A text object (word or multiple words) can be "tapered" with an extrusion of 0, resulting in what appears to be extrusion. With a taper value of less than 100%, the faux extrusion appears with no taper. Here's an example.
Taper values greater than 100% produce an apparent expanding taper.
Note that the faux extrusion does assume the material assigned to the extrusion.
In a direct overhead view, the text has no extrusion. It is only when viewed from the default camera or any angle other than directly above or below that the real situation is visible.
The resulting 0 Extrusion, >100% Taper object can be ray-traced, with predictably strange-looking results, and subsequent (after the render is complete or has been interrupted) adjustments to the Taper parameter can result in a crash of Photoshop. (I have dumps if anyone wants to look at them).
With vector objects, there is no issue. This is peculiar to text.
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Any typeface. Only text. With or without extensions loaded.
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Photoshop Touch 10.0
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Thanks for the system info. We'll look further into this.
I see the bad face rendering, which is the collision of the two faces (front and back) occupying the same planar space. I haven't been able to crash or see an active core that doesn't spin down after Ray Trace rendering. I tried this on Win7 64 machine but it is an AMD chipset and an ATI video card.
One thing I do notice in your setup is the video driver for the second display reports as very old:
Driver Version: 7.1.542.0
Driver Date: 20060522000000.000000-000
Do you have your cards configured to use SLI? Photoshop can't take avantage and we might be getting tripped up by it.
That "Video Card 1" is the LogMeIn mirror driver. It's up to date. It's a virtual display for remote access only, and really only kicks in during remote access sessions (and makes no use of the GPU, as far as I can tell -- it certainly disables all the OS GPU-related features such as Aero). I do recall that Apple's Bootcamp update wouldn't install on a Macbook Pro until the virtual display driver had been uninstalled, but I don't think this is a similar or related issue.
I don't use SLI as I don't do gaming, and, as you say, neither Mercury nor any of the other Adobe video functions use it.
The odd rendering isn't unexpected. The ray tracer is trying to render a non-existent extrusion, so you'd have to expect something bizarre. RT works just fine with a normal extrusion, bevels, inflation, etc. It's only taper that's broken, and only for text. Nothing happens on screen when you adjust the taper of a normal vector object with 0 extrusion. With text, it goes wild.
Note, though, that with text ANY taper other than 100%, even with a non-zero extrusion setting, still triggers wacko rendering, so I don't think it's just a matter of front and rear materials being rendered in the same plane. (It should be able to compensate for a 0 extrusion, all things being equal, or it should be trapped and trigger a warning message. Either way, it's non-optimum.)
I don't get what your seeing with a severely less powered Win7 system (Intel Centrino, Nvidia Quadro FX 570M).
To be clear, do you see this just when making an edit to the mesh (interactive mode), just when rendered (RT) or both?
I'm also trying to understand your last paragraph: "...text ANY taper other than 100%, even with a non-zero extrusion setting, still triggers...". So a text extrusion of 100px with a taper of 110% is showing like above? If that's the case, then there's no face collision, and I'd hazard you have GPU problem. What happens if you change the Extrusion material to 0% opacity?
With those settings what you're seeing are multiple polygons that are drawing on the same plane. I see it a some conditions with GPU and CPU rendering (not limited to just text extrusions). You can reduce many of the poor looking results by targeting the Scene node in the 3D panel and then going to the Properties panel and checking on, 'Remove Hidden: Backfaces'.
Are you running into problems besides the display issues? I haven't been able to see any indication of a core getting stuck after running a 'Render' command.
Steve, please. I know how to avoid the display and rendering problem and I'm not trying to solve it. The issue is a UI behavior that should not exist.
This is not a problem I'm trying to solve, it's a bug I'm trying to report. Taper does not behave the way it should on a 3D Extrusion from text. Symptoms abound of an underlying issue in the code. Unfortunately, we no longer have access to the standard bug reporting forms, so I have to post here.
Here's the deal. From long years of experience I know that lots of weird, hard-to-reproduce symptoms can arise from an undefined behavior that is allowed in the UI even though the underlying code has no way to handle it (a non-zero Taper on an Extrusion of 0 depth is meaningless, so unless that condition is trapped in the underlying code it is "undefined") . Worse, that particular kind of error can "lurk" once triggered, and not show up as a problem until minutes or hours later.
What does show up can appear random, and the time displacement may make it hard to connect to anything. I've seen this happen in exactly this kind of circumstance more than once over the years. It's a beta tester's nightmare, because a tester's job is to give the team ways they can reproduce the bug. I've worked on too many beta cycles (not just with Adobe) not to know that.
So when I see obviously bogus behavior (an "extrusion" appears when I change the taper parameter), I report it. If it seems to have more serious implications, I report it with exclamation points.
The Taper function and the text 3D extrusion module are suspect. I've seen Taper crash Photoshop (PS crashed the instant I adjusted the taper parameter during one of my tests); the stuck thread showed up during a session when I was working with complex text extrusions and had thoroughly maxed out RAM on both GPU and main memory; and today, after a short test render of a 3D text object with 0 extrusion but plenty of taper, selecting Front Inflation and changing its material resulted instead in a change in the Extrusion material, and vice versa. That's impossible, but there it is. At this point I can reproduce Taper errors reliably on two very different systems. It's a bug.
Okay, I got it. You want to report that the UI shouldn't allow for z-fighting to be created so easily.
To be clear, there's no "undefined" condition setup. The multiple co-planar meshes are defined, and it's just the display of this condition that results in the 'artifacts'. IOW, the extrusion of 0 with a non-100% taper is expected to create a co-planar mesh condition, resulting in potential z-fighting display artifacts.
I was mainly trying to ascertain from you if you had repeatable steps that exhibited crashing/hanging problems with video card drivers, and so far it doesn't sound like you do.