Invalid cast: Line » Line

Replies to This Discussion

Permalink Reply by Tomas Vinkevicius on October 26, 2016 at 3:08am

Hi,

It is Rhino.Geometry.Line.

It is very strange. I have components that I made before and they worked.

For instance I have the same problem with Mesh input.

I have compiled component with mesh input, and I get the same error: Invalid cast Mesh>>Mesh.

One week ago it worked, now it does not. And this another component, was not even touched/changed/recompiled in visual studio.

Stange...

Permalink Reply by Marios Tsiliakos on October 26, 2016 at 3:16am

I would suggest to use GH_Structure(of T) when working on custom components.

Its should work fine if you cast your line to GH_line type. There are available methods for this in the GH SDK.  All geomtery has to wrap around the IGH_goo class.

Ta,

M

Permalink Reply by David Rutten on October 26, 2016 at 3:18am

Strange, Try with GH_Line, that is how lines are actually stored.

Permalink Reply by Tomas Vinkevicius on October 26, 2016 at 3:50am

Same error. What did I do wrong?

Permalink Reply by Tomas Vinkevicius on October 26, 2016 at 4:10am

Yes, tried to generate new guid several times. And I also do not get error if there are two components with the same id.

Permalink Reply by Tomas Vinkevicius on October 26, 2016 at 4:18am

Also tried to create a new project in visual studio.

Same error.

Permalink Reply by David Rutten on October 26, 2016 at 4:36am

There's a GH_Line in GH_IO.Types, that's not the one you want. Try specifically using

List<Grasshopper.Kernel.Types.GH_Line>

and/or

List<Rhino.Geometry.Line>

Permalink Reply by Tomas Vinkevicius on October 26, 2016 at 5:29am

This one works:

List<Grasshopper.Kernel.Types.GH_Line> lines = new List<Grasshopper.Kernel.Types.GH_Line>();
if (!DA.GetDataList<Grasshopper.Kernel.Types.GH_Line>(0, lines)) return;

This one does not:

List<Rhino.Geometry.Line> lines = new List<Rhino.Geometry.Line>();
if (!DA.GetDataList<Rhino.Geometry.Line>(0, lines)) return;

Thank you:)

How can I cast GH_Line to Line to access function such as line.from line.to ?

Or is it possible to access those functions from GH_Line?

Permalink Reply by Tomas Vinkevicius on October 26, 2016 at 5:55am

Found . value

Permalink Reply by Daniel González Abalde on October 26, 2016 at 4:34am

Have you tried to ask for more information about the problem?

protected override void SolveInstance(IGH_DataAccess DA)
{

try {

List<Line> lines = new List<Line>();
if (!DA.GetDataList<Line>(0, lines)) return;

} catch (exception ex) {
rhinoapp.WriteLine(ex.ToString);
}

}