BUG: Extrude taper rotation length

[cekuhnen]

at 90 degree the surface disapears and the 90 number is red!

this should work like the make draft in Alias.

also adjusting rotation changes the extrusion length

[WHolzwarth]

How did you create the 3DSketch at the start, Claas?

[cekuhnen]

I made a sketch curve and then moved the spline perpendicular away from the construction plane with the move command.

I did the same fro the back curve and the C that hangs down. then I drew the side splines by spanning to the end points.

[cekuhnen]

Here is a video
https://docs.google.com/a/ckbrd.de/file/d/0Byzv_NlyKp_2bDBmcmd6aUpZMG8/edit?usp=docslist_api

[WHolzwarth]

Hmm. I'm just trying to follow-up your workflow.

I'm seeing some differences in the grid settings.

On your video I can see sub-grids well enough.

But not on my sytem

I'm on Windows 7 with an AMD/ATI FirePro V7800 card. Are you on a Mac?

Cheers

Walter

[innovatenate · Accepted solution]

The extrude command is measuring length in the direction of the normal. As you change the angle, the surface has to extend to match the length according to the normal direction. Compare the images below for reference.

This may help also explain why this command works when the taper angle is set to 89.999 deg and fails for 90.000 deg. At 90 degrees the distance must be 0 in the normal direction!

Instead of using the Extrude command, a better command bay be to use the Extend Surface command from the Modify drop down menu in the Sculpt environment.

If the results aren't what you had in mind, another solution is to loft to another straight sketch line. I did a copy and paste in the original sketch to get the line in just the right position. This ended up being a pretty quick solution.

I hope this information helps! Please let me know if you have any questions.

Thanks,

[cekuhnen]

Hi Nathan,

Thank you for explaining this. Looks like the Fusion devs have to give the code/algorithm some loving.

It is a pretty standard feature to extrude and taper/rotate the direction. Fusion is the only app that seems to fail at this I know.


Take a look at the make draft tool in Alias. Thats honestly the way it should work. Everything else are time consuming work arounds that add additional complexity and their own pitfalls.


http://knowledge.autodesk.com/support/alias-products/learn-explore/caas/CloudHelp/cloudhelp/2014/ENU...

[innovatenate]

I thought of one more solution to this! Check out this screencast for further details.

http://autode.sk/1PuzWcx

The normal direction in this case is based upon the original plane that you started the sketch on. If the sketch was originally placed on the XY, then the extrude direction would have gone along the Z axis. Unfortunately, the Patch Extrude does not seem to have all the bells and whistles of the create draft surfaces command in Alias. For this instance, an IdeaStation request would be the best way to share the love. 🙂  Feel free to promote the Idea here, I will give it a Vote!

Please let me know if you have any questions! 

Thanks,

[cekuhnen]

Already added an idea. I think the current approach with the patch normal is not really that useful because of its limitations.