Import images as planes: use Principled BSDF for emission mode

Since Blender 2.91, the Principled BSDF node has an Emission Strength
input. It can thus replace the previous setup used to import images as
emissive planes. This can improve export compatibility.

Reviewed By: Bastien Montagne (mont29)

Differential revision: https://developer.blender.org/D9669

1 files changed, 11 insertions, 6 deletions

diff --git a/io_import_images_as_planes.py b/io_import_images_as_planes.py
index e5b2eae2..d842566e 100644
--- a/io_import_images_as_planes.py
+++ b/io_import_images_as_planes.py
@@ -21,7 +21,7 @@
 bl_info = {
     "name": "Import Images as Planes",
     "author": "Florian Meyer (tstscr), mont29, matali, Ted Schundler (SpkyElctrc)",
-    "version": (3, 3, 2),
+    "version": (3, 4, 0),
     "blender": (2, 91, 0),
     "location": "File > Import > Images as Planes or Add > Mesh > Images as Planes",
     "description": "Imports images and creates planes with the appropriate aspect ratio. "
@@ -1014,15 +1014,20 @@ class IMPORT_IMAGE_OT_to_plane(Operator, AddObjectHelper):
             core_shader = node_tree.nodes.new('ShaderNodeBsdfPrincipled')
         elif self.shader == 'SHADELESS':
             core_shader = get_shadeless_node(node_tree)
-        else:  # Emission Shading
-            core_shader = node_tree.nodes.new('ShaderNodeEmission')
-            core_shader.inputs['Strength'].default_value = self.emit_strength
+        elif self.shader == 'EMISSION':
+            core_shader = node_tree.nodes.new('ShaderNodeBsdfPrincipled')
+            core_shader.inputs['Emission Strength'].default_value = self.emit_strength
+            core_shader.inputs['Base Color'].default_value = (0.0, 0.0, 0.0, 1.0)
+            core_shader.inputs['Specular'].default_value = 0.0
 
         # Connect color from texture
-        node_tree.links.new(core_shader.inputs[0], tex_image.outputs['Color'])
+        if self.shader in {'PRINCIPLED', 'SHADELESS'}:
+            node_tree.links.new(core_shader.inputs[0], tex_image.outputs['Color'])
+        elif self.shader == 'EMISSION':
+            node_tree.links.new(core_shader.inputs['Emission'], tex_image.outputs['Color'])
 
         if self.use_transparency:
-            if self.shader == 'PRINCIPLED':
+            if self.shader in {'PRINCIPLED', 'EMISSION'}:
                 node_tree.links.new(core_shader.inputs['Alpha'], tex_image.outputs['Alpha'])
             else:
                 bsdf_transparent = node_tree.nodes.new('ShaderNodeBsdfTransparent')