Color Preview C#

Hallo,

I am trying to build a GH component witch should provide some graph analysis functionality on curve geometry and want to colorize the input geometry according to analysis results directly in my component and not force the user to use the build in custom preview component.

I only find a previewUtil class witch show its results only when I turn off preview on the GH component and hide the rhino geometry.

Is there some another way?

Please be patient, its my first compononet a I am little bit confused right now.

Thanks a lot

Martin

Replies to This Discussion

Permalink Reply by David Rutten on November 6, 2011 at 5:52am

Hi Martin,

so you want to draw custom geometry from within your component instead of the default geometry drawn by input/output parameters?

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Martin Bielik on November 6, 2011 at 7:10am

Hi David,

Yes, that's what i want. I would like have the same functionality as the Custom Preview component has. Is there some way how to achieve it? or can build component witch is using another componets funcionality? I am new in C# (Java before) but i see that RegisterInputParams is protected so i cannot acces it from my class. Or is there some another way how to it?

Probably too many questions but I am trying to get a bigger picture how does it work.

Permalink Reply by David Rutten on November 6, 2011 at 8:05am

Here's what you need to do. On your class that derives from GH_Component, override the methods called ClippingBox, DrawViewportWires and DrawViewportMeshes.

The ClippingBox property needs to return a BoundingBox that contains all the geometry you're about to draw. You can draw points, curves and meshes etc. in the DrawViewportXXXX methods.

If you want to maintain default component preview behaviour then be sure to place calls to the base class methods as well.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Martin Bielik on November 11, 2011 at 3:59am

Thanks a lot, its working now!

Permalink Reply by Lukáš Kurilla on November 19, 2011 at 7:37pm

Hi David,

I can't see preview icon in component menu when only my GH_Param(T) is registrated in input method. Maybe problem is in my T object. Is It possible to set T object as preview-able object and activate this preview icon or do I have to inherit it from other base geometry T objects?

Thanks

Lukas

Permalink Reply by Martin Bielik on November 20, 2011 at 3:34am

Hi Lukas,

just try to override the IsPreviewCapable method and set it to true.

Martin

Permalink Reply by Bruno Galvao on April 29, 2015 at 9:10am

Hi David,

I'm trying to do something similar here, but i'm afraid i'm a bit more unexperienced than the original poster.

I want to preview some Geometry(points/curves) created from inside the component, without having to output them.

Is it possible to send some "example" code where this is done?

I don't understand what i have to do after overriding the methods, or how to call them with GH Geometry types such as GH_point type.

Thank you,

Bruno

Permalink Reply by David Rutten on April 29, 2015 at 10:07am

What programming language? And what sort of things do you want to draw?

Permalink Reply by Bruno Galvao on April 30, 2015 at 8:58am

Thanks for the quick reply!

I'm building some components in c# .
Right now i'm creating gh_points out of my data to send to the viewport, through an output. These points won't be inputs further on, so they would be just polluting the component...

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