[Bf-blender-cvs] [f9784ea6afa] master: Py NodeShader wrapper helper: add support for new Alpha setting of Principled BSDF.

[Bastien Montagne]

Commit: f9784ea6afa70d4105901af5c00e6da09e6f7f98
Author: Bastien Montagne
Date:   Wed May 15 20:58:18 2019 +0200
Branches: master
https://developer.blender.org/rBf9784ea6afa70d4105901af5c00e6da09e6f7f98

Py NodeShader wrapper helper: add support for new Alpha setting of Principled BSDF.

Now that we have real alpha in BSDF, it's much better option for
transparency, than previously used Transmission value.

Related to T64609.

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

M	release/scripts/modules/bpy_extras/node_shader_utils.py

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

diff --git a/release/scripts/modules/bpy_extras/node_shader_utils.py b/release/scripts/modules/bpy_extras/node_shader_utils.py
index 9a3900bd58b..390feba6ae4 100644
--- a/release/scripts/modules/bpy_extras/node_shader_utils.py
+++ b/release/scripts/modules/bpy_extras/node_shader_utils.py
@@ -446,8 +446,32 @@ class PrincipledBSDFWrapper(ShaderWrapper):
     transmission_texture = property(transmission_texture_get)
 
 
-    # TODO: Do we need more complex handling for alpha (allowing masking and such)?
-    #       Would need extra mixing nodes onto Base Color maybe, or even its own shading chain...
+    def alpha_get(self):
+        if not self.use_nodes or self.node_principled_bsdf is None:
+            return 1.0
+        return self.node_principled_bsdf.inputs["Alpha"].default_value
+
+    @_set_check
+    def alpha_set(self, value):
+        if self.use_nodes and self.node_principled_bsdf is not None:
+            self.node_principled_bsdf.inputs["Alpha"].default_value = value
+
+    alpha = property(alpha_get, alpha_set)
+
+
+    # Will only be used as gray-scale one...
+    def alpha_texture_get(self):
+        if not self.use_nodes or self.node_principled_bsdf is None:
+            return None
+        return ShaderImageTextureWrapper(
+            self, self.node_principled_bsdf,
+            self.node_principled_bsdf.inputs["Alpha"],
+            grid_row_diff=-1,
+        )
+
+    alpha_texture = property(alpha_texture_get)
+
+
 
     # --------------------------------------------------------------------
     # Normal map.