From 36e42ad73601c8d90adc86f0b801ab1aa394ce4e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20Br=C3=BCckner?= <mail@moritz-brueckner.de>
Date: Mon, 25 Oct 2021 19:43:13 +0200
Subject: [PATCH] Fix exporting textures from linked libraries

---
 blender/arm/material/cycles.py |  4 ++++
 blender/arm/utils.py           | 16 +++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/blender/arm/material/cycles.py b/blender/arm/material/cycles.py
index 91c1c47b..c0c70328 100644
--- a/blender/arm/material/cycles.py
+++ b/blender/arm/material/cycles.py
@@ -737,7 +737,9 @@ def node_name(s: str) -> str:
 
 ##
 
+
 def make_texture(image_node: bpy.types.ShaderNodeTexImage, tex_name: str, matname: str = None) -> Optional[Dict[str, Any]]:
+    """Creates a texture reference for the export data for a given texture node."""
     tex = {'name': tex_name}
 
     if matname is None:
@@ -768,6 +770,8 @@ def make_texture(image_node: bpy.types.ShaderNodeTexImage, tex_name: str, matnam
         else:
             log.warn(matname + '/' + image.name + ' - invalid file path')
             return None
+    else:
+        filepath = arm.utils.to_absolute_path(filepath, image.library)
 
     # Reference image name
     texpath = arm.utils.asset_path(filepath)
diff --git a/blender/arm/utils.py b/blender/arm/utils.py
index 1b4d7543..6d00775e 100755
--- a/blender/arm/utils.py
+++ b/blender/arm/utils.py
@@ -104,7 +104,8 @@ def blend_name():
 def build_dir():
     return 'build_' + safestr(blend_name())
 
-def get_fp():
+
+def get_fp() -> str:
     wrd = bpy.data.worlds['Arm']
     if wrd.arm_project_root != '':
         return bpy.path.abspath(wrd.arm_project_root)
@@ -127,9 +128,22 @@ def get_fp():
             s += os.path.sep
         return s
 
+
 def get_fp_build():
     return os.path.join(get_fp(), build_dir())
 
+
+def to_absolute_path(path: str, from_library: Optional[bpy.types.Library] = None) -> str:
+    """Convert the given absolute or relative path into an absolute path.
+
+    - If `from_library` is not set (default), a given relative path will be
+      interpreted as relative to the project directory.
+    - If `from_library` is set, a given relative path will be interpreted as
+      relative to the filepath of the specified library.
+    """
+    return os.path.normpath(bpy.path.abspath(path, start=get_fp(), library=from_library))
+
+
 def get_os() -> str:
     s = platform.system()
     if s == 'Windows':