Fix to make sure index in 64bit to avoid integer overflow

Author: ChangLi27

src/Widgets/VolumeViewerWidget.cpp

@@ -37,7 +37,7 @@ void VolumeViewerWidget::setData(Dataset<Points> pointDataset)
     {
     case VolumeViewerPlugin::RendererBackend::OpenGL:
     {
-        int numDimensions = pointDataset->getNumDimensions();
+        std::uint64_t numDimensions = pointDataset->getNumDimensions();
         if (numDimensions != 3) {
             qDebug() << "WARNING: DIMENSIONS ARE NOT 3";
             return;
@@ -48,7 +48,7 @@ void VolumeViewerWidget::setData(Dataset<Points> pointDataset)
         QVector3D minCoord(std::numeric_limits<float>::max(), std::numeric_limits<float>::max(), std::numeric_limits<float>::max());
         QVector3D maxCoord(-std::numeric_limits<float>::max(), -std::numeric_limits<float>::max(), -std::numeric_limits<float>::max());
         _meanCoord = QVector3D(0, 0, 0);
-        for (int i = 0; i < pointDataset->getNumPoints(); i++)
+        for (std::uint64_t i = 0; i < pointDataset->getNumPoints(); i++)
         {
             float x = pointDataset->getValueAt(i * numDimensions + 0);
             float y = pointDataset->getValueAt(i * numDimensions + 1);
@@ -67,7 +67,7 @@ void VolumeViewerWidget::setData(Dataset<Points> pointDataset)
         _maxRange = std::max(range.x(), std::max(range.y(), range.z()));
 
         // Rescale data
-        for (int i = 0; i < pointDataset->getNumPoints(); i++)
+        for (std::uint64_t i = 0; i < pointDataset->getNumPoints(); i++)
         {
             float x = pointDataset->getValueAt(i * numDimensions + 0);
             float y = pointDataset->getValueAt(i * numDimensions + 1);
@@ -132,12 +132,12 @@ void VolumeViewerWidget::requestSelection(const QVector3D& cursor, bool replaces
 std::vector<float> VolumeViewerWidget::getPointDistances(const QVector3D& cursor) const {
 
     auto dataset = _plugin->getDataset();
-    int numDimensions = dataset->getNumDimensions();
+    std::uint64_t numDimensions = dataset->getNumDimensions();
 
 
     std::vector<float> result = std::vector<float>(points.size() / 3, 0.0f);
 
-    for (std::uint32_t localIndex = 0; localIndex < points.size() / numDimensions; localIndex++) {
+    for (std::uint64_t localIndex = 0; localIndex < points.size() / numDimensions; localIndex++) {
 
         result[localIndex] = std::sqrt(
             std::pow(cursor[0] - points[localIndex * numDimensions + 0], 2)