diff --git a/src/Engine/Parameter/Parameter.cpp b/src/Engine/Parameter/Parameter.cpp
index 2d6d28f..7529e56 100644
--- a/src/Engine/Parameter/Parameter.cpp
+++ b/src/Engine/Parameter/Parameter.cpp
@@ -66,6 +66,12 @@ enzo::bt::String enzo::prm::Parameter::evalString(unsigned int index) const
     return stringValues_[index];
 }
 
+unsigned int enzo::prm::Parameter::getVectorSize() const
+{
+    return template_.getSize();
+}
+
+
 const enzo::prm::Template& enzo::prm::Parameter::getTemplate()
 {
     return template_;
diff --git a/src/Engine/Parameter/Parameter.h b/src/Engine/Parameter/Parameter.h
index 1862ad2..fa94c5a 100644
--- a/src/Engine/Parameter/Parameter.h
+++ b/src/Engine/Parameter/Parameter.h
@@ -11,6 +11,7 @@ public:
     Parameter(Template prmTemplate);
     std::string getName() const;
     enzo::prm::Type getType() const;
+    unsigned int getVectorSize() const;
 
     bt::floatT evalFloat(unsigned int index=0) const;
     bt::String evalString(unsigned int index=0) const;
diff --git a/src/Engine/Parameter/Template.cpp b/src/Engine/Parameter/Template.cpp
index 1502362..e6b443b 100644
--- a/src/Engine/Parameter/Template.cpp
+++ b/src/Engine/Parameter/Template.cpp
@@ -2,31 +2,43 @@
 #include "Engine/Parameter/Default.h"
 #include "Engine/Parameter/Range.h"
 #include "Engine/Parameter/Type.h"
+#include <icecream.hpp>
 
 enzo::prm::Template::Template(enzo::prm::Type type, const char* name)
 : Template(type, name, prm::Default())
 {
-
+    ranges_.resize(vectorSize_);
 }
 
 enzo::prm::Template::Template(enzo::prm::Type type, const char* name, unsigned int vectorSize)
 : Template(type, name, prm::Default(), vectorSize)
 {
-
+    ranges_.resize(vectorSize_);
 }
 
 enzo::prm::Template::Template(enzo::prm::Type type, const char* name, std::vector<prm::Default> defaults, unsigned int vectorSize, std::vector<prm::Range> ranges)
 : type_{type}, name_{name}, defaults_{defaults}, vectorSize_(vectorSize)
 {
-    ranges.resize(vectorSize);
+    if(ranges.size()<vectorSize_)
+    {
+        if(ranges.size()>=1)
+        {
+            ranges.resize(vectorSize_, ranges[0]);
+        }
+        else
+        {
+            ranges.resize(vectorSize_);
+        }
+
+    }
     ranges_ = ranges;
 }
 
 enzo::prm::Template::Template(enzo::prm::Type type, const char* name, prm::Default theDefault, unsigned int vectorSize, Range range)
 : type_{type}, name_{name}, vectorSize_(vectorSize)
 {
-    defaults_.push_back(theDefault);
-    ranges_.push_back(range);
+    defaults_.resize(vectorSize_, theDefault);
+    ranges_.resize(vectorSize_, range);
 }
 
 enzo::prm::Template::Template()
diff --git a/src/Gui/Parameters/FloatSliderParm.cpp b/src/Gui/Parameters/FloatSliderParm.cpp
index e5334af..1156431 100644
--- a/src/Gui/Parameters/FloatSliderParm.cpp
+++ b/src/Gui/Parameters/FloatSliderParm.cpp
@@ -38,7 +38,7 @@ enzo::ui::FloatSliderParm::FloatSliderParm(std::weak_ptr<prm::Parameter> paramet
 
     if(auto parameterShared=parameter_.lock())
     {
-        auto range = parameterShared->getTemplate().getRange();
+        auto range = parameterShared->getTemplate().getRange(vectorIndex);
         minValue_=range.getMin();
         maxValue_=range.getMax();
         clampMin_=range.getMinFlag()==prm::RangeFlag::LOCKED;
@@ -59,7 +59,7 @@ void enzo::ui::FloatSliderParm::paintEvent(QPaintEvent *event)
     painter.setBrush(QColor("#383838"));
 
     const int valueRange = maxValue_-minValue_;
-    float fillPercent = std::min<float>(static_cast<float>(value_-minValue_)/valueRange, 1);
+    float fillPercent = std::clamp<float>(static_cast<float>(value_-minValue_)/valueRange, 0, 1);
 
     constexpr float margin = 3;
     float fillWidth = rect().width()-margin*2;
diff --git a/src/Gui/Parameters/FormParm.cpp b/src/Gui/Parameters/FormParm.cpp
index c11dece..8e00a48 100644
--- a/src/Gui/Parameters/FormParm.cpp
+++ b/src/Gui/Parameters/FormParm.cpp
@@ -42,17 +42,16 @@ enzo::ui::FormParm::FormParm(std::weak_ptr<prm::Parameter> parameter)
             }
             case prm::Type::XYZ:
             {
-                FloatSliderParm* slider1 = new FloatSliderParm(parameter, 0);
-                FloatSliderParm* slider2 = new FloatSliderParm(parameter, 0);
-                FloatSliderParm* slider3 = new FloatSliderParm(parameter, 0);
+                const unsigned int vectorSize = sharedParameter->getVectorSize();
                 QHBoxLayout* vectorLayout = new QHBoxLayout();
-                vectorLayout->addWidget(slider1);
-                vectorLayout->addWidget(slider2);
-                vectorLayout->addWidget(slider3);
+                for(int i=0; i<vectorSize; i++)
+                {
+                    FloatSliderParm* slider = new FloatSliderParm(parameter, i);
+                    vectorLayout->addWidget(slider);
+                    connect(slider, &FloatSliderParm::valueChanged, this, [this, i](bt::floatT value){this->changeValue(value, i);}); 
+
+                }
                 mainLayout_->addLayout(vectorLayout);
-                connect(slider1, &FloatSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 0);}); 
-                connect(slider2, &FloatSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 1);}); 
-                connect(slider3, &FloatSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 2);}); 
                 break;
             }
             case prm::Type::STRING:
diff --git a/src/Gui/Parameters/IntSliderParm.cpp b/src/Gui/Parameters/IntSliderParm.cpp
index 21e5739..d3c2934 100644
--- a/src/Gui/Parameters/IntSliderParm.cpp
+++ b/src/Gui/Parameters/IntSliderParm.cpp
@@ -61,8 +61,7 @@ void enzo::ui::IntSliderParm::paintEvent(QPaintEvent *event)
     painter.setRenderHint(QPainter::Antialiasing, true);
 
     const int valueRange = maxValue_-minValue_;
-    float fillPercent = std::min<float>(static_cast<float>(value_-minValue_)/valueRange, 1);
-    IC(value_, fillPercent);
+    float fillPercent = std::clamp<float>(static_cast<float>(value_-minValue_)/valueRange, 0, 1);
     float margin = 3;
     float fillWidth = rect().width()-margin*2;
     fillWidth *= fillPercent;
diff --git a/src/OpDefs/GopGrid.cpp b/src/OpDefs/GopGrid.cpp
index 01d2a51..37da484 100644
--- a/src/OpDefs/GopGrid.cpp
+++ b/src/OpDefs/GopGrid.cpp
@@ -21,8 +21,8 @@ void GopGrid::cookOp(enzo::op::Context context)
     if(outputRequested(0))
     {
         geo::Geometry geo;
-        bt::floatT width = context.evalFloatParm("width");
-        bt::floatT height = context.evalFloatParm("height");
+        bt::floatT width = context.evalFloatParm("size", 0);
+        bt::floatT height = context.evalFloatParm("size", 1);
 
         const bt::intT columns = context.evalFloatParm("columns");
         const bt::intT rows = context.evalFloatParm("rows");
@@ -74,8 +74,7 @@ void GopGrid::cookOp(enzo::op::Context context)
 
 enzo::prm::Template GopGrid::parameterList[] =
 {
-    enzo::prm::Template(enzo::prm::Type::FLOAT, "width", enzo::prm::Default(10), 1, enzo::prm::Range(0, enzo::prm::RangeFlag::UNLOCKED, 100, enzo::prm::RangeFlag::UNLOCKED)),
-    enzo::prm::Template(enzo::prm::Type::FLOAT, "height", enzo::prm::Default(10), 1, enzo::prm::Range(0, enzo::prm::RangeFlag::UNLOCKED, 100, enzo::prm::RangeFlag::UNLOCKED)),
+    enzo::prm::Template(enzo::prm::Type::XYZ, "size", enzo::prm::Default(10), 2, enzo::prm::Range(0, enzo::prm::RangeFlag::UNLOCKED, 100, enzo::prm::RangeFlag::UNLOCKED)),
     enzo::prm::Template(
         enzo::prm::Type::INT,
         "rows",