use class for camera handling,

orbit does not work. Need to figure out why

QtMeshViewer/Header/CameraInterface.h

@@ -0,0 +1,26 @@
+#pragma once
+#include <QMatrix4x4>
+
+class CameraInterface
+{
+public:
+	explicit CameraInterface() {};
+	virtual ~CameraInterface() {};
+
+// attributes
+protected:
+	QMatrix4x4 m_matrix;
+	double m_zSpeed = 1.0;
+
+// functions
+public:
+	virtual void setZoomSpeed(int percent) { m_zSpeed = (double) percent / 100; };
+
+	virtual void rotateAction(QVector2D diff) = 0;
+	virtual void moveAction(QVector2D diff) = 0;
+	virtual void wheelAction(double value) = 0;
+	virtual void resetView() { m_matrix = QMatrix4x4(); m_zSpeed = 1.0; };
+
+	virtual void recalculateMatrix() = 0;
+	virtual QMatrix4x4 getMatrix() { recalculateMatrix(); return m_matrix; };
+};