Object disappear with rhino command Explode

Rhino Rhino for Windows
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1

Dear support , I create a brep object , and with the command Explode , it disappears sniff , with rhino6 no problem , and with rhino7 and 8 I get this problem , you can find the example file , if you select the brep and _Explode it …
(the brep doesn’ have any problem with check command)
thanks
Laurent
Part2.3dm (178.0 KB)

2

Taking a look. Was this created in Rhino? something is off with the Backfaces (turning those on or adjusting transparency shows the objects), they also show in rendered modes.

3

Look at the object color.

image

I think you need to remove the polysurface face colouring using RemovePerFaceColors before you explode. Also, not sure why it’s grouped, but I would ungroup this. Grouping isn’t joining.

4

I’ve created a bug report RH-83164, thanks for the report.

The issue being that even if the objects are set to fully transparent this object and its isocurves should still show in Wireframe.

5

Hello Japhy , Dan ,
thanks for your analyze ,it was an error on my side , I will change
on_brepface->SetPerFaceColor(ON_Color(rgb.R(), rgb.G(), rgb.B(), 255));
by
on_brepface->SetPerFaceColor(ON_Color(rgb.R(), rgb.G(), rgb.B()));

because the 255 is transparent “int alpha // ( 0 to 255 ) (0 = opaque, 255 = transparent)”

(it is strange , as I put all faces transparent why the brep isn’t transparent …)

thanks
Laurent