How to invalidate render items

[sukoy27k]

Hi

Regarding the render items in nitrous

https://help.autodesk.com/view/3DSMAX/2020/ENU/?guid=__developer_3ds_max_sdk_features_viewports_and_...

Usually a system based on render items is made in this way

bool CustomPlugin::PrepareDisplay(
      const MaxSDK::Graphics::UpdateDisplayContext& displayContext)
{
      // cook some new render items
}

bool CustomPlugin::UpdatePerNodeItems(
      const UpdateDisplayContext& updateDisplayContext,
      UpdateNodeContext& nodeContext,
      IRenderItemContainer& targetRenderItemContainer)
{
      // remove the existing render items
      targetRenderItemContainer.ClearAllRenderItems();
      // add the new render items
      for( auto& item: myRenderItems )
      {
           CustomRenderItemHandle newHandle;
           newHandle.Initialize();
           newHandle.SetVisibilityGroup(RenderItemVisible_Gizmo);
           newHandle.SetCustomImplementation(mpSampleItem.GetPointer());
           targetRenderItemContainer.AddRenderItem(newHandle);
      }
      return true;
}

The question is: how to invalidate the render items and triger the system to invoke again PrepareDisplay?

Actually now PrepareDisaply is only called when the frame changes.

Thanks

[sukoy27k]

No one knows?

[klvnk]

sorry miss understood the question

[sukoy27k]

Seems to work

ptrMaxObject->NotifyDependents ( FOREVER, PART_DISPLAY, REFMSG_CHANGE );
GetCOREInterface ()->ForceCompleteRedraw ();

[AtomLMW]

This is what exactly I am looking for,  the solution of yours will work, however is this the reasonable way? The sdk document has said that "each object prepares the display data only once", so I am wondering when the UpdatePerNodeItems function will be invoke to update the object. From my debugging shows that this function will be invoked when the selected state of the object changed.