glTF importer: fix default emissive factor default

* Emissive factor default is 0.0 / 0.0 / 0.0
* Enhancement: change 3 maths node by a MixRGBNode (multiply mode)

1 files changed, 14 insertions, 29 deletions

diff --git a/io_scene_gltf2/blender/imp/gltf2_blender_map_emissive.py b/io_scene_gltf2/blender/imp/gltf2_blender_map_emissive.py
index c3d0cb22..22af5ccb 100755
--- a/io_scene_gltf2/blender/imp/gltf2_blender_map_emissive.py
+++ b/io_scene_gltf2/blender/imp/gltf2_blender_map_emissive.py
@@ -40,7 +40,8 @@ class BlenderEmissiveMap():
 
         # check if there is some emssive_factor on material
         if pymaterial.emissive_factor is None:
-            pymaterial.emissive_factor = [1.0, 1.0, 1.0]
+            # Default in glTF specification is 0/0/0 --> No emission
+            pymaterial.emissive_factor = [0.0, 0.0, 0.0]
 
         # retrieve principled node and output node
         principled = get_preoutput_node_output(node_tree)
@@ -50,10 +51,16 @@ class BlenderEmissiveMap():
         emit = node_tree.nodes.new('ShaderNodeEmission')
         emit.location = 0, 1000
         if pymaterial.emissive_factor != [1.0, 1.0, 1.0]:
-            separate = node_tree.nodes.new('ShaderNodeSeparateRGB')
-            separate.location = -750, 1000
-            combine = node_tree.nodes.new('ShaderNodeCombineRGB')
-            combine.location = -250, 1000
+            mult_node = node_tree.nodes.new('ShaderNodeMixRGB')
+            mult_node.blend_type = 'MULTIPLY'
+            mult_node.inputs['Fac'].default_value = 1.0
+            mult_node.location = -500, 1000
+            mult_node.inputs['Color2'].default_value = [
+                                                        pymaterial.emissive_factor[0],
+                                                        pymaterial.emissive_factor[1],
+                                                        pymaterial.emissive_factor[2],
+                                                        1.0,
+                                                        ]
         mapping = node_tree.nodes.new('ShaderNodeMapping')
         mapping.location = -1500, 1000
         uvmap = node_tree.nodes.new('ShaderNodeUVMap')
@@ -72,34 +79,12 @@ class BlenderEmissiveMap():
         add = node_tree.nodes.new('ShaderNodeAddShader')
         add.location = 500, 500
 
-        if pymaterial.emissive_factor != [1.0, 1.0, 1.0]:
-            math_R = node_tree.nodes.new('ShaderNodeMath')
-            math_R.location = -500, 1500
-            math_R.operation = 'MULTIPLY'
-            math_R.inputs[1].default_value = pymaterial.emissive_factor[0]
-
-            math_G = node_tree.nodes.new('ShaderNodeMath')
-            math_G.location = -500, 1250
-            math_G.operation = 'MULTIPLY'
-            math_G.inputs[1].default_value = pymaterial.emissive_factor[1]
-
-            math_B = node_tree.nodes.new('ShaderNodeMath')
-            math_B.location = -500, 1000
-            math_B.operation = 'MULTIPLY'
-            math_B.inputs[1].default_value = pymaterial.emissive_factor[2]
-
         # create links
         node_tree.links.new(mapping.inputs[0], uvmap.outputs[0])
         node_tree.links.new(text.inputs[0], mapping.outputs[0])
         if pymaterial.emissive_factor != [1.0, 1.0, 1.0]:
-            node_tree.links.new(separate.inputs[0], text.outputs[0])
-            node_tree.links.new(math_R.inputs[0], separate.outputs[0])
-            node_tree.links.new(math_G.inputs[0], separate.outputs[1])
-            node_tree.links.new(math_B.inputs[0], separate.outputs[2])
-            node_tree.links.new(combine.inputs[0], math_R.outputs[0])
-            node_tree.links.new(combine.inputs[1], math_G.outputs[0])
-            node_tree.links.new(combine.inputs[2], math_B.outputs[0])
-            node_tree.links.new(emit.inputs[0], combine.outputs[0])
+            node_tree.links.new(mult_node.inputs[1], text.outputs[0])
+            node_tree.links.new(emit.inputs[0], mult_node.outputs[0])
         else:
             node_tree.links.new(emit.inputs[0], text.outputs[0])