fixed a problem with the lastDrawMode not being initialized when picking

renderer is used at startup. fixes #1

ObjectTypes/VolumeMeshObject/VolumeMeshNodeT.cc

@@ -1109,6 +1109,12 @@ void VolumeMeshNodeT<VolumeMeshT>::getRenderObjects(IRenderer* _renderer, GLStat
 
 template<class VolumeMeshT>
 void VolumeMeshNodeT<VolumeMeshT>::pick(GLState& _state, PickTarget _target) {
+    bool drawModeOverride = false;
+    if(lastDrawMode_ == DrawModes::NONE)  // no last drawmode so the picking renderer
+    {                                     // is probably calling this function for rendering
+      lastDrawMode_ = drawMode();
+      drawModeOverride = true;
+    }
 
     // save state
     bool clientStateEnabledVertexArray   = GLState::isClientStateEnabled(GL_VERTEX_ARRAY);
@@ -1215,6 +1221,9 @@ void VolumeMeshNodeT<VolumeMeshT>::pick(GLState& _state, PickTarget _target) {
 
     lastPickTarget_ = _target;
 
+    if(drawModeOverride)
+      lastDrawMode_ = DrawModes::NONE;
+
     // restore state
     if (clientStateEnabledVertexArray)
         GLState::enableClientState(GL_VERTEX_ARRAY);