diff --git a/src/common/parameters/value/value.h b/src/common/parameters/value/value.h
index 87a8f724b..3aad13b68 100644
--- a/src/common/parameters/value/value.h
+++ b/src/common/parameters/value/value.h
@@ -98,6 +98,13 @@ public:
 	virtual Value*  clone() const                                = 0;
 	virtual bool    operator==(const Value& p) const             = 0;
 	virtual void    fillToXMLElement(QDomElement& element) const = 0;
+
+	template <class Val>
+	bool isOfType() const
+	{
+		const Val* t = dynamic_cast<const Val*>(this);
+		return (t != nullptr);
+	}
 };
 
 #endif //MESHLAB_VALUE_H
diff --git a/src/common_gui/rich_parameter/richparameterlistframe.cpp b/src/common_gui/rich_parameter/richparameterlistframe.cpp
index 2f8fc9a2a..0ef0a979a 100644
--- a/src/common_gui/rich_parameter/richparameterlistframe.cpp
+++ b/src/common_gui/rich_parameter/richparameterlistframe.cpp
@@ -219,66 +219,66 @@ RichParameterWidget* RichParameterListFrame::createWidgetFromRichParameter(
 	const RichParameter& pd,
 	const RichParameter& def)
 {
-	if (pd.isOfType<RichAbsPerc>()) {
-		return new AbsPercWidget(parent, (const RichAbsPerc&) pd, (const RichAbsPerc&) def);
+	if (pd.isOfType<RichAbsPerc>() && def.isOfType<RichAbsPerc>()) {
+		return new AbsPercWidget(parent, (const RichAbsPerc&) pd, (const FloatValue&) def.value());
 	}
-	else if (pd.isOfType<RichDynamicFloat>()) {
+	else if (pd.isOfType<RichDynamicFloat>() && def.isOfType<RichDynamicFloat>()) {
 		return new DynamicFloatWidget(
 			parent, (const RichDynamicFloat&) pd, (const RichDynamicFloat&) def);
 	}
-	else if (pd.isOfType<RichEnum>()) {
+	else if (pd.isOfType<RichEnum>() && def.isOfType<RichEnum>()) {
 		return new EnumWidget(parent, (const RichEnum&) pd, (const RichEnum&) def);
 	}
-	else if (pd.isOfType<RichBool>()) {
-		return new BoolWidget(parent, (const RichBool&) pd, (const RichBool&) def);
+	else if (pd.isOfType<RichBool>() && def.isOfType<RichBool>()) {
+		return new BoolWidget(parent, (const RichBool&) pd, (const BoolValue&) def.value());
 	}
-	else if (pd.isOfType<RichInt>()) {
+	else if (pd.isOfType<RichInt>() && def.isOfType<RichInt>()) {
 		return new IntWidget(parent, (const RichInt&) pd, (const RichInt&) def);
 	}
-	else if (pd.isOfType<RichFloat>()) {
+	else if (pd.isOfType<RichFloat>() && def.isOfType<RichFloat>()) {
 		return new FloatWidget(parent, (const RichFloat&) pd, (const RichFloat&) def);
 	}
-	else if (pd.isOfType<RichString>()) {
+	else if (pd.isOfType<RichString>() && def.isOfType<RichString>()) {
 		return new StringWidget(parent, (const RichString&) pd, (const RichString&) def);
 	}
-	else if (pd.isOfType<RichMatrix44f>()) {
+	else if (pd.isOfType<RichMatrix44f>() && def.isOfType<RichMatrix44f>()) {
 		return new Matrix44Widget(
 			parent,
 			(const RichMatrix44f&) pd,
 			(const RichMatrix44f&) def,
 			reinterpret_cast<RichParameterListFrame*>(parent)->gla);
 	}
-	else if (pd.isOfType<RichPosition>()) {
+	else if (pd.isOfType<RichPosition>() && def.isOfType<RichPosition>()) {
 		return new PositionWidget(
 			parent,
 			(const RichPosition&) pd,
 			(const RichPosition&) def,
 			reinterpret_cast<RichParameterListFrame*>(parent)->gla);
 	}
-	else if (pd.isOfType<RichDirection>()) {
+	else if (pd.isOfType<RichDirection>() && def.isOfType<RichDirection>()) {
 		return new DirectionWidget(
 			parent,
 			(const RichDirection&) pd,
 			(const RichDirection&) def,
 			reinterpret_cast<RichParameterListFrame*>(parent)->gla);
 	}
-	else if (pd.isOfType<RichShotf>()) {
+	else if (pd.isOfType<RichShotf>() && def.isOfType<RichShotf>()) {
 		return new ShotWidget(
 			parent,
 			(const RichShotf&) pd,
 			(const RichShotf&) def,
 			reinterpret_cast<RichParameterListFrame*>(parent)->gla);
 	}
-	else if (pd.isOfType<RichColor>()) {
-		return new ColorWidget(parent, (const RichColor&) pd, (const RichColor&) def);
+	else if (pd.isOfType<RichColor>() && def.isOfType<RichColor>()) {
+		return new ColorWidget(parent, (const RichColor&) pd, (const ColorValue&) def.value());
 	}
-	else if (pd.isOfType<RichOpenFile>()) {
+	else if (pd.isOfType<RichOpenFile>() && def.isOfType<RichOpenFile>()) {
 		return new OpenFileWidget(parent, (const RichOpenFile&) pd, (const RichOpenFile&) def);
 	}
-	else if (pd.isOfType<RichSaveFile>()) {
+	else if (pd.isOfType<RichSaveFile>() && def.isOfType<RichSaveFile>()) {
 		return new SaveFileWidget(parent, (const RichSaveFile&) pd, (const RichSaveFile&) def);
 	}
-	else if (pd.isOfType<RichMesh>()) {
+	else if (pd.isOfType<RichMesh>() && def.isOfType<RichMesh>()) {
 		return new MeshWidget(parent, (const RichMesh&) pd, (const RichMesh&) def);
 	}
 	else {
diff --git a/src/common_gui/rich_parameter/widgets/abs_perc_widget.cpp b/src/common_gui/rich_parameter/widgets/abs_perc_widget.cpp
index bd07840f6..67c0bb0eb 100644
--- a/src/common_gui/rich_parameter/widgets/abs_perc_widget.cpp
+++ b/src/common_gui/rich_parameter/widgets/abs_perc_widget.cpp
@@ -29,13 +29,9 @@
 #include <QFileDialog>
 #include <common/ml_document/mesh_document.h>
 
-AbsPercWidget::AbsPercWidget(QWidget* p, const RichAbsPerc& rabs, const RichAbsPerc& rdef) :
-		RichParameterWidget(p, rabs, rdef)
-
+AbsPercWidget::AbsPercWidget(QWidget *p, const RichAbsPerc &rabs, const FloatValue &defaultValue) :
+		RichParameterWidget(p, rabs, defaultValue), m_min(rabs.min), m_max(rabs.max)
 {
-	m_min = rabs.min;
-	m_max = rabs.max;
-
 	descriptionLabel->setText(descriptionLabel->text() + " (abs and %)");
 
 	absSB  = new QDoubleSpinBox(this);
diff --git a/src/common_gui/rich_parameter/widgets/abs_perc_widget.h b/src/common_gui/rich_parameter/widgets/abs_perc_widget.h
index 81b192b4f..7d662319e 100644
--- a/src/common_gui/rich_parameter/widgets/abs_perc_widget.h
+++ b/src/common_gui/rich_parameter/widgets/abs_perc_widget.h
@@ -30,7 +30,7 @@ class AbsPercWidget : public RichParameterWidget
 {
 	Q_OBJECT
 public:
-	AbsPercWidget(QWidget* p, const RichAbsPerc& rabs, const RichAbsPerc& rdef);
+	AbsPercWidget(QWidget* p, const RichAbsPerc &rabs, const FloatValue &defaultValue);
 	~AbsPercWidget();
 
 	void                   addWidgetToGridLayout(QGridLayout* lay, const int r);
diff --git a/src/common_gui/rich_parameter/widgets/bool_widget.cpp b/src/common_gui/rich_parameter/widgets/bool_widget.cpp
index b3167b9dd..4665d288d 100644
--- a/src/common_gui/rich_parameter/widgets/bool_widget.cpp
+++ b/src/common_gui/rich_parameter/widgets/bool_widget.cpp
@@ -29,8 +29,8 @@
 #include <QFileDialog>
 #include <common/ml_document/mesh_document.h>
 
-BoolWidget::BoolWidget(QWidget* p, const RichBool& rb, const RichBool& rdef) :
-		RichParameterWidget(p, rb, rdef)
+BoolWidget::BoolWidget(QWidget *p, const RichBool &param, const BoolValue &defaultValue) :
+		RichParameterWidget(p, param, defaultValue)
 {
 	cb = new QCheckBox("", this);
 	cb->setToolTip(parameter->toolTip());
diff --git a/src/common_gui/rich_parameter/widgets/bool_widget.h b/src/common_gui/rich_parameter/widgets/bool_widget.h
index 9f7359918..166f5ae86 100644
--- a/src/common_gui/rich_parameter/widgets/bool_widget.h
+++ b/src/common_gui/rich_parameter/widgets/bool_widget.h
@@ -29,7 +29,7 @@
 class BoolWidget : public RichParameterWidget
 {
 public:
-	BoolWidget(QWidget* p, const RichBool& rb, const RichBool& rdef);
+	BoolWidget(QWidget* p, const RichBool& param, const BoolValue& defaultValue);
 	~BoolWidget();
 
 	void addWidgetToGridLayout(QGridLayout* lay, const int r);
diff --git a/src/common_gui/rich_parameter/widgets/color_widget.cpp b/src/common_gui/rich_parameter/widgets/color_widget.cpp
index 04fef7aa3..ac5ce0244 100644
--- a/src/common_gui/rich_parameter/widgets/color_widget.cpp
+++ b/src/common_gui/rich_parameter/widgets/color_widget.cpp
@@ -29,8 +29,8 @@
 #include <QFileDialog>
 #include <common/ml_document/mesh_document.h>
 
-ColorWidget::ColorWidget(QWidget* p, const RichColor& newColor, const RichColor& rdef) :
-		RichParameterWidget(p, newColor, rdef), pickcol()
+ColorWidget::ColorWidget(QWidget *p, const RichColor &newColor, const ColorValue &defaultValue) :
+		RichParameterWidget(p, newColor, defaultValue), pickcol(defaultValue.getColor())
 {
 	colorLabel  = new QLabel(this);
 	colorButton = new QPushButton(this);
@@ -51,7 +51,6 @@ ColorWidget::ColorWidget(QWidget* p, const RichColor& newColor, const RichColor&
 	widgets.push_back(colorLabel);
 	widgets.push_back(colorButton);
 
-	pickcol = parameter->value().getColor();
 	connect(colorButton, SIGNAL(clicked()), this, SLOT(pickColor()));
 	connect(this, SIGNAL(dialogParamChanged()), this, SLOT(setParameterChanged()));
 }
diff --git a/src/common_gui/rich_parameter/widgets/color_widget.h b/src/common_gui/rich_parameter/widgets/color_widget.h
index 87f4515e4..918ee6475 100644
--- a/src/common_gui/rich_parameter/widgets/color_widget.h
+++ b/src/common_gui/rich_parameter/widgets/color_widget.h
@@ -30,7 +30,7 @@ class ColorWidget : public RichParameterWidget
 {
 	Q_OBJECT
 public:
-	ColorWidget(QWidget* p, const RichColor& newColor, const RichColor& rdef);
+	ColorWidget(QWidget* p, const RichColor& newColor, const ColorValue& defaultValue);
 	~ColorWidget();
 
 	void addWidgetToGridLayout(QGridLayout* lay, const int r);