two other issues with curve caps #35039

New Issue

Alexander N. · 2013-04-20T12:46:23+02:00

Alexander N. commented

2013-04-20 12:46:23 +02:00

%%%--- Operating System, Graphics card ---
Windows 64 SP1 64bit, intel i3770 internal GPU

- Blender version with error, and version that worked ---

blender-2.65a-windows64.zip - with issues
blender-2.66a-windows64.zip - with issues
blender-2.66-r56175-win64.zip - with issues

- Short description of error ---

two issues in modeling (and one maybe indirect related to the GPU)

if you have a cyclic curve with a bevel object and you have "fill caps" selected by accident, your curve will have caps inside its object. you will notice it, specially, when you convert that curve to a mesh object.
if you have a non-cyclic (opened) curve with a bevel object and you turn the Curve.resolution_u way up to an extreme value e.g.: 20000, your opened ends of the curve points to a strange angle. this angle alternates, when you in-/decrease that value slightly.

(3.) i know, these are two issues that happens by your own fault, but i think this is also related to an other issue
maybe fixing these two issues will fix the third as well...

http://projects.blender.org/tracker/index.php?func=detail&aid=34464

please watch this video, it will show all three issues...
http://www.sendspace.com/file/gm0487

the most visible issue is that with the intel GPU and the strange lines only appear on closed cyclic curves with bevel - it disappear immediately when i convert that curve to a mesh object.
the two issue with the caps of the curve.
- Steps for others to reproduce the error (preferably based on attached .blend file) ---
  to 1.
  open the attached blend file "issue - caps on cyclic curve1.blend"
  with the cyclic curve selected (be sure the "fill caps" option is checked)
  and hit [Alt]+- to convert the selected curve to mesh...
  ... in wireframe mode, you can see, that inside the object are caps inserted.

to 2.
open the attached blend file "issue - caps on open curve2.blend"
with the opened curve selected,
play a bit with an very high value of Curve.resolution_u 19000..20000 (you have to click in this field, to be able to putin such an extreme high value)...
... you will see, how the angle of the curves cap will flip/wobble.

(to 3. this issue happends only on use with internal GPU of intel i3770 CPU. most of you can not see/reproduce that issue)%%%

%%%--- Operating System, Graphics card --- Windows 64 SP1 64bit, intel i3770 internal GPU - Blender version with error, and version that worked --- blender-2.65a-windows64.zip - with issues blender-2.66a-windows64.zip - with issues blender-2.66-r56175-win64.zip - with issues - Short description of error --- two issues in modeling (and one maybe indirect related to the GPU) 1. if you have a cyclic curve with a bevel object and you have "fill caps" selected by accident, your curve will have caps inside its object. you will notice it, specially, when you convert that curve to a mesh object. 2. if you have a non-cyclic (opened) curve with a bevel object and you turn the Curve.resolution_u way up to an extreme value e.g.: 20000, your opened ends of the curve points to a strange angle. this angle alternates, when you in-/decrease that value slightly. (3.) i know, these are two issues that happens by your own fault, but i think this is also related to an other issue maybe fixing these two issues will fix the third as well... http://projects.blender.org/tracker/index.php?func=detail&aid=34464 please watch this video, it will show all three issues... http://www.sendspace.com/file/gm0487 - the most visible issue is that with the intel GPU and the strange lines only appear on closed cyclic curves with bevel - it disappear immediately when i convert that curve to a mesh object. - the two issue with the caps of the curve. - Steps for others to reproduce the error (preferably based on attached .blend file) --- to 1. open the attached blend file "issue - caps on cyclic curve1.blend" with the cyclic curve selected (be sure the "fill caps" option is checked) and hit [Alt]+- [x] to convert the selected curve to mesh... ... in wireframe mode, you can see, that inside the object are caps inserted. to 2. open the attached blend file "issue - caps on open curve2.blend" with the opened curve selected, play a bit with an very high value of Curve.resolution_u 19000..20000 (you have to click in this field, to be able to putin such an extreme high value)... ... you will see, how the angle of the curves cap will flip/wobble. (to 3. this issue happends only on use with internal GPU of intel i3770 CPU. most of you can not see/reproduce that issue)%%%

Alexander N. commented

2013-04-20 12:46:23 +02:00

Changed status to: 'Open'

Ton Roosendaal commented

2013-04-20 12:52:24 +02:00

%%%I don't know why we allow such extreme subdivision for curves in the first place... 100 would be a very sane max for ui.

Skipping caps for cyclic curves is a simple fix.%%%

%%%I don't know why we allow such extreme subdivision for curves in the first place... 100 would be a very sane max for ui. Skipping caps for cyclic curves is a simple fix.%%%

Alexander N. commented

2013-04-20 13:25:17 +02:00

%%%i only was using that high value for resolution_u and wrong using of "fill caps" only to figure out some possible reasons,
how and why that strange lines appease on my i3770 (HD4000) only while the object is a curve, and disappear immediately as soon i convert that object to a mesh.

so these were my candidates

the caps in cyclic curves - (not only when the fill caps option is checked - it looks like there is something else going on like this, even that option is unchecked).
what is different on drawing a curve with bevel and drawing a mesh with the exact same vertices/edges in the 3D view (by convert to mesh) - on curves i have visible issues, on mesh not.

and that with the cap ends on opened curves - maybe there is something else incorrect programmed/handled generally, that isn't appearing on small common values, but goes out of control on extreme situations - perhaps there are other things affected from, that will be fixed, when that is fixed...%%%

%%%i only was using that high value for resolution_u and wrong using of "fill caps" only to figure out some possible reasons, how and why that strange lines appease on my i3770 (HD4000) only while the object is a curve, and disappear immediately as soon i convert that object to a mesh. so these were my candidates - the caps in cyclic curves - (not only when the fill caps option is checked - it looks like there is something else going on like this, even that option is unchecked). - what is different on drawing a curve with bevel and drawing a mesh with the exact same vertices/edges in the 3D view (by convert to mesh) - on curves i have visible issues, on mesh not. and that with the cap ends on opened curves - maybe there is something else incorrect programmed/handled generally, that isn't appearing on small common values, but goes out of control on extreme situations - perhaps there are other things affected from, that will be fixed, when that is fixed...%%%

Alexander N. commented

2013-04-20 15:58:52 +02:00

%%%an additional comment to my previous one...
the strange line issue disappear also when i toggle from cyclic to an open one. so it is maybe only partially an issue of the GPU, but also an issue of the curve draw procedure.
%%%

%%%an additional comment to my previous one... the strange line issue disappear also when i toggle from cyclic to an open one. so it is maybe only partially an issue of the GPU, but also an issue of the curve draw procedure. %%%

Sergey Sharybin commented

2013-04-22 11:29:32 +02:00

%%%I've fixed caps+cyclic issue in svn rev56200. Also clamped hard limit of resolution to 1024. 20K for resolution is incredible insane!

As for that issue you had with lined -- it is just intel's driver failure,nothing to do from blender side. We have the same issue on linux and issue was reported to Mesa bug tracker couple of years ago. Nothing was fixed since then..

Thanks for the report, nothing else i could fix here, so closing.%%%

%%%I've fixed caps+cyclic issue in svn rev56200. Also clamped hard limit of resolution to 1024. 20K for resolution is incredible insane! As for that issue you had with lined -- it is just intel's driver failure,nothing to do from blender side. We have the same issue on linux and issue was reported to Mesa bug tracker couple of years ago. Nothing was fixed since then.. Thanks for the report, nothing else i could fix here, so closing.%%%

Sergey Sharybin commented

2013-04-22 11:29:32 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2013-04-22 11:29:32 +02:00

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two other issues with curve caps #35039