glTF exporter: export vertex color alpha

2 files changed, 15 insertions, 7 deletions

diff --git a/io_scene_gltf2/__init__.py b/io_scene_gltf2/__init__.py
index 7f49cc4c..fb2423aa 100755
--- a/io_scene_gltf2/__init__.py
+++ b/io_scene_gltf2/__init__.py
@@ -15,7 +15,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (0, 9, 43),
+    "version": (0, 9, 44),
     'blender': (2, 80, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_extract.py b/io_scene_gltf2/blender/exp/gltf2_blender_extract.py
index b5c09de7..69c3f1d6 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_extract.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_extract.py
@@ -621,12 +621,20 @@ def extract_primitives(glTF, blender_mesh, blender_vertex_groups, modifiers, exp
                 for color_index in range(0, color_max):
                     color_name = COLOR_PREFIX + str(color_index)
                     color = vertex_colors[color_name].data[loop_index].color
-                    colors.append([
-                        color_srgb_to_scene_linear(color[0]),
-                        color_srgb_to_scene_linear(color[1]),
-                        color_srgb_to_scene_linear(color[2]),
-                        1.0
-                    ])
+                    if len(color) == 3:
+                        colors.append([
+                            color_srgb_to_scene_linear(color[0]),
+                            color_srgb_to_scene_linear(color[1]),
+                            color_srgb_to_scene_linear(color[2]),
+                            1.0
+                        ])
+                    else:
+                        colors.append([
+                            color_srgb_to_scene_linear(color[0]),
+                            color_srgb_to_scene_linear(color[1]),
+                            color_srgb_to_scene_linear(color[2]),
+                            color[3]
+                        ])
 
             #