diff --git a/CMakeLists.txt b/CMakeLists.txt
index f151d34..fb6d7f8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,9 +51,9 @@ set(GUI_SOURCES
     src/Gui/Network/NodeIconGraphic.cpp
     src/Gui/Network/TabMenu.cpp
     src/Gui/ParametersPanel/ParametersPanel.cpp
-    src/Gui/Parameters/AbstractSliderParm.cpp
-    src/Gui/Parameters/AbstractFormParm.cpp
-    src/Gui/Parameters/FloatParm.cpp
+    src/Gui/Parameters/FloatSliderParm.cpp
+    src/Gui/Parameters/IntSliderParm.cpp
+    src/Gui/Parameters/FormParm.cpp
     src/Gui/Parameters/StringParm.cpp
 )
 set(ENGINE_INCLUDE_DIRECTORIES
diff --git a/src/Engine/Parameter/Parameter.cpp b/src/Engine/Parameter/Parameter.cpp
index 6a34501..5fd69ec 100644
--- a/src/Engine/Parameter/Parameter.cpp
+++ b/src/Engine/Parameter/Parameter.cpp
@@ -9,18 +9,18 @@
 enzo::prm::Parameter::Parameter(Template prmTemplate)
 : template_{prmTemplate}
 {
-    floatValues_ = std::vector<bt::floatT>();
-    floatValues_.reserve(prmTemplate.getSize());
-
-    stringValues_ = std::vector<bt::String>(prmTemplate.getSize(), prmTemplate.getDefault().getString());
-    stringValues_.reserve(prmTemplate.getSize());
-
     const unsigned int templateSize = prmTemplate.getSize();
     const unsigned int numDefaults = prmTemplate.getNumDefaults();
 
+    floatValues_.reserve(templateSize);
+    stringValues_.reserve(templateSize);
+    intValues_.reserve(templateSize);
+
+
     if(numDefaults==1)
     {
         floatValues_ = std::vector<bt::floatT>(templateSize, prmTemplate.getDefault().getFloat());
+        intValues_ = std::vector<bt::intT>(templateSize, prmTemplate.getDefault().getInt());
         stringValues_ = std::vector<bt::String>(templateSize, prmTemplate.getDefault().getString());
     }
 
@@ -33,6 +33,7 @@ enzo::prm::Parameter::Parameter(Template prmTemplate)
         }
         floatValues_.push_back(prmDefault.getFloat());
         stringValues_.push_back(prmDefault.getString());
+        intValues_.push_back(prmDefault.getInt());
     }
 
 
@@ -51,6 +52,13 @@ enzo::bt::floatT enzo::prm::Parameter::evalFloat(unsigned int index) const
     return floatValues_[index];
 }
 
+enzo::bt::intT enzo::prm::Parameter::evalInt(unsigned int index) const
+{
+    if(index >= intValues_.size())
+        throw std::out_of_range("Cannot access index: " + std::to_string(index) + " for parameter: " + getName());
+    return intValues_[index];
+}
+
 enzo::bt::String enzo::prm::Parameter::evalString(unsigned int index) const
 {
     if(index >= stringValues_.size())
@@ -66,6 +74,14 @@ enzo::prm::Type enzo::prm::Parameter::getType() const
 }
 
 
+void enzo::prm::Parameter::setInt(bt::intT value, unsigned int index)
+{
+    if(index >= intValues_.size())
+        throw std::out_of_range("Cannot access index: " + std::to_string(index) + " for parameter: " + getName());
+    intValues_[index] = value;
+    valueChanged();
+}
+
 void enzo::prm::Parameter::setFloat(bt::floatT value, unsigned int index)
 {
     if(index >= floatValues_.size())
diff --git a/src/Engine/Parameter/Parameter.h b/src/Engine/Parameter/Parameter.h
index ec25093..29b055d 100644
--- a/src/Engine/Parameter/Parameter.h
+++ b/src/Engine/Parameter/Parameter.h
@@ -14,7 +14,9 @@ public:
 
     bt::floatT evalFloat(unsigned int index=0) const;
     bt::String evalString(unsigned int index=0) const;
+    bt::intT evalInt(unsigned int index=0) const;
     
+    void setInt(bt::intT value, unsigned int index=0);
     void setFloat(bt::floatT value, unsigned int index=0);
     void setString(bt::String value, unsigned int index=0);
 
@@ -23,6 +25,7 @@ private:
     Template template_;
     std::vector<bt::floatT> floatValues_;
     std::vector<bt::String> stringValues_;
+    std::vector<bt::intT> intValues_;
 
 };
 }
diff --git a/src/Gui/Parameters/FloatParm.cpp b/src/Gui/Parameters/FloatParm.cpp
deleted file mode 100644
index 476c7fa..0000000
--- a/src/Gui/Parameters/FloatParm.cpp
+++ /dev/null
@@ -1,3 +0,0 @@
-#include "Gui/Parameters/FloatParm.h"
-
-
diff --git a/src/Gui/Parameters/FloatParm.h b/src/Gui/Parameters/FloatParm.h
deleted file mode 100644
index 64e513f..0000000
--- a/src/Gui/Parameters/FloatParm.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#include "Gui/Parameters/AbstractSliderParm.h"
-
-namespace enzo::ui
-{
-
-class FloatParm
-: public AbstractSliderParm
-{
-    using AbstractSliderParm = AbstractSliderParm;
-
-};
-
-}
diff --git a/src/Gui/Parameters/AbstractSliderParm.cpp b/src/Gui/Parameters/FloatSliderParm.cpp
similarity index 55%
rename from src/Gui/Parameters/AbstractSliderParm.cpp
rename to src/Gui/Parameters/FloatSliderParm.cpp
index 8405193..a039c89 100644
--- a/src/Gui/Parameters/AbstractSliderParm.cpp
+++ b/src/Gui/Parameters/FloatSliderParm.cpp
@@ -1,4 +1,4 @@
-#include "Gui/Parameters/AbstractSliderParm.h"
+#include "Gui/Parameters/FloatSliderParm.h"
 #include "Engine/Types.h"
 #include <QPainter>
 #include <QPaintEvent>
@@ -10,7 +10,7 @@
 #include <string>
 
 
-enzo::ui::AbstractSliderParm::AbstractSliderParm(bt::floatT value, QWidget *parent, Qt::WindowFlags f)
+enzo::ui::FloatSliderParm::FloatSliderParm(bt::floatT value, QWidget *parent, Qt::WindowFlags f)
 : QWidget(parent, f)
 {
     // tells qt to style the widget even though it's a Q_OBJECT
@@ -37,23 +37,26 @@ enzo::ui::AbstractSliderParm::AbstractSliderParm(bt::floatT value, QWidget *pare
     setValueImpl(value);
 }
 
-void enzo::ui::AbstractSliderParm::paintEvent(QPaintEvent *event)
+void enzo::ui::FloatSliderParm::paintEvent(QPaintEvent *event)
 {
     QPainter painter(this);
     painter.setRenderHint(QPainter::Antialiasing, true);
     painter.setPen(Qt::NoPen);
     painter.setBrush(QColor("#383838"));
 
-    QRectF fillRect = event->rect();
-    float fillPercent = value_/maxValue_;
-    std::cout << "fill percent" << fillPercent << "\n";
-    float margin = 3;
-    fillRect.adjust(margin, margin, std::max<float>(-fillRect.width()+margin, -fillRect.width()*(1-fillPercent)-margin), -margin);
+    const int valueRange = maxValue_-minValue_;
+    float fillPercent = static_cast<float>(value_-minValue_)/valueRange;
+
+    constexpr float margin = 3;
+    float fillWidth = rect().width()-margin*2;
+    fillWidth *= fillPercent;
+
+    QRectF fillRect = {rect().left()+margin, rect().top()+margin, fillWidth, rect().height()-margin*2};
     painter.drawRoundedRect(fillRect, 6, 6);
 
 }
 
-void enzo::ui::AbstractSliderParm::setValueImpl(bt::floatT value)
+void enzo::ui::FloatSliderParm::setValueImpl(bt::floatT value)
 {
     if(clampMin_ && value<minValue_) { value = minValue_; }
     if(clampMax_ && value>maxValue_) { value = maxValue_; }
@@ -66,7 +69,7 @@ void enzo::ui::AbstractSliderParm::setValueImpl(bt::floatT value)
 
 }
 
-void enzo::ui::AbstractSliderParm::setValue(bt::floatT value)
+void enzo::ui::FloatSliderParm::setValue(bt::floatT value)
 {
 
     setValueImpl(value);
@@ -76,13 +79,21 @@ void enzo::ui::AbstractSliderParm::setValue(bt::floatT value)
 }
 
 
-void enzo::ui::AbstractSliderParm::mouseMoveEvent(QMouseEvent *event)
+void enzo::ui::FloatSliderParm::mouseMoveEvent(QMouseEvent *event)
 {
-    setValue(static_cast<float>(event->pos().x())/rect().width() * maxValue_);
+    // normalized
+    float value = static_cast<float>(event->pos().x())/rect().width();
+    //remap
+    value = minValue_+(maxValue_-minValue_)*value;
+    setValue(value);
 }
 
-void enzo::ui::AbstractSliderParm::mousePressEvent(QMouseEvent *event)
+void enzo::ui::FloatSliderParm::mousePressEvent(QMouseEvent *event)
 {
-    setValue(static_cast<float>(event->pos().x())/rect().width() * maxValue_);
+    // normalized
+    float value = static_cast<float>(event->pos().x())/rect().width();
+    //remap
+    value = minValue_+(maxValue_-minValue_)*value;
+    setValue(value);
 }
 
diff --git a/src/Gui/Parameters/AbstractSliderParm.h b/src/Gui/Parameters/FloatSliderParm.h
similarity index 83%
rename from src/Gui/Parameters/AbstractSliderParm.h
rename to src/Gui/Parameters/FloatSliderParm.h
index 097c4b3..f6c9691 100644
--- a/src/Gui/Parameters/AbstractSliderParm.h
+++ b/src/Gui/Parameters/FloatSliderParm.h
@@ -7,12 +7,12 @@
 namespace enzo::ui
 {
 
-class AbstractSliderParm
+class FloatSliderParm
 : public QWidget
 {
     Q_OBJECT
 public:
-    AbstractSliderParm(bt::floatT value, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+    FloatSliderParm(bt::floatT value, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
     void setValue(bt::floatT value);
 
 Q_SIGNALS:
diff --git a/src/Gui/Parameters/AbstractFormParm.cpp b/src/Gui/Parameters/FormParm.cpp
similarity index 54%
rename from src/Gui/Parameters/AbstractFormParm.cpp
rename to src/Gui/Parameters/FormParm.cpp
index dd16549..164a482 100644
--- a/src/Gui/Parameters/AbstractFormParm.cpp
+++ b/src/Gui/Parameters/FormParm.cpp
@@ -1,6 +1,7 @@
-#include "Gui/Parameters/AbstractFormParm.h"
+#include "Gui/Parameters/FormParm.h"
+#include "Gui/Parameters/IntSliderParm.h"
 #include "Engine/Types.h"
-#include "Gui/Parameters/AbstractSliderParm.h"
+#include "Gui/Parameters/FloatSliderParm.h"
 #include "Gui/Parameters/StringParm.h"
 #include <qboxlayout.h>
 #include <QLabel>
@@ -9,7 +10,7 @@
 #include <string>
 
 
-enzo::ui::AbstractFormParm::AbstractFormParm(std::weak_ptr<prm::Parameter> parameter)
+enzo::ui::FormParm::FormParm(std::weak_ptr<prm::Parameter> parameter)
 : parameter_{parameter}
 {
     if(auto sharedParameter=parameter_.lock())
@@ -27,25 +28,31 @@ enzo::ui::AbstractFormParm::AbstractFormParm(std::weak_ptr<prm::Parameter> param
         {
             case prm::Type::FLOAT:
             {
-                AbstractSliderParm* slider;
-                slider = new AbstractSliderParm(sharedParameter->evalFloat());
+                FloatSliderParm* slider = new FloatSliderParm(sharedParameter->evalFloat());
                 mainLayout_->addWidget(slider);
-                connect(slider, &AbstractSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 0);}); 
+                connect(slider, &FloatSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 0);}); 
+                break;
+            }
+            case prm::Type::INT:
+            {
+                IntSliderParm* slider = new IntSliderParm(sharedParameter->evalInt());
+                mainLayout_->addWidget(slider);
+                connect(slider, &IntSliderParm::valueChanged, this, [this](bt::intT value){this->changeValue(value, 0);}); 
                 break;
             }
             case prm::Type::XYZ:
             {
-                AbstractSliderParm* slider1 = new AbstractSliderParm(sharedParameter->evalFloat(0));
-                AbstractSliderParm* slider2 = new AbstractSliderParm(sharedParameter->evalFloat(1));
-                AbstractSliderParm* slider3 = new AbstractSliderParm(sharedParameter->evalFloat(2));
+                FloatSliderParm* slider1 = new FloatSliderParm(sharedParameter->evalFloat(0));
+                FloatSliderParm* slider2 = new FloatSliderParm(sharedParameter->evalFloat(1));
+                FloatSliderParm* slider3 = new FloatSliderParm(sharedParameter->evalFloat(2));
                 QHBoxLayout* vectorLayout = new QHBoxLayout();
                 vectorLayout->addWidget(slider1);
                 vectorLayout->addWidget(slider2);
                 vectorLayout->addWidget(slider3);
                 mainLayout_->addLayout(vectorLayout);
-                connect(slider1, &AbstractSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 0);}); 
-                connect(slider2, &AbstractSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 1);}); 
-                connect(slider3, &AbstractSliderParm::valueChanged, this, [this](bt::floatT value){this->changeValue(value, 2);}); 
+                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:
@@ -61,7 +68,7 @@ enzo::ui::AbstractFormParm::AbstractFormParm(std::weak_ptr<prm::Parameter> param
 
             }
             default:
-                throw std::runtime_error("Parameter panel: paremeter type not accounted for " + std::to_string(static_cast<int>(sharedParameter->getType())));
+                throw std::runtime_error("Form parm: paremeter type not accounted for " + std::to_string(static_cast<int>(sharedParameter->getType())));
 
         }
 
@@ -77,20 +84,20 @@ enzo::ui::AbstractFormParm::AbstractFormParm(std::weak_ptr<prm::Parameter> param
 
 }
 
-int enzo::ui::AbstractFormParm::getLeftPadding()
+int enzo::ui::FormParm::getLeftPadding()
 {
 
     return label_->minimumSizeHint().width();
 }
 
-void enzo::ui::AbstractFormParm::setLeftPadding(int padding)
+void enzo::ui::FormParm::setLeftPadding(int padding)
 {
     label_->setFixedWidth(padding);
 }
 
 
 
-void enzo::ui::AbstractFormParm::changeValue(enzo::bt::floatT value, unsigned int index)
+void enzo::ui::FormParm::changeValue(enzo::bt::floatT value, unsigned int index)
 {
     if(auto sharedParameter=parameter_.lock())
     {
@@ -104,7 +111,7 @@ void enzo::ui::AbstractFormParm::changeValue(enzo::bt::floatT value, unsigned in
      
 }
 
-void enzo::ui::AbstractFormParm::changeValue(enzo::bt::String value, unsigned int index)
+void enzo::ui::FormParm::changeValue(enzo::bt::String value, unsigned int index)
 {
     if(auto sharedParameter=parameter_.lock())
     {
diff --git a/src/Gui/Parameters/AbstractFormParm.h b/src/Gui/Parameters/FormParm.h
similarity index 85%
rename from src/Gui/Parameters/AbstractFormParm.h
rename to src/Gui/Parameters/FormParm.h
index 2f33178..5cf489a 100644
--- a/src/Gui/Parameters/AbstractFormParm.h
+++ b/src/Gui/Parameters/FormParm.h
@@ -8,12 +8,12 @@
 namespace enzo::ui
 {
 
-class AbstractFormParm
+class FormParm
 : public QWidget
 {
     Q_OBJECT
 public:
-    AbstractFormParm(std::weak_ptr<prm::Parameter> parameter);
+    FormParm(std::weak_ptr<prm::Parameter> parameter);
     int getLeftPadding();
     void setLeftPadding(int padding);
 
diff --git a/src/Gui/Parameters/IntSliderParm.cpp b/src/Gui/Parameters/IntSliderParm.cpp
new file mode 100644
index 0000000..865dc4e
--- /dev/null
+++ b/src/Gui/Parameters/IntSliderParm.cpp
@@ -0,0 +1,117 @@
+#include "Gui/Parameters/IntSliderParm.h"
+#include "Engine/Types.h"
+#include <QPainter>
+#include <QPaintEvent>
+#include <QLabel>
+#include <cmath>
+#include <iostream>
+#include <qboxlayout.h>
+#include <qnamespace.h>
+#include <algorithm>
+#include <string>
+#include <icecream.hpp>
+
+
+enzo::ui::IntSliderParm::IntSliderParm(bt::intT value, QWidget *parent, Qt::WindowFlags f)
+: QWidget(parent, f)
+{
+    // tells qt to style the widget even though it's a Q_OBJECT
+    setAttribute(Qt::WA_StyledBackground, true);
+    setFixedHeight(24);
+
+    notchPen_ = QPen(QColor("#383838"), notchWidth, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
+
+
+    
+    mainLayout_ = new QVBoxLayout();
+    setLayout(mainLayout_);
+
+    valueLabel_ = new QLabel();
+    valueLabel_->setAlignment(Qt::AlignCenter);
+    valueLabel_->setStyleSheet("background-color: none;");
+    setProperty("type", "SliderParm");
+    setStyleSheet(R"(
+                  QWidget[type="SliderParm"]
+                  {
+                      border-radius: 6px;
+                      border: 1px solid #383838;
+                  }
+                  )");
+    mainLayout_->addWidget(valueLabel_);
+
+    setValueImpl(value);
+}
+
+void enzo::ui::IntSliderParm::paintEvent(QPaintEvent *event)
+{
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing, true);
+
+    const int valueRange = maxValue_-minValue_;
+    float fillPercent = static_cast<float>(value_-minValue_)/valueRange;
+    IC(value_, fillPercent);
+    float margin = 3;
+    float fillWidth = rect().width()-margin*2;
+    fillWidth *= fillPercent;
+
+    QRectF fillRect = {rect().left()+margin, rect().top()+margin, fillWidth, rect().height()-margin*2};
+
+    painter.setPen(notchPen_);
+    QRectF markerLinesRect = rect();
+    markerLinesRect.adjust(margin, margin, -margin, -margin);
+    for(int i=minValue_+1;i<maxValue_; ++i)
+    {
+        float x = ((i-minValue_)*markerLinesRect.width())/valueRange;
+        x += notchWidth+4; // offset
+        const float y = markerLinesRect.bottom()-2;
+        painter.drawLine(x, y, x, y-5);
+
+    }
+
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(QColor("#383838"));
+    painter.drawRoundedRect(fillRect, 6, 6);
+
+}
+
+void enzo::ui::IntSliderParm::setValueImpl(bt::intT value)
+{
+    if(clampMin_ && value<minValue_) { value = minValue_; }
+    if(clampMax_ && value>maxValue_) { value = maxValue_; }
+
+    value_ = value;
+    QString valStr = QString::number(value_);
+    valStr.truncate(4);
+    valueLabel_->setText(valStr);
+
+
+}
+
+void enzo::ui::IntSliderParm::setValue(bt::intT value)
+{
+
+    setValueImpl(value);
+    update();
+    valueChanged(value_);
+
+}
+
+
+void enzo::ui::IntSliderParm::mouseMoveEvent(QMouseEvent *event)
+{
+    // normalized
+    float value = static_cast<float>(event->pos().x())/rect().width();
+    //remap
+    value = minValue_+(maxValue_-minValue_)*value;
+    setValue(rint(value));
+}
+
+void enzo::ui::IntSliderParm::mousePressEvent(QMouseEvent *event)
+{
+    // normalized
+    float value = static_cast<float>(event->pos().x())/rect().width();
+    //remap
+    value = minValue_+(maxValue_-minValue_)*value;
+    setValue(rint(value));
+}
+
diff --git a/src/Gui/Parameters/IntSliderParm.h b/src/Gui/Parameters/IntSliderParm.h
new file mode 100644
index 0000000..60f4297
--- /dev/null
+++ b/src/Gui/Parameters/IntSliderParm.h
@@ -0,0 +1,45 @@
+#pragma once
+#include "Engine/Types.h"
+#include <QWidget>
+#include <QVBoxLayout>
+#include <QLabel>
+#include <QPen>
+
+namespace enzo::ui
+{
+
+class IntSliderParm
+: public QWidget
+{
+    Q_OBJECT
+public:
+    IntSliderParm(bt::intT value, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+    void setValue(bt::intT value);
+
+Q_SIGNALS:
+    void valueChanged(bt::intT value); 
+
+private:
+
+    QVBoxLayout* mainLayout_;
+    QLabel* valueLabel_;
+    bt::intT value_;
+    bool clampMin_ = true;
+    bool clampMax_ = true;
+    bt::intT minValue_=-5;
+    bt::intT maxValue_=10;
+
+    QPen notchPen_;
+    static constexpr int notchWidth = 2;
+
+    void setValueImpl(bt::intT value);
+
+protected:
+void paintEvent(QPaintEvent *event) override;
+void mouseMoveEvent(QMouseEvent *event) override;
+void mousePressEvent(QMouseEvent *event) override;
+
+};
+
+}
+
diff --git a/src/Gui/ParametersPanel/ParametersPanel.cpp b/src/Gui/ParametersPanel/ParametersPanel.cpp
index 518a939..db592a6 100644
--- a/src/Gui/ParametersPanel/ParametersPanel.cpp
+++ b/src/Gui/ParametersPanel/ParametersPanel.cpp
@@ -1,9 +1,8 @@
 #include "Gui/ParametersPanel/ParametersPanel.h"
 #include "Engine/Operator/GeometryOperator.h"
 #include "Engine/Types.h"
-#include "Gui/Parameters/AbstractSliderParm.h"
-#include "Gui/Parameters/AbstractFormParm.h"
-#include "Gui/Parameters/FloatParm.h"
+#include "Gui/Parameters/FloatSliderParm.h"
+#include "Gui/Parameters/FormParm.h"
 #include "Engine/Network/NetworkManager.h"
 #include <memory>
 #include <qboxlayout.h>
@@ -52,7 +51,7 @@ void ParametersPanel::selectionChanged(enzo::nt::OpId opId)
     enzo::nt::GeometryOperator& displayOp = nm.getGeoOperator(displayOpId);
     auto parameters = displayOp.getParameters();
 
-    std::vector<enzo::ui::AbstractFormParm*> parameterWidgets;
+    std::vector<enzo::ui::FormParm*> parameterWidgets;
     parameterWidgets.reserve(parameters.size());
 
     int maxLeftPadding = 0;
@@ -62,7 +61,7 @@ void ParametersPanel::selectionChanged(enzo::nt::OpId opId)
         auto parameterShared = parameter.lock();
         if(!parameterShared) throw std::runtime_error("Failed to lock parameter");
 
-        enzo::ui::AbstractFormParm* parameterWidget = new enzo::ui::AbstractFormParm(parameter);
+        enzo::ui::FormParm* parameterWidget = new enzo::ui::FormParm(parameter);
         int leftPadding = parameterWidget->getLeftPadding();
         if(leftPadding > maxLeftPadding) maxLeftPadding = leftPadding;
 
diff --git a/src/OpDefs/GopGrid.cpp b/src/OpDefs/GopGrid.cpp
index 3fdfe7b..8044fbc 100644
--- a/src/OpDefs/GopGrid.cpp
+++ b/src/OpDefs/GopGrid.cpp
@@ -59,7 +59,7 @@ enzo::prm::Template GopGrid::parameterList[] =
 {
     enzo::prm::Template(enzo::prm::Type::FLOAT, "width", enzo::prm::Default(1)),
     enzo::prm::Template(enzo::prm::Type::FLOAT, "height", enzo::prm::Default(1)),
-    enzo::prm::Template(enzo::prm::Type::FLOAT, "rows", enzo::prm::Default(10)),
-    enzo::prm::Template(enzo::prm::Type::FLOAT, "columns", enzo::prm::Default(10)),
+    enzo::prm::Template(enzo::prm::Type::INT, "rows", enzo::prm::Default(10)),
+    enzo::prm::Template(enzo::prm::Type::INT, "columns", enzo::prm::Default(10)),
     enzo::prm::Terminator
 };