Lines missing in viewports

[Steve Habkirk]

I am having a problem with circular extruded objects missing lines in viewports.

This is happening when I use hidden line rendering with an isometric view. It seems that rotating the view slightly, sometimes, makes the lines appear, but often other lines disappear at the same time. When I am in the design layer, with an isometric view and hidden line rendering, the object displays properly. When I make a viewport from the view and place it on a sheet layer, lines are missing.

I am using VW 12.0.1 on a PowerBook G4. Any insight would be greatly appreciated.

[Benson Shaw]

I can't reproduce your situation, but this may be something similar: Viewports default to display showing 3d objects in same view/projection as design layer setting it came from, but 2d objects display in ground plane. Note that you can change the viewport view in the OIP. Work around is to remove the 2d objects from the design layer and add them as annotations in a saved view of the viewport.

Here is an example: In plan view draw 4 circles, same diameter, aligned on the x axis and separated by a diameter. extrude them so extrude height equals 2 diameters. Change view to front (shows a row of 4 rectangles) and change the z heights so the tops are not at same height. Now draw a polyline (2d) which zigzags to connect/pass through top left corners of extrusions. Now create a new viewport/sheet layer with extrusions and polyline - check the "project 2d objects" box in the OIP. In my test, the polyline displays as if it were drawn on the xy plane in the viewport- it displays as a straight line in front view, as a jaggy line in plan, never "connecting" the left corners of the frontview extrudes as it did in the design layer. Set the view to Front, double click the viewport to edit it, choose annotation mode and draw a new poly (make it a dif color from the design layer poly) connecting the upper right corners. Exit edit mode and change views of the viewport to see that the annotation poly always stays in the screen plane (but moves) while the design layer poly always stays in the ground plane. A saved view lets you quickly display the viewport with annotation poly connecting the corners

good luck

-B

[Steve Habkirk]

Benson-

Thank you for your thoughtful response! I am pretty certain though that my problem is not coming from 2D objects mixing in with my extruded circles. One of the models I am working with consists of two extruded circles and one extruded rectangle, with no other 2D objects. Actually, the only workaround I have found for my problem so far is to manually draw the missing lines in the Edit Annotation mode of the Viewport!

I should have been more specific.... The lines that are missing in my isometric views are some of the extruded circle's sides. In other words, I have this 3D object that looks like a cylinder, which, when viewed obliquely, should have two lines parallel to its longitudinal axis, one on either side, representing the cylinder's width. In my viewports, one of these lines will be missing, but in the design layer, in a 3D view and rotated to an oblique viewing angle, the lines all appear properly.

Thanks again for your input.

Steve

[Andrew Bell@NV]

Submit a file to bugsubmit@nemetschek.net or send it to me directly, and I'll take a look-see.

[Steve Habkirk]

Thank you Andrew.

I have emailed you a copy of a file exhibiting this problem, along with some explanatory text. I will wait to see what you think before submitting it to "bugsubmit".

Steve