added micro-flake example renderings

src/phase/isotropic.cpp

@@ -23,6 +23,12 @@ MTS_NAMESPACE_BEGIN
 
 /*!\plugin{isotropic}{Isotropic phase function}
  * \order{1}
+ 
+ * \renderings{
+ *     \rendering{Isotropic}{phase_isotropic}
+ *     \rendering{Anisotropic}{phase_microflakes_005}
+ * }
+ *
  *
  * This phase function simulates completely uniform scattering,
  * where all directionality is lost after a single scattering 

src/phase/microflake.cpp

@@ -42,6 +42,12 @@ static StatsCounter avgSampleIterations("Micro-flake model",
  *       specifies the roughness of the fibers in the medium. 
  *     }
  * }
+ *
+ * \renderings{
+ *     \rendering{\code{stddev}=0.2}{phase_microflakes_02}
+ *     \rendering{\code{stddev}=0.05}{phase_microflakes_005}
+ * }
+ *
  * This plugin implements the anisotropic micro-flake phase function 
  * described in
  * ``A radiative transfer framework for rendering materials with