Revolve result is not smooth

[JA_10341562]

Hello guys.

I'm sorry to ask such a dumb question, but I'm absolutely stumped on it. And it's REALLY dumb.

The attached model is a simple revolve of a 25 mm wide tire profile with a 700 mm radius out to the rim. (Yes, it's not realistic, but this problem happens even if I reduce the radius to 400 or 50 or whatever.)

The revolve feature ends up all chunky, instead of smooth. If I reduce the radius to 50 mm, the inside of the feature ends up all chunky instead.

I have changed the model accuracy both up and down and nothing ever changes.

Thank you for advice on how to get back to the regular, smooth revolves that I know and love.

Edited to add:

OK, I think I see what's happening. Tourus-shaped revolves have this, but cylinder shaped ones do not. With this sketch:

I get this revolve, showing both the nice smooth edges I was expected, and the blocky edge (on the torus in the middle).

[tbraxton]

Try setting the edge display to high or very high and report back on the results of doing this.

File->Options

[JA_10341562]

That did not fix it. (Mine was on medium.)

That reminded me that I use a config.pro full of defaults shared by my whole team. I set the startup directory of my Creo shortcut to use a directory with no config.pro, in order to get the defaults straight "out of the box" from PTC, and I still have the problem. I also created a new part not using our company default template, and still the same problem.

I also happen to have Creo 9 still installed, and it is doing the same thing.

I feel like I'm losing my mind, and that it's always been like this. But when I look at tutorials about adjusting precision, etc, I see beautiful smooth revolves that I can no longer get my Creo to draw. Argh!

[tbraxton]

Try increasing the shade quality if you have not done that before. It is most likely a display issue. Post the model if this does not work, so it can be checked in a different environment.

[tbraxton]

It could be accuracy related, in which case having the part will be helpful in troubleshooting. Post the model in Creo 7 or older and then I can test it.

[JA_10341562]

Sorry, I have only Creo 9 or 10 installed.

I've updated the original question with a better example, that shows that it's not display or accuracy related, because I can get smooth revolves, just not of toruses.

Thanks and have a nice day.

[KenFarley]

I'm using Creo 9 and I built myself a quick torus 8 inch ring diameter, 0.50 inch diameter swept profile.

Using the default for File -> Appearance -> Model Display -> Shade Quality, it looked pretty chunky. If I increase the value of that setting to the maximum (50) it looks much smoother and stylish. I also have Edge display quality set to Very High, but I don't think that affects the shading.

[tbraxton]

700mm radius with 25 mm diameter xsec in Creo 7 with shade quality at 30 looks pretty smooth.

[StephenW]

I have have extremely detrimental performance effects of setting shade quality to a high number. To the point that I could not work on a large assembly at all. Took a little while to figure out that was what the problem was since I had changed it several days before and only later realized that it wouldn't work with a large assy.

I would preach caution with shade quality.

Of note, some options in the config.pro takes a restart of creo to have an effect. I don't know if that could be a problem here but just noting it.

[kdirth]

Sorry to say, but that looks like a normal representation of a revolved circle in Creo.  It is only a rendering aberration.

[Constantin · Accepted solution]

Hi,
this is definitely shading quality related (set to 1, 5 and 20 in the screenshots)

Why the shading quality setting only seems to apply to non ruled surface types, I do not know.