I n ghosted mode or shaded with opacity reduced to about 100: Is it on purpose that a closed polysurface looks slightly different than an open surface?
Only in ghosted mode I see some weird dark gray or orange overlay of multiple objects even though just one object is selected. Something seems broken in ghosted mode.
pipes.3dm (3.4 MB)
Hi Martin -
I’m seeing the same in Rhino 5, 6, and 7. That makes it look to be on purpose to me, yes.
I’m not sure what I need to do to reproduce this here.
-wim
Thanks Wim.
Here’s a Rhino file with two boxes. I created the smaller one first and then the larger one.
In ghosted mode, selecting the larger box highlights both boxes.
two_boxes.3dm (44.8 KB)
Hi Martin -
I’m not seeing that here in a factory-default Rhino scheme:
Which changes have you made to the Ghosted mode?
-wim
I found it. It’s because of Shade-highlight
Thanks, Martin.
It looks like we have that on the list as RH-76687 Shade-highlight highlights wrong objects
-wim
I’ve been under the understanding that the render mesh for a closed poly, is more water tight than a render mesh of not closed poly.
I’ve noticed gaps of the render mesh to be tighter for one of being closed than one that is open.
Due to these observations, yes the render meshes of srf’s that are exploded appears to be more obvious in comparison with them of the render mesh after they’re joined.
Render mesh of multi-srfs that aren’t joined will look very leaky, as compared to them after joined.
I guess I never really consciously considered the closed state to be visually different than open state 
Until now, maybe it’s been subconscious 
I don’t see the logic in this opacity…
Closed extrusion and polysurface look identical. Open extrusion looks like an open polysurface.
The render mesh of a closed cube has 24 vertices, open extrusion render mesh has 16 vertices.
closed_open_opacity.3dm (110.5 KB)
Here with backfaces on:
Difficult to distinguish which is which no?
Maybe somem to do with the grid quad setting.
I noticed “extrusions” do have less ‘isocurves’. I always thought it was weird. I think I turned off ‘extrusions’ a couple days ago. … as per Why do extruded fillet curves result in polysurfaces instead of surfaces? - #4 by davidcockey .
Not sure what the theory behind ‘extrusion objects’ is supposed to be lol. Maybe, less surface count… idk.
