glTF exporter: KHR_material_volume: thickness is now default to 0.0 (as in specification)

1 files changed, 3 insertions, 3 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_volume.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_volume.py
index 57b00700..8a69e3f6 100644
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_volume.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_volume.py
@@ -27,12 +27,12 @@ def export_volume(blender_material, export_settings):
 
     thicknesss_socket = gltf2_blender_get.get_socket_old(blender_material, 'Thickness')
     if thicknesss_socket is None:
-        volume_extension['thicknessFactor'] = 1.0
+        # If no thickness (here because there is no glTF Material Output node), no volume extension export
+            return None, None
 
     density_socket = gltf2_blender_get.get_socket(blender_material, 'Density', volume=True)
     attenuation_color_socket = gltf2_blender_get.get_socket(blender_material, 'Color', volume=True)
-    if density_socket is None or attenuation_color_socket is None:
-        return None, None
+    # Even if density or attenuation are not set, we export volume extension
 
     if isinstance(attenuation_color_socket, bpy.types.NodeSocket):
         rgb = gltf2_blender_get.get_const_from_default_value_socket(attenuation_color_socket, kind='RGB')