TSpectrum: added absolute value function

include/mitsuba/core/spectrum.h

@@ -485,6 +485,14 @@ public:
 		return result * (1.0f / N);
 	}
 
+	/// Component-wise absolute value
+	inline TSpectrum abs() const {
+		TSpectrum value;
+		for (int i=0; i<N; i++)
+			value.s[i] = std::abs(s[i]);
+		return value;
+	}
+
 	/// Component-wise square root
 	inline TSpectrum sqrt() const {
 		TSpectrum value;

src/libpython/core.cpp

@@ -1649,7 +1649,9 @@ void export_core() {
 		.def("isValid", &Color3::isValid)
 		.def("isNaN", &Color3::isNaN)
 		.def("average", &Color3::average)
+		.def("abs", &Color3::abs)
 		.def("sqrt", &Color3::sqrt)
+		.def("safe_sqrt", &Color3::safe_sqrt)
 		.def("exp", &Color3::exp)
 		.def("log", &Color3::log)
 		.def("pow", &Color3::pow)
@@ -1685,6 +1687,7 @@ void export_core() {
 		.def("isValid", &Spectrum::isValid)
 		.def("isNaN", &Spectrum::isNaN)
 		.def("average", &Spectrum::average)
+		.def("abs", &Spectrum::abs)
 		.def("sqrt", &Spectrum::sqrt)
 		.def("safe_sqrt", &Spectrum::safe_sqrt)
 		.def("exp", &Spectrum::exp)