materials.py: Only modify selected object(s), various code maintenance

See issue #9

materials.py

@@ -1,57 +1,68 @@
-# Original script (interpolation): Techy5
-# Expanded script: GreenXenith
+# Original script: random-geek
+# Contributors: GreenXenith, sbrl, VorTechnix
 
 ### Use better materials and support alpha ###
 # Usage: Open or copy script in Blender
-# Run script while object is selected
+# Run script WHILE OBJECT IS SELECTED
 
 import bpy
 
-for mat in bpy.data.materials:
-    try:
-        nodes = mat.node_tree.nodes
-        links = mat.node_tree.links
+targetMats = []
+
+for obj in bpy.context.selected_objects:
+    for slot in obj.material_slots:
+        mat = slot.material
+
+        if mat not in targetMats:
+            targetMats.append(mat)
+
+for mat in targetMats:
+    nodes = mat.node_tree.nodes
+    links = mat.node_tree.links
 
-        # Remove all nodes except texture
-        for node in nodes:
-            if node.type != "TEX_IMAGE":
-                nodes.remove(node)
+    # Remove all nodes except texture
+    for node in nodes:
+        if node.bl_idname != "ShaderNodeTexImage":
+            nodes.remove(node)
 
-        # Change image interpolation
+    # Get texture node
+    try:
         tex = nodes["Image Texture"]
-        tex.interpolation = "Closest"
-        tex.location = 0, 0
+    except KeyError:
+        print(f"[materials.py] Skipped material '{mat.name}': Image texture not found.")
+        continue
 
-        # Create texture coordinate node
-        coord = nodes.new("ShaderNodeTexCoord")
-        coord.location = -400, 0
+    # Change image interpolation
+    tex.interpolation = "Closest"
+    tex.location = 0, 0
 
-        # Create mapping node
-        map = nodes.new("ShaderNodeMapping")
-        map.location = -200, 0
+    # Create texture coordinate node
+    coord = nodes.new("ShaderNodeTexCoord")
+    coord.location = -400, 0
 
-        # Create principled shader
-        prin = nodes.new("ShaderNodeBsdfPrincipled")
-        prin.location = 300, 0
-        prin.inputs["Specular"].default_value = 0
+    # Create mapping node
+    map = nodes.new("ShaderNodeMapping")
+    map.location = -200, 0
 
-        # Create output
-        out = nodes.new("ShaderNodeOutputMaterial")
-        out.location = 600, 0
+    # Create principled shader
+    prin = nodes.new("ShaderNodeBsdfPrincipled")
+    prin.location = 300, 0
+    prin.inputs["Specular"].default_value = 0
 
-        # Link everything
-        links.new(coord.outputs[2], map.inputs[0]) # Coord > Map
-        links.new(map.outputs[0], tex.inputs[0]) # Map > Texture
-        links.new(tex.outputs[0], prin.inputs[0]) # Texture Color > Principled Color
-        links.new(tex.outputs[1], prin.inputs[19]) # Texture Alpha > Principled Alpha
-        links.new(prin.outputs[0], out.inputs[0]) # Principled > Output
+    # Create output
+    out = nodes.new("ShaderNodeOutputMaterial")
+    out.location = 600, 0
 
-        # Deselect all
-        for node in nodes:
-            node.select = False
+    # Link everything
+    links.new(coord.outputs["UV"], map.inputs["Vector"])
+    links.new(map.outputs["Vector"], tex.inputs["Vector"])
+    links.new(tex.outputs["Color"], prin.inputs["Base Color"])
+    links.new(tex.outputs["Alpha"], prin.inputs["Alpha"])
+    links.new(prin.outputs["BSDF"], out.inputs["Surface"])
 
-        # Set blend mode
-        mat.blend_method = "CLIP"
+    # Deselect all
+    for node in nodes:
+        node.select = False
 
-    except:
-        continue
+    # Set blend mode
+    mat.blend_method = "CLIP"