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IDProjectCategoryView StatusDate SubmittedLast Update
0002141opensim[REGION] Physics Enginespublic2008-09-07 03:042009-09-18 07:25
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PlatformOperating SystemOperating System Version
Product Version 
Target VersionFixed in Version 
Summary0002141: Walking on a sculpted prim is inconsistent especially if it is huge...
DescriptionIf you use the attached tga to set up a simple spherical sculpted prim you can see that it models a geographical region (data taken from external CAD from one architect).
The wanted measure should be 256x256x140 to simulate a mountain, but when doing that and walk on the mountain you feel yourself completely dug in the mountain for many meters, especially with high z-values.
Trying to adjust proportionally the z value when doing the Sculpt meshing solves this only partially, but the problem is still there.
You can see the problem EVEN without superprim just use a 10x10x10 and walk to the top you see you are sanded for around 20-30 cm, which scales to 6-10 meters with biggest scale.
TagsNo tags attached.
Git Revision or version number
Run ModeStandalone (1 Region)
Physics EngineODE
Script Engine
Environment.NET / Windows32
Mono Version
Attached Fileszip file icon [^] (679,396 bytes) 2008-09-07 03:04
? file icon cuneo.tga [^] (12,306 bytes) 2008-09-10 05:41
rar file icon cuneo_Sculpt.rar [^] (10,130 bytes) 2008-09-10 05:42
jpg file icon ScreenHunter_01 Sep. 10 14.32.jpg [^] (46,006 bytes) 2008-09-10 05:43

- Relationships
has duplicate 0002140closed Walking on a sculpted prim is inconsistent especially if it is huge... 

-  Notes
dahlia (administrator)
2008-09-07 19:53

It appears that the area where the "sanding" occurs is rendered in a very low resolution in the viewer, and there is probably a precision mismatch between the viewer and the physical mesh in this area. You may want to increase the resolution there, or spread the vertices represented by the sculpty texture out more evenly across the surface. Also the file is quite large; most sculpty textures are in the size range of 64x64 pixels in order to be allowed to upload without jpeg compression by the viewer, which can eliminate a major cause of distortion.

Note that physical sculpty meshing is an experimental feature and may not be suitable for high accuracy needs. Sculpted prims in general are also quite inaccurate.
salahzar (reporter)
2008-09-10 05:41

We have kept in investigating the issue. While sculpted prims are experimental, this is really an area where OpenSim is outperforming SecondLife, and we use this as an example on why opensim can be better than secondlife and offer people to choose.. :)
Apart from the "philosophical" aspect, I set up the SPAM define and passed the resulting .raw file to blender which gave me a clearer idea on why the meshing is wrong. To make things easier to follow I asked the original reporter to produce a simple wedge (just a slanted plane) uploaded it as a 64x64 lossless image as suggested by Dahlia and explored the resulting meshes on Blender.
Actually it seems that the wedge is badly rendered on the top, and especially on the left part. There appear to be at least 3 strides each one rendered in a subtle different way, being the first on the left rapidly climbing and so producing the effects of "sanding" but not in an expected progressive way.
Included are:
- the original tga of the wedge
- the raw file produced by the Meshmerizer.cs
- a photo of resulting wedge from Blender.

I would love to help in correcting this if anybody gives me some hints :)
mirceakitsune (reporter)
2008-10-31 04:58

Can agree. I have a giant megaprim sculptie island in the sky and there are parts of it where collisions are way above the surface and others where you fall through right in the middle of it and there are no collisions at all.
Fly-Man- (developer)
2009-09-18 07:25

This issue was automatically checked by Mantis Issue Check:

Feedback was added after original submit date

- Issue History
Date Modified Username Field Change
2008-09-07 03:04 salahzar New Issue
2008-09-07 03:04 salahzar File Added:
2008-09-07 03:04 salahzar SVN Revision => 6163
2008-09-07 03:04 salahzar Run Mode => Standalone (1 Region)
2008-09-07 03:04 salahzar Physics Engine => ODE
2008-09-07 03:04 salahzar Environment => .NET / Windows32
2008-09-07 12:13 HomerHorwitz Relationship added has duplicate 0002140
2008-09-07 19:53 dahlia Note Added: 0005084
2008-09-10 05:41 salahzar Note Added: 0005141
2008-09-10 05:41 salahzar File Added: cuneo.tga
2008-09-10 05:42 salahzar File Added: cuneo_Sculpt.rar
2008-09-10 05:43 salahzar File Added: ScreenHunter_01 Sep. 10 14.32.jpg
2008-10-31 04:58 mirceakitsune Note Added: 0006733
2009-09-18 07:25 Fly-Man- Note Added: 0013439
2009-09-18 07:25 Fly-Man- Status new => feedback

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