Capture Viewport To Bitmap

Serengeti (Rhino WIP) Developer
1

Hi,

I belive there is a bug in display pipeline.DrawToBitmap and RhinoView.CaptureToBitmap functions (probably both calls to the same source function)

Setting a 1000x1000 resolution the result is ok (Color is good):

bm2
bm2.png1000×1000 86.2 KB

but setting a wide ratio (2000x1000) the result looks white

bm1
bm1.png2000×1000 169 KB

This is the exemple code:

 protected override Result RunCommand(RhinoDoc doc, RunMode mode)
    {
        var circle = new Circle(Plane.WorldXY, 10).ToNurbsCurve();
        var hatches = Hatch.Create(circle, 0, 0, 1, RhinoDoc.ActiveDoc.ModelAbsoluteTolerance);

        var attr = RhinoDoc.ActiveDoc.CreateDefaultAttributes();
        attr.ColorSource = ObjectColorSource.ColorFromObject;
        attr.ObjectColor = Color.Crimson;

        foreach (var hatch in hatches)
            RhinoDoc.ActiveDoc.Objects.AddHatch(hatch, attr.Duplicate());

        var pathDesktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

        var bm1 = DisplayPipeline.DrawToBitmap(RhinoDoc.ActiveDoc.Views.ActiveView.ActiveViewport, 2000, 1000);
        bm1.Save(Path.Combine(pathDesktop, "2000x1000LooksGray.jpg"));

        var bm2 = RhinoDoc.ActiveDoc.Views.ActiveView.CaptureToBitmap(new Size(1000, 1000));
        bm2.Save(Path.Combine(pathDesktop, "1000x1000LooksOK.jpg"));

        return Result.Success;
    }

Could you let me know if there is an other way to capture the bitmap in wide snapshot?

Thanks and Best Regards

2

Hi @henrydm,

I am not seeing this on my system running the Rhino 6.1 release candidate. Here is what I used to test

TestDrawToBitmap.py (999 Bytes)

Are you seeing this on other systems? What video card does your system have? (Help > System Informaton)?

– Dale

3

Hi Dale,

I tested it in a Nvidia Quadro K600, Nvidia GTX 970 and Intel HD Graphics 4600, I did it, using your python script and the c# code I provided with the same result.

Best Regards.

4

Make sure to disable any custom plugins when testing just to make sure that you and Dale are really performing the same test. Does that make any difference?

5

Hello Steve,

I tested it in safe mode, enabling only the example plugin, you can see it here:

The code is the same but the behavior is different, (the first example was made using Rhino Beta) but there is still a problem width the 2000x1000 picture and any other wide resolution.

Best Regards