From df4a329a892f8a89134b9d9cd0be12b18bf55453 Mon Sep 17 00:00:00 2001
From: CarlOlson <CarlOlson@users.noreply.github.com>
Date: Sun, 28 Aug 2022 14:10:01 +0900
Subject: [PATCH] make model rotation act like Blender and other 3D modelers

---
 application/sources/model_widget.cc | 3 ++-
 application/sources/model_widget.h  | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/application/sources/model_widget.cc b/application/sources/model_widget.cc
index bc19d57d..a44979db 100644
--- a/application/sources/model_widget.cc
+++ b/application/sources/model_widget.cc
@@ -320,6 +320,7 @@ bool ModelWidget::inputMousePressEventFromOtherWidget(QMouseEvent *event, bool n
             m_moveStartPos = mapToParent(convertInputPosFromOtherWidget(event));
             m_moveStartGeometry = geometry();
             m_moveStarted = true;
+            m_directionOnMoveStart = abs(m_xRot) > 180 * 8 ? -1 : 1;
         }
         return true;
     }
@@ -389,7 +390,7 @@ bool ModelWidget::inputMouseMoveEventFromOtherWidget(QMouseEvent *event)
             }
         } else {
             setXRotation(m_xRot + 8 * dy);
-            setYRotation(m_yRot + 8 * dx);
+            setYRotation(m_yRot + 8 * dx * m_directionOnMoveStart);
         }
     }
     m_lastPos = pos;
diff --git a/application/sources/model_widget.h b/application/sources/model_widget.h
index c79477bf..f6c0c624 100644
--- a/application/sources/model_widget.h
+++ b/application/sources/model_widget.h
@@ -92,6 +92,7 @@ private:
     int m_xRot = m_defaultXRotation;
     int m_yRot = m_defaultYRotation;
     int m_zRot = m_defaultZRotation;
+    int m_directionOnMoveStart = 0;
     ModelShaderProgram *m_program = nullptr;
     bool m_moveStarted = false;
     bool m_moveEnabled = true;