glTF exporter: clamp base color factor to [0,1], as hard rgb values can be outside

io_scene_gltf2/__init__.py

@@ -4,7 +4,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (3, 4, 25),
+    "version": (3, 4, 26),
     'blender': (3, 3, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_pbr_metallic_roughness.py

@@ -71,6 +71,9 @@ def __gather_base_color_factor(blender_material, export_settings):
     if rgb is None: rgb = [1.0, 1.0, 1.0]
     if alpha is None: alpha = 1.0
 
+    # Need to clamp between 0.0 and 1.0: Blender color can be outside this range
+    rgb = [max(min(c, 1.0), 0.0) for c in rgb]
+
     rgba = [*rgb, alpha]
 
     if rgba == [1, 1, 1, 1]: return None