feat: Implement object transformation

Signed-off-by: Lucas Schwiderski <lucas@lschwiderski.de>

addons/bitsquid/import_bsi.py

@@ -18,6 +18,7 @@
 import zlib
 import json
 import bpy
+import math
 from mathutils import Vector, Matrix
 
 
@@ -234,6 +235,23 @@ def create_object(self, context, name, node_data, geometries):
     return mesh
 
 
+def matrix_from_list(list):
+    """
+    Builds a square Matrix from a list of values in column order.
+
+    When cross-referencing the `bsi_importer` and Maya's Python docs,
+    it appears as though matrices stored in `.bsi` should be row ordered,
+    but they are, in fact, column ordered.
+    """
+    stride = math.sqrt(len(list))
+    rows = []
+    for i in range(stride):
+        row = (list[i], list[i+stride], list[i+(stride*2)], list[i+(stride*3)])
+        rows.append(row)
+
+    return Matrix(rows)
+
+
 def import_node(self, context, name, node_data, global_data):
     """Import a BSI node. Recurses into child nodes."""
     print("[import_node]", name, node_data)
@@ -246,11 +264,13 @@ def import_node(self, context, name, node_data, global_data):
     else:
         print("[import_node] Adding empty for '{}'".format(name))
         obj = bpy.data.objects.new(name, None)
+        # Decrease axis size to prevent overcrowding in the viewport
+        obj.empty_display_size = 0.1
 
-    # Needs to happen before scaling can be applied.
-    # TODO: Check if above is true, was seen on Stackoverflow.
     obj.matrix_world = Matrix()
-    # TODO: Apply tranformation matrix in `node_data["local"]`
+    if "local" in node_data:
+        mat = matrix_from_list(node_data["local"])
+        obj.matrix_local = mat
 
     if "children" in node_data:
         for child_name, child_data in node_data["children"].items():