topic Re: Purge Unused Images in Revit API Forum

Purge Unused Images

SONA-ARCHITECTURE — Fri, 04 Oct 2019 13:11:49 GMT

Hi,

I can't correctly purge unsed images.

I'd like to got the same result as the tool called "Manage Images"

When I want to purge, for example : TextNotes, I can use this method (founded in BuildingCoder thx) :

I collect all TextNotes type

I collect all TextNote instances, and for each instance I remove the ID of the Type in my Collection of TextNotes Type.

FilteredElementCollector collector = new FilteredElementCollector(BIM_Extracteur._doc);
//all textNotesTypes
ICollection<ElementId> textNotesTypes = collector.OfClass(typeof(TextNoteType)).ToElementIds().ToList();
			
//all TextNotes Instances
FilteredElementCollector textNotes = new FilteredElementCollector(BIM_Extracteur._doc).OfClass(typeof(TextNote));
 			
foreach( TextNote textNote in textNotes )
{
bool removed = textNotesTypes.Remove(textNote.TextNoteType.Id);
}

But, with Images, it is more difficult and strange look :

For imagesType, it works fine :the command is :

ICollection<ElementId> ImagesTypes = collector.OfClass(typeof(ImageType)).ToElementIds().ToList();

But, for Images Instance, there is no Image type because image instance is typeof Element.

If I use this :

FilteredElementCollector ImagesCollector = new FilteredElementCollector(BIM_Extracteur._doc);
ElementCategoryFilter filter = new ElementCategoryFilter(BuiltInCategory.OST_RasterImages);	
ICollection<Element> images= collector.WherePasses(filter).ToElements();

The result is ImageType only

and when I use this :

ICollection<Element> images = new FilteredElementCollector(BIM_Extracteur._doc).OfCategory(BuiltInCategory.OST_RasterImages).ToElements();

Result is ImageType and Element for OST_RasterImage why?

And, if I got an image also used in Image parameter of my objets, that mean, I have to make a new filter to get all elements in all categories where image parameter containing my ImageType id?

Not sure to be very clear......sorry

Re: Purge Unused Images

Yien_Chao — Sat, 05 Oct 2019 15:36:51 GMT

Pierre,

for image instance did you try to add the filter : .WhereElementIsNotElementType() ?

that will catch only the instances.

hope it will help

Re: Purge Unused Images

jeremytammik — Sun, 06 Oct 2019 20:22:05 GMT

Thank you, Yien, for the very relevant hint.

Just what I also wanted to suggest.

The Building Coder has discussed a number of aspects of purging different group of elements.

A summary is provided here:

https://thebuildingcoder.typepad.com/blog/2017/11/purge-and-detecting-an-empty-view.html

Two more discussions have been added since then:

I really should summarise these all in an own dedicated topic group.

Since then, yet a few more related discussion include:

Purge unused -- https://forums.autodesk.com/t5/revit-api-forum/purge-unused-via-the-api/m-p/8815515
Purging Types and Families -- https://boostyourbim.wordpress.com/2016/10/20/rtceur-api-wish-1-purging-types-and-families
Purge unused materials -- https://boostyourbim.wordpress.com/2016/10/21/purge-unused-materials-for-another-rtceur-api-wish
Comment on performance advisor approach -- https://thebuildingcoder.typepad.com/blog/2018/08/purge-unused-using-performance-adviser.html#comment-4464788538

Oliver Green ported the VB code using the performance advisor to IronPython in case anyone fancies a copy:

Mike Turpin @ThatBIMthing added:

Got excited when i saw your post that there was a new solution then realised it was what i was already using 😁. I used this in my purge node in “turtle” dynamo package.

Best regards,

Jeremy

Re: Purge Unused Images

SONA-ARCHITECTURE — Mon, 07 Oct 2019 12:46:44 GMT

Thx Jeremy for all those links.

Thx Yien

So, I can get all Image Instances.

ICollection<Element> images = new FilteredElementCollector(BIM_Extracteur._doc).
WhereElementIsNotElementType().
OfCategory(BuiltInCategory.OST_RasterImages).ToElements();

I'm asking how Revit do for getting this kind ok list ?

'Cose I've got Generic models with Image property type added in those object.

I assume I have to use filter for all elements wich have an Image type parameter....

Re: Purge Unused Images

SONA-ARCHITECTURE — Mon, 07 Oct 2019 15:18:20 GMT

I thought make a Document.Delete and counting elements deleted in a ICollection<Autodesk.Revit.DB.ElementId> deletedIdSet but no way...

Re: Purge Unused Images

jeremytammik — Tue, 08 Oct 2019 07:13:45 GMT

Dear Pierre,

I do not understand exactly what you are trying to achieve, nor what problems you are encountering.

Cheers,

Jeremy

Re: Purge Unused Images

SONA-ARCHITECTURE — Tue, 08 Oct 2019 16:24:31 GMT

Jeremy

Sorry Jeremy for not being clear enough ..

In fact, I would like to know if an image is not used (as an image stuck on a view or as an image assigned to a parameter I hope it's clearer now.

Re: Purge Unused Images

jeremytammik — Tue, 08 Oct 2019 16:31:22 GMT

Yes, that much is clear.

A number of different approaches and attempts to resolve very similar questions have been presented and discussed in the links listed above.

I am not clear on which of those you have tested, why they fail for you, and if so, how.

It might clarify things if you share a minimal reproducible case:

https://thebuildingcoder.typepad.com/blog/about-the-author.html#1b

Re: Purge Unused Images

SONA-ARCHITECTURE — Tue, 08 Oct 2019 16:57:17 GMT

Thx Jeremy

I'm going to explorer solutions and I'll give you a feedback.

Many thanks for your disponibility

Re: Purge Unused Images

scott.deascentis — Tue, 04 Aug 2020 13:26:02 GMT

I'm so curious... what are you doing in this screenshot? I love legos!