glTF exporter: Option to not export texture images

4 files changed, 25 insertions, 3 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 a15f0f8d..ff0c2cfe 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials.py
@@ -114,7 +114,10 @@ def __gather_emissive_factor(blender_material, export_settings):
     if emissive_socket is None:
         emissive_socket = gltf2_blender_get.get_socket_old(blender_material, "EmissiveFactor")
     if isinstance(emissive_socket, bpy.types.NodeSocket):
-        factor = gltf2_blender_get.get_factor_from_socket(emissive_socket, kind='RGB')
+        if export_settings['gltf_image_format'] != "NONE":
+            factor = gltf2_blender_get.get_factor_from_socket(emissive_socket, kind='RGB')
+        else:
+            factor = gltf2_blender_get.get_const_from_default_value_socket(emissive_socket, kind='RGB')
 
         if factor is None and emissive_socket.is_linked:
             # In glTF, the default emissiveFactor is all zeros, so if an emission texture is connected,
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_pbr_metallic_roughness.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_pbr_metallic_roughness.py
index 88f3eb69..e885b21b 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_pbr_metallic_roughness.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_materials_pbr_metallic_roughness.py
@@ -53,7 +53,10 @@ def __gather_base_color_factor(blender_material, export_settings):
 
     alpha_socket = gltf2_blender_get.get_socket(blender_material, "Alpha")
     if isinstance(alpha_socket, bpy.types.NodeSocket):
-        alpha = gltf2_blender_get.get_factor_from_socket(alpha_socket, kind='VALUE')
+        if export_settings['gltf_image_format'] != "NONE": 
+            alpha = gltf2_blender_get.get_factor_from_socket(alpha_socket, kind='VALUE')
+        else:
+            alpha = gltf2_blender_get.get_const_from_default_value_socket(alpha_socket, kind='VALUE')
 
     base_color_socket = gltf2_blender_get.get_socket(blender_material, "Base Color")
     if base_color_socket is None:
@@ -61,7 +64,10 @@ def __gather_base_color_factor(blender_material, export_settings):
     if base_color_socket is None:
         base_color_socket = gltf2_blender_get.get_socket_old(blender_material, "BaseColorFactor")
     if isinstance(base_color_socket, bpy.types.NodeSocket):
-        rgb = gltf2_blender_get.get_factor_from_socket(base_color_socket, kind='RGB')
+        if export_settings['gltf_image_format'] != "NONE":
+            rgb = gltf2_blender_get.get_factor_from_socket(base_color_socket, kind='RGB')
+        else:
+            rgb = gltf2_blender_get.get_const_from_default_value_socket(base_color_socket, kind='RGB')
 
     if rgb is None: rgb = [1.0, 1.0, 1.0]
     if alpha is None: alpha = 1.0
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_texture.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_texture.py
index a8ec7f79..96146523 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_texture.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_texture.py
@@ -35,6 +35,7 @@ def gather_texture(
     :param export_settings: configuration of the export
     :return: a glTF 2.0 texture with sampler and source embedded (will be converted to references by the exporter)
     """
+
     if not __filter_texture(blender_shader_sockets, export_settings):
         return None
 
@@ -56,6 +57,9 @@ def gather_texture(
 
 
 def __filter_texture(blender_shader_sockets, export_settings):
+    # User doesn't want to export textures
+    if export_settings['gltf_image_format'] == "NONE":
+        return None
     return True
 
 
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_get.py b/io_scene_gltf2/blender/exp/gltf2_blender_get.py
index e925bf25..0b1946e5 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_get.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_get.py
@@ -250,6 +250,15 @@ def get_factor_from_socket(socket, kind):
 
     return None
 
+def get_const_from_default_value_socket(socket, kind):
+    if kind == 'RGB':
+        if socket.type != 'RGBA': return None
+        return list(socket.default_value)[:3]
+    if kind == 'VALUE':
+        if socket.type != 'VALUE': return None
+        return socket.default_value
+    return None
+
 
 def get_const_from_socket(socket, kind):
     if not socket.is_linked: