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--- blender:blenderdata [2017/11/21 18:08]
dwheele [Object]
+++ blender:blenderdata [2017/11/21 18:26] (current)
dwheele [Data Access]
@@ Line 20: / Line 20: @@
   * ''for ob in bpy.data.objects'' # returns all of the objects iterable
-To create a new object:
+=== To create a new object: ===
   * Create a datablock with ''datablock = bpy.data.lamps.new'' (or ''bpy.data.objects.new'')
@@ Line 51: / Line 51: @@
 </code>
+=== Vertex Groups ===
+<code python>
+for vertexGroup in ob.vertex.groups:
+  print vertexGroup.name
+</code>
+After establishing a group, you can add vertices to it:
+<code python>
+verts = ((x,y,z), (x+w, y,z), (x+w,y,z+h), (x,y,z+h), \
+    (x,y+t,z), (x+w,y+t,z), (x+w,y+t,z+h), (x,y+t,z+h))
+faces = ((0,1,2,3), (5,4,7,6), (5,6,2,1), (6,7,3,2), (7,4,0,3), (4,5,1,0))
+me = ob.data
+me.name = name+'Mesh'
+# Create mesh from given verts, faces.
+me.from_pydata(verts, [], faces)
+# Update mesh with new data
+me.update()
+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
+</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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