Post a screen shot but I am not certain you did the right thing about expanding the appearance.
I made the maze with the pen tool as in the bottom screen capture and gave it a custom shading color a gray.
Then I reoriented the effects rotation in the extrudes dialog you can then make the walls higher or lower by changing the extrusion depth
this will give control over the maze if you use more than one path for the maze you might want to group before extruding.
No, the 3-d engine is the problem. It'll do this to the simplest of shapes and then correctly render the most complex without blinking... Or if it's not in the mood, the other way around...
Finessing your settings can sometimes help (or make worse) - doing things like making your rotation 12.05˚ instead of 12˚
If that doesn't work for you, effect->transform can sometimes stand in for the 3-d effect.
Draw the top of the "wall" (assuming you use a stroke. Sub fill below if you used a fill)
Add an additional stroke behind your top that will become your wall, using the appearance panel.
Apply a transform to that stroke moving it down and over (or however you want your 3-d effect) and specify a few copies.
Or... You can just use the 3-d render as a template to draw it out by hand. Sucky, but sometimes the only option.
I think you might be right in that the engine is finicky. I was just going back to do a screen shot and wanted to make just a small adjustment and the walls then appeared! Moving it again, they pop back out, and so on an so fother.
I wish it were more reliable because it is fun to use.
wall.jpg 20.0 K
I will try this again I think the problem is that you expanded the appearance, maybe I am wrong.
You might not relate to the simple way in which I do things so though I would be successful you might not find it appropriate to the way you want to go about it.
The strokes are still strokes no need to expand just group. There is one small artifact but I would say it was that I was working fast and need to place that path better than I did when creating the art.
Oddly enough, I just ran into this with some arrows I was making and the solution (this time) was to "draw hidden faces" which is hidden under "more options" in the 3d dialog.
just tried without expanding the lines and it did seem to work. Although I noticed in somplaces the I could definitely see a break in the "walls", as if the lines were not butting up against each other (but I think that's my fault).
I've drawn the maze using the pen tool, applied a very thick stroke, then expanded the appearance. So far so good.
When trying to get help with an aberent behavior, please state the steps you perform accurately. Otherwise, no one can replicate what you are doing in an attempt to replicate the problem.
Expand Appearance is not available when you have simple stroked, unfilled paths selected. Did you select Object>Expand? If so, did you have both the Fill and Stroke checkboxes selected, or just the Stroke?
Or did you use Object>Path>Outline Stroke?
When 3D Effect leaves out surfaces, it is usually (no, not always) due to self-intersecting surfaces (most commonly because of colliding surfaces on bevels); in other words, the instructions it is receiving are geometrically ambiguous.
Of course, you didn't provide your specific file, so no one knows where your paths start and end. No one knows if your paths include Compound Paths, and if so, no one knows if their winding is set correctly. So an effort to replicate your problem would be an endless guessing game. But try this on the same original set of paths:
1. Select the paths. Make sure they have normal strokes, no fills, no Brushes.
3. PathFinder Palette: Click the Add To Shape Area icon and expand the results. Now you have either a single Compound Path or a Group containing a combination of Compound Paths and simple closed paths. The paths have no strokes, only fills. This is the kind of unambiguous path information 3D Effect needs for predictable results.
4. Apply 3D Extrude. No Bevels. See if you get the same problem.
Re-did it using outline stroke and adding to shape so that it is one compound object. Took it to extrude and it was doing fine until I started playing with the perspective. It seems at certain degree angles I would get the dropped out areas. However, I did find a spot that worked for me and will use that position.
Many thanks to all for your help.