add comment about the necessary matrix calc

klocs · Dec 2, 2019 · f695e6b · f695e6b
1 parent 2a476e1
commit f695e6b
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/xs/src/libslic3r/IO/TMF.cpp b/xs/src/libslic3r/IO/TMF.cpp
@@ -818,6 +818,9 @@ TMFParserContext::apply_transformation(ModelInstance *instance, const Transforma
     instance->offset.x = single_transformations[0];
     instance->offset.y = single_transformations[1];
 
+    // Complete = Instance * Additional
+    // -> Instance^-1 * Complete = (Instance^-1 * Instance) * Additional
+    // -> Instance^-1 * Complete = Additional
     instance->additional_trafo = TransformationMatrix::multiply(
         instance->get_trafo_matrix().inverse(),
         complete_trafo);