Some minor rewording improvements/clarifications

README.md

@@ -18,6 +18,12 @@ OpenPBR Surface is an open standard hosted by the [Academy Software Foundation](
 * **[Reference implementation](reference/open_pbr_surface.mtlx)** – written in [MaterialX](https://materialx.org/)
 * **[BibTeX citation](openpbr.bib)**
 
+### Resources
+
+* [MaterialX Web Viewer](https://academysoftwarefoundation.github.io/MaterialX/?file=Materials/Examples/OpenPbr/open_pbr_default.mtlx) - WebGL rasterization renderer using MaterialX [implementation](reference/open_pbr_surface.mtlx) of OpenPBR
+* [OpenPBR-viewer](https://github.com/portsmouth/OpenPBR-viewer) - self-contained example implementation in a WebGL pathtracer (run [here](https://portsmouth.github.io/OpenPBR-viewer))
+* [#openpbr](https://academysoftwarefdn.slack.com/channels/openpbr) - public Slack channel for discussions, hosted by ASWF
+
 <br/>
 
 [![License: CC BY-SA 4.0](https://img.shields.io/badge/License-Apache%202.0-informational.svg)](LICENSE)

examples/open_pbr_default.mtlx

@@ -20,7 +20,7 @@
     <input name="transmission_scatter" type="color3" value="0, 0, 0" />
     <input name="transmission_scatter_anisotropy" type="float" value="0.0" />
     <input name="transmission_dispersion_scale" type="float" value="0.0" />
-    <input name="transmission_dispersion_abbe_number" type="float" value="0.0" />
+    <input name="transmission_dispersion_abbe_number" type="float" value="20.0" />
     <input name="subsurface_weight" type="float" value="0" />
     <input name="subsurface_color" type="color3" value="0.8, 0.8, 0.8" />
     <input name="subsurface_radius" type="float" value="1.0" />
@@ -35,9 +35,9 @@
     <input name="coat_roughness_anisotropy" type="float" value="0.0" />
     <input name="coat_ior" type="float" value="1.6" />
     <input name="coat_darkening" type="float" value="1.0" />
-    <input name="thin_film_weight" type="float" value="0.0" />
-    <input name="thin_film_thickness" type="float" value="0" />
-    <input name="thin_film_ior" type="float" value="1.5" />
+    <input name="thin_film_weight" type="float" value="0" />
+    <input name="thin_film_thickness" type="float" value="0.5" />
+    <input name="thin_film_ior" type="float" value="1.4" />
     <input name="emission_luminance" type="float" value="0.0" />
     <input name="emission_color" type="color3" value="1, 1, 1" />
     <input name="geometry_opacity" type="float" value="1" />

examples/open_pbr_velvet.mtlx

@@ -8,6 +8,6 @@
     <input name="specular_roughness" type="float" value="0.8" />
     <input name="fuzz_weight" type="float" value="1" />
     <input name="fuzz_color" type="color3" value="0.4, 0.4, 0.4" />
-    <input name="fuzz_roughness" type="float" value="0.2" />
+    <input name="fuzz_roughness" type="float" value="0.5" />
   </open_pbr_surface>
 </materialx>