diff -r 24275a4064f4 -r 8c9fff699241 src/gl/partrenderer.cpp
--- a/src/gl/partrenderer.cpp	Wed Jul 28 08:23:09 2021 +0300
+++ b/src/gl/partrenderer.cpp	Wed Jul 28 13:22:51 2021 +0300
@@ -26,6 +26,9 @@
 #include "partrenderer.h"
 #include "model.h"
 
+static constexpr double MIN_ZOOM = -3.0;
+static constexpr double MAX_ZOOM = 3.0;
+
 PartRenderer::PartRenderer(
 	Model* model,
 	DocumentManager* documents,