topic Re: IPointCloudAccess.CreatePointSetIterator's parameter ElementId providing the current view is always invalid. in Revit API Forum

IPointCloudAccess.CreatePointSetIterator's parameter ElementId providing the current view is always invalid.

Oliver_Bringmann — Wed, 14 Jun 2023 20:12:18 GMT

The IPointCloudAccess.CreatePointSetIterator method should provide an ElementId for the current view. We always get an InvalidElementId (-1).

Why do we need the view?

For a dense rendering we should fill the provided buffer in IPointSetIterator.ReadPoints with only visible points in the foreground. In the best case one point per pixel for dense rendering. Is this a correct interpretation?

Thanks, Oliver

Re: IPointCloudAccess.CreatePointSetIterator's parameter ElementId providing the current view is always invalid.

jeremy_tammik — Fri, 23 Jun 2023 09:00:28 GMT

Thank you for your pertinent question. I asked the development team for you.

Re: IPointCloudAccess.CreatePointSetIterator's parameter ElementId providing the current view is always invalid.

naveen.kumar.t — Fri, 23 Jun 2023 11:40:43 GMT

Hi @Oliver_Bringmann ,

Your Question 1: When providing current view element id to IPointCloudAccess.CreatePointSetIterator() viewid parameter, you are always get an error as InvalidElementId (-1).

Answer : Could you provide more details on this? Are you implementing this interface? Or Are you calling this interface that is implemented by others? This API is supposed to return a handler to IPointSetIterator instance. How did you get InvalidElementId? Which View are you using?

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Your Question 2: For a dense rendering, we should fill the provided buffer in IPointSetIterator.ReadPoints with only visible points in the foreground. In the best case one point per pixel for dense rendering. Is this a correct interpretation?

Answer : Are you using using custom PointCloudEngine? In that case IPointCloudAccess.CreatePointSetIterator depends on the custom implementation. For dense rendering, regardless of performance, you could make one point per pixel. But usually you could implement filter for difference scale cases

Re: IPointCloudAccess.CreatePointSetIterator's parameter ElementId providing the current view is always invalid.

caiguonengW8PLN — Wed, 06 Sep 2023 15:32:00 GMT

How do you obtain views through the CreatePointSetIterator function？I want to obtain the zoom in and zoom out ratio of point clouds through views, but I'm not sure if this method is reasonable. How do you obtain the zoom ratio of the current view of the point cloud？