Float getRoughness(const Intersection &its, int component) const {
+		/* For lack of a better value, treat this material as diffuse 
+		   in Manifold Exploration */
+		return std::numeric_limits<Float>::infinity();
+	}
+
 	std::string toString() const {
 		std::ostringstream oss;
 		oss << "IrawanClothBRDF[" << endl

src/bsdfs/roughcoating.cpp

@@ -437,6 +437,12 @@ public:
 		return RoughCoating::sample(bRec, pdf, sample);
 	}
 
+	Float getRoughness(const Intersection &its, int component) const {
+		return component < (int) m_components.size()
+			? m_nested->getRoughness(its, component)
+			: m_alpha->getAverage().average();
+	}
+
 	void addChild(const std::string &name, ConfigurableObject *child) {
 		if (child->getClass()->derivesFrom(MTS_CLASS(BSDF))) {
 			if (m_nested != NULL)