diff --git a/lightpreview/glview.cpp b/lightpreview/glview.cpp
index a9458a8e..e42c37cb 100644
--- a/lightpreview/glview.cpp
+++ b/lightpreview/glview.cpp
@@ -356,6 +356,10 @@ void GLView::updateFaceVisibility()
     int leafnum = leaf - bsp.dleafs.data();
     int clusternum = leaf->cluster;
 
+    if (!m_visCulling) {
+        clusternum = -1;
+    }
+
     if (m_lastLeaf == clusternum) {
         qDebug() << "reusing last frame visdata for leaf " << leafnum << " cluster " << clusternum;
         return;
@@ -367,7 +371,7 @@ void GLView::updateFaceVisibility()
     if (it == m_decompressedVis.end()) {
         qDebug() << "no visdata, must be in void";
 
-        m_lastLeaf = clusternum;
+        m_lastLeaf = -1;
         setFaceVisibilityToAllVisible();
 
         return;
@@ -761,6 +765,12 @@ void GLView::setShowTrisSeeThrough(bool showtris)
     update();
 }
 
+void GLView::setVisCulling(bool viscull)
+{
+    m_visCulling = viscull;
+    update();
+}
+
 void GLView::setDrawFlat(bool drawflat)
 {
     m_drawFlat = drawflat;
diff --git a/lightpreview/glview.h b/lightpreview/glview.h
index 9e1c6e1d..a2b6d98a 100644
--- a/lightpreview/glview.h
+++ b/lightpreview/glview.h
@@ -72,6 +72,7 @@ private:
      * -1 indicates solid leaf or no visdata (render all)
      */
     int m_lastLeaf = -1;
+    bool m_visCulling = true;
 
     // camera stuff
     float m_displayAspect;
@@ -197,6 +198,7 @@ public:
     void setDrawNormals(bool drawnormals);
     void setShowTris(bool showtris);
     void setShowTrisSeeThrough(bool showtris);
+    void setVisCulling(bool viscull);
     void setDrawFlat(bool drawflat);
     void setKeepOrigin(bool keeporigin);
     void setDrawPortals(bool drawportals);
diff --git a/lightpreview/mainwindow.cpp b/lightpreview/mainwindow.cpp
index d5422e3f..8fb6d0a2 100644
--- a/lightpreview/mainwindow.cpp
+++ b/lightpreview/mainwindow.cpp
@@ -173,6 +173,8 @@ void MainWindow::createPropertiesSidebar()
 
     auto *showtris = new QCheckBox(tr("Show Tris"));
     auto *showtris_seethrough = new QCheckBox(tr("Show Tris (See Through)"));
+    auto *visculling = new QCheckBox(tr("Vis Culling"));
+    visculling->setChecked(true);
 
     auto *keepposition = new QCheckBox(tr("Keep Camera Pos"));
 
@@ -193,6 +195,7 @@ void MainWindow::createPropertiesSidebar()
     formLayout->addRow(drawleak);
     formLayout->addRow(showtris);
     formLayout->addRow(showtris_seethrough);
+    formLayout->addRow(visculling);
     formLayout->addRow(keepposition);
     formLayout->addRow(nearest);
     formLayout->addRow(bspx_decoupled_lm);
@@ -240,6 +243,7 @@ void MainWindow::createPropertiesSidebar()
     connect(showtris, &QAbstractButton::toggled, this, [=](bool checked) { glView->setShowTris(checked); });
     connect(showtris_seethrough, &QAbstractButton::toggled, this,
         [=](bool checked) { glView->setShowTrisSeeThrough(checked); });
+    connect(visculling, &QAbstractButton::toggled, this, [=](bool checked) { glView->setVisCulling(checked); });
     connect(drawflat, &QAbstractButton::toggled, this, [=](bool checked) { glView->setDrawFlat(checked); });
     connect(drawportals, &QAbstractButton::toggled, this, [=](bool checked) { glView->setDrawPortals(checked); });
     connect(drawleak, &QAbstractButton::toggled, this, [=](bool checked) { glView->setDrawLeak(checked); });