Setting the preview colours (C#)

Replies to This Discussion

Permalink Reply by Florian Frank on January 4, 2013 at 2:55pm

Hi Joost,

the code seems to be right. I've done the same a lot of times...check your values in the m_RGBNrs Array/List!

 

Here you can see an example:

 private void RunScript(List<Brep> x, ref object A)
  {
    breps = x;
    color = new List<int>();
    for(int i = 0; i < x.Count; i++){
      color.Add(i * (255 / x.Count));
    }
  }

  //<Custom additional code>
  List<Brep> breps;
  List<int> color;

  //Draw all meshes in this method.
  public override void DrawViewportMeshes(IGH_PreviewArgs args)
  {
    for(int i = 0; i < breps.Count; i++){
      args.Display.DrawBrepShaded(breps[i], new Rhino.Display.DisplayMaterial(System.Drawing.Color.FromArgb(color[i], 0, 0)));
    }
  }

Attachments:

• drawBrepShaded.gh, 3 KB

Permalink Reply by Joost Lauppe on January 5, 2013 at 10:44am

Thanks Florian,

I would expect the code to work as well but somehow all the breps turn dark red. I've checked the m_RGBNrs and they hold different numbers for the different breps.

The thing which I can't explain is that the DrawViewportMeshes method gets called several times, this might be the reason that the it mixes up the colors. I've attached the component.


Joost

Attachments:

• HatchComponent.cs, 5 KB

Permalink Reply by Florian Frank on January 5, 2013 at 10:56am

Ok so this its displaying the same color cause it's called for every brep...

do you have set the input of your Breps to List Access, as i is in my example?

The input should be of Type "List<Brep>" and NOT "Brep"...

If it doesn't work, you should try this:

if (runCount == 0){
...
}

If you're working on a Custom Component to be compiled use DA.Iteration instead of "runCount".

Permalink Reply by Joost Lauppe on January 5, 2013 at 12:06pm

Thanks Florian,

I've used this runCount == 0 statement to clear the rgb and brep lists, is that what you're hinting at?

I've come a bit closer to the problem, but still haven't resolved it. It seems that the breps are coloured according to the specified rgb's, but these colors are somehow mixed with the standard red preview colour, so differences between breps become almost unnoticeable...

Any ideas?

Permalink Reply by Florian Frank on January 5, 2013 at 1:11pm

Yes...runCount is important if your Script gets executed several times within one change of data (supplied Brep list).

Hm so your specified colors are all close to red? Did you use a DisplayMaterial with opacity or without? If the opacity is really low the preview color from GH might overlay your custom preview.

Do you output the same Breps from the script component? So in this case you have to turn the preview for the specified output off.

...see the code in the attached definition.

(It's an example from David that i translated to C#)

If this doesn't work, can you send any example, so i can take a look at it?

Attachments:

• DisableOutputs.gh, 2 KB

Permalink Reply by Joost Lauppe on January 5, 2013 at 3:15pm

Yes, you're right, the breps are output in the same component. I made the mistake of setting the opacity to 0.9, which made the colour difference very hard to notice. I've adjusted that to 0.5. However still the standard red color blends with the set colours. If I understood you correctly there is a way of turning that of while remaining the set colours.

Could you sent me the code which enables me to do that? I couldn't read the code from the .gh file you attached.

Thanks for your help so far!

Permalink Reply by Florian Frank on January 5, 2013 at 3:46pm

if (runCount == 0)

{

IGH_Component component = (IGH_Component) owner;

IGH_Param param = component.Params.Output[2]; //2 is the index of the Output to hide

IGH_PreviewObject prvObject = param as IGH_PreviewObject;

if ((prvObject != null)) prvObject.Hidden = true;

}

Permalink Reply by Joost Lauppe on January 5, 2013 at 4:03pm

Thanks,

So this should be included in the SolveInstance method? The part I don't understand is (IGH_Component) owner, how should that be translated for a custom component?

if (DA.Iteration == 0)
{
IGH_Component component = (IGH_Component)owner;
IGH_Param param = component.Params.Output[0];
IGH_PreviewObject prvObject = param as IGH_PreviewObject;
if ((prvObject != null)) prvObject.Hidden = true;
}

Permalink Reply by Florian Frank on January 5, 2013 at 4:38pm

for a custom component this doesn't work...

DA.Iteration == 0 was just thought to work for your custom display code

If you're doing a custom component you might write in your "RegisterOutputParams" method:

pManager.HideParameter(index)

This will not draw the geometry from the output at the specified index.

I'm a bit confused now...are you working on a custom component or on the script component. the two differ a little bit and i don't want to create more confusion by not knowing what's your aim.

Permalink Reply by Joost Lauppe on January 5, 2013 at 5:03pm

Yes! I've fixed it! Finally... Also thanks to some of your suggestions.
Eventually I found a way to display the individually coloured breps without the red overlay.

Sorry for the confusion, I am indeed working on a group of custom components.

Thanks again.

Permalink Reply by roderick read on August 30, 2013 at 3:34am

Did you manage to build the components Joost?

This is certainly an issue I keep coming up against.