1 files changed, 59 insertions, 0 deletions
diff --git a/io_scene_gltf2/blender/com/gltf2_blender_material_helpers.py b/io_scene_gltf2/blender/com/gltf2_blender_material_helpers.py
new file mode 100755
index 00000000..05f35954
--- /dev/null
+++ b/io_scene_gltf2/blender/com/gltf2_blender_material_helpers.py
@@ -0,0 +1,59 @@
+# Copyright 2018 The glTF-Blender-IO authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+def get_output_node(node_tree):
+    """Retrive output node."""
+    output = [node for node in node_tree.nodes if node.type == 'OUTPUT_MATERIAL'][0]
+    return output
+
+
+def get_output_surface_input(node_tree):
+    """Retrieve surface input of output node."""
+    output_node = get_output_node(node_tree)
+    return output_node.inputs['Surface']
+
+
+def get_diffuse_texture(node_tree):
+    """Retrieve diffuse texture node."""
+    for node in node_tree.nodes:
+        print(node.name)
+        if node.label == 'BASE COLOR':
+            return node
+
+    return None
+
+
+def get_preoutput_node_output(node_tree):
+    """Retrieve node just before output node."""
+    output_node = get_output_node(node_tree)
+    preoutput_node = output_node.inputs['Surface'].links[0].from_node
+
+    # Pre output node is Principled BSDF or any BSDF => BSDF
+    if 'BSDF' in preoutput_node.type:
+        return preoutput_node.outputs['BSDF']
+    elif 'SHADER' in preoutput_node.type:
+        return preoutput_node.outputs['Shader']
+    else:
+        print(preoutput_node.type)
+
+
+def get_base_color_node(node_tree):
+    """Returns the last node of the diffuse block."""
+    for node in node_tree.nodes:
+        if node.label == 'BASE COLOR':
+            return node
+
+    return None
+