Differences

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--- blender:blenderdata [2017/11/21 18:14]
dwheele [Object]
+++ blender:blenderdata [2017/11/21 18:26] (current)
dwheele [Data Access]
@@ Line 12: / Line 12: @@
 ===== Data Access =====
-=== Object ====
+==== Object ====
 === To get an existing object: ===
@@ Line 76: / Line 76: @@
 vg = ob.vertex_groups.new("Card Face")
 vg.add([0,1,2,3],1,"ADD")
-# The indexes 0,1,2,3 are referring to the vertices in the order they are added to the object
+# The indexes 0,1,2,3 are referring to the vertices
+# in the order they are added to the object
 </code>
+==== Polygons ====
+Brief example
+<code python>
+for p in ob.data.polygons:
+  p.material_index = ms_index
+</code>
+==== Material ====
+Materials are established separate from Objects, then links are made from Objects to Materials.
+=== To get an existing material: ===
+  * ''mat = bpy.data.materials["Material"]''
+  * ''mat= bpy.data.materials.get("Material")'' # If not found, returns None gracefully
+=== To create a new material: ===
+<code python>
+mat = bpy.data.materials.new(name="Card Paper")
+</code>
+Assign material to an object **ob**
+<code python>
+if not(ob.data.materials.get(mat.name)):
+  ob.data.materials.append(mat)
+  # this example adds material to all polygons in ob
+  ms_index = ob.material_slots.find("Card Paper")
+  for p in ob.data.polygons:
+    p.material_index = ms_index
+</code>

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