glTF exporter: fix PBR values when emission node is used

1 files changed, 6 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py
index 845024e5..71aec00d 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py
@@ -55,6 +55,12 @@ def gather_material(blender_material, export_settings):
         pbr_metallic_roughness=__gather_pbr_metallic_roughness(blender_material, orm_texture, export_settings)
     )
 
+    # If emissive is set, from an emissive node (not PBR)
+    # We need to set manually default values for 
+    # pbr_metallic_roughness.baseColor
+    if material.emissive_factor is not None and gltf2_blender_get.get_node_socket(blender_material, bpy.types.ShaderNodeBsdfPrincipled, "Base Color") is None:
+        material.pbr_metallic_roughness = gltf2_blender_gather_materials_pbr_metallic_roughness.get_default_pbr_for_emissive_node()
+
     export_user_extensions('gather_material_hook', export_settings, material, blender_material)
 
     return material