Export world transforms for scene objects
authorMikko Rasa <tdb@tdb.fi>
Tue, 4 Jun 2019 10:39:27 +0000 (13:39 +0300)
committerMikko Rasa <tdb@tdb.fi>
Tue, 4 Jun 2019 10:39:27 +0000 (13:39 +0300)
The location, rotation and scale properties contain transform components
relative to the somewhat arbitrary basis matrix.  Obtain the values from
the world matrix instead.  A drawback is that nonuniform or negative
scaling can produce inconsistent results.

blender/io_mspgl/export_scene.py

index c66feed7aadf9c1218c379a51b94d92fb74e119e..abdd61b062ed6ae72bc2297b1b7d5e3c75d0e3bc 100644 (file)
@@ -110,21 +110,22 @@ class SceneExporter:
                for o in objs:
                        obj_res = resources[prototypes[o.name].name+".object"]
                        st = scene_res.create_reference_statement("object", obj_res, o.name)
-                       # XXX Parent relationships screw up the location and rotation
+
                        ss = Statement("transform")
-                       ss.sub.append(Statement("position", o.location[0], o.location[1], o.location[2]))
-                       if o.rotation_mode=="AXIS_ANGLE":
-                               angle = o.rotation_axis_angle[0]
-                               axis = o.rotation_axis_angle[1:]
+
+                       loc = o.matrix_world.to_translation()
+                       ss.sub.append(Statement("position", *tuple(loc)))
+
+                       quat = o.matrix_world.to_quaternion()
+                       if o.rotation_mode in ('XYZ', 'XZY', 'YXZ', 'YZX', 'ZXY', 'ZYX'):
+                               angles = [a*180/math.pi for a in quat.to_euler()]
+                               ss.sub.append(Statement("euler", *angles));
                        else:
-                               if o.rotation_mode=="QUATERNION":
-                                       q = o.rotation_quaternion
-                               else:
-                                       q = o.rotation_euler.to_quaternion()
-                               angle = q.angle
-                               axis = q.axis
-                       ss.sub.append(Statement("rotation", angle*180/math.pi, axis[0], axis[1], axis[2]))
-                       ss.sub.append(Statement("scale", o.scale[0], o.scale[1], o.scale[2]))
+                               ss.sub.append(Statement("rotation", quat.angle*180/math.pi, *tuple(quat.axis)))
+
+                       scale = o.matrix_world.to_scale()
+                       ss.sub.append(Statement("scale", *tuple(scale)))
+
                        st.sub.append(ss)
                        scene_res.statements.append(st)