[Bf-extensions-cvs] [787a1b8f] master: glTF importer: Fix alpha usage in unlit material

[Julien Duroure]

Commit: 787a1b8f1ea8926c587e36e37e3416d3fa6d0e63
Author: Julien Duroure
Date:   Fri Feb 1 19:22:32 2019 +0100
Branches: master
https://developer.blender.org/rBA787a1b8f1ea8926c587e36e37e3416d3fa6d0e63

glTF importer: Fix alpha usage in unlit material

Using emission node + is camera ray

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

M	io_scene_gltf2/blender/imp/gltf2_blender_pbrMetallicRoughness.py

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

diff --git a/io_scene_gltf2/blender/imp/gltf2_blender_pbrMetallicRoughness.py b/io_scene_gltf2/blender/imp/gltf2_blender_pbrMetallicRoughness.py
index cfa6b83c..72a75880 100755
--- a/io_scene_gltf2/blender/imp/gltf2_blender_pbrMetallicRoughness.py
+++ b/io_scene_gltf2/blender/imp/gltf2_blender_pbrMetallicRoughness.py
@@ -55,8 +55,8 @@ class BlenderPbr():
             main_node = node_tree.nodes.new('ShaderNodeBsdfPrincipled')
             main_node.location = 0, 0
         elif nodetype == "unlit":
-            main_node = node_tree.nodes.new('ShaderNodeBackground')
-            main_node.location = 0, 0
+            main_node = node_tree.nodes.new('ShaderNodeEmission')
+            main_node.location = 750, -300
 
         if pypbr.color_type == gltf.SIMPLE:
 
@@ -297,6 +297,32 @@ class BlenderPbr():
                 node_tree.links.new(metallic_text.inputs[0], metallic_mapping.outputs[0])
 
         # link node to output
-
-        node_tree.links.new(output_node.inputs[0], main_node.outputs[0])
+        if nodetype == 'principled':
+            node_tree.links.new(output_node.inputs[0], main_node.outputs[0])
+        elif nodetype == 'unlit':
+            mix = node_tree.nodes.new('ShaderNodeMixShader')
+            mix.location = 1000, 0
+            path = node_tree.nodes.new('ShaderNodeLightPath')
+            path.location = 500, 300
+            if pypbr.color_type != gltf.SIMPLE:
+                math = node_tree.nodes.new('ShaderNodeMath')
+                math.location = 750, 200
+                math.operation = 'MULTIPLY'
+
+                # Set material alpha mode to blend
+                # This is needed for Eevee
+                material.blend_method = 'HASHED' # TODO check best result in eevee
+
+            transparent = node_tree.nodes.new('ShaderNodeBsdfTransparent')
+            transparent.location = 750, 0
+
+            node_tree.links.new(output_node.inputs[0], mix.outputs[0])
+            node_tree.links.new(mix.inputs[2], main_node.outputs[0])
+            node_tree.links.new(mix.inputs[1], transparent.outputs[0])
+            if pypbr.color_type != gltf.SIMPLE:
+                node_tree.links.new(math.inputs[0], path.outputs[0])
+                node_tree.links.new(math.inputs[1], text_node.outputs[1])
+                node_tree.links.new(mix.inputs[0], math.outputs[0])
+            else:
+                node_tree.links.new(mix.inputs[0], path.outputs[0])