[Bf-extensions-cvs] [9bb36cd] master: Node Wrangler: Viewer node now compensates for film/CM exposure to avoid misleading the user

[Greg]

Commit: 9bb36cdc52284aba5f056716aebdb373330ec9dc
Author: Greg
Date:   Tue Aug 9 11:35:29 2016 +0200
Branches: master
https://developer.blender.org/rBA9bb36cdc52284aba5f056716aebdb373330ec9dc

Node Wrangler: Viewer node now compensates for film/CM exposure to avoid misleading the user

===================================================================

M	node_wrangler.py

===================================================================

diff --git a/node_wrangler.py b/node_wrangler.py
index 36fa9e8..d289bc1 100644
--- a/node_wrangler.py
+++ b/node_wrangler.py
@@ -1620,6 +1620,12 @@ class NWEmissionViewer(Operator, NWBase):
                             emission = emission_placeholder
                         make_links.append((active.outputs[out_i], emission.inputs[0]))
                         make_links.append((emission.outputs[0], materialout.inputs[0]))
+
+                        # Set brightness of viewer to compensate for Film and CM exposure
+                        intensity = 1/context.scene.cycles.film_exposure  # Film exposure is a multiplier
+                        intensity /= pow(2, (context.scene.view_settings.exposure))  # CM exposure is measured in stops/EVs (2^x)
+                        emission.inputs[1].default_value = intensity
+
                     else:
                         # Output type is 'SHADER', no Viewer needed. Delete Viewer if exists.
                         make_links.append((active.outputs[out_i], materialout.inputs[1 if active.outputs[out_i].name == "Volume" else 0]))