topic Exception thrown if changing attributes e.g. transparency in Navisworks API Forum

Exception thrown if changing attributes e.g. transparency

christoph.schillingLHCFR — Thu, 27 Jan 2022 08:48:22 GMT

Hey,

we are using the dll Autodesk.Navisworks.Api in a custom developed Plugin. In this Plugin we use different apis, e.g. find an element or focus an element.

But we also want to set a general transparency to the full model for example.

Reading apis are working fine, but if we want to change something like transparency, then we get following message and Simulate is closing:

Exception thrown at 0x00007FFCA863AF30 (lcutil.dll) in Roamer.exe: 0xC0000005: Access violation reading at position 0x0000000000000000

Below you can find the source:

try
{
Document localDocument = Application.ActiveDocument;

var collection = localDocument.Models.CreateCollectionFromRootItems();

localDocument.Models.OverridePermanentColor(collection, Color.FromByteRGB(color.R, color.G, color.B));

}
catch (Exception ex)
{
Logger.Error(ex);
}

Does anyone had the same Issues?

Re: Exception thrown if changing attributes e.g. transparency

ulski1 — Thu, 27 Jan 2022 09:01:09 GMT

That is not how you set transparency the method is OverridePermanentTransparency
Beware that transparency is a double.
Change your code to use using statement whenever you use disposable objects like so:

using (ModelItemCollection searchResultCollection = searchObject.FindAll(Autodesk.Navisworks.Api.Application.ActiveDocument, false))
{
Autodesk.Navisworks.Api.Application.ActiveDocument.Models.OverridePermanentTransparency(searchResultCollection, mytransparency);
}

- also I recommend that you install the Visual Studio extension DisposableFixer

Br
Ulrik

Re: Exception thrown if changing attributes e.g. transparency

christoph.schillingLHCFR — Thu, 27 Jan 2022 15:11:59 GMT

Hey Ulrik,

sorry for that mistake with the code. I copied the wrong lines of my source code.

I have tried your proposal with dispose:

Document localDocument = Application.ActiveDocument;

using(var collection = localDocument.Models.CreateCollection())
{
localDocument.Models.OverridePermanentTransparency(collection, value);
}

but I am always getting the same error. Value hast the type double.

Many thanks for your hint with DisposibleFixer. I have installed it.

Greetings Chris.

Re: Exception thrown if changing attributes e.g. transparency

ulski1 — Thu, 27 Jan 2022 15:32:09 GMT

Createcollectionfromrootitem returns a ModelItemCollection but OverridePermanentTransparency takes a IEnumerable check if that is your problem