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Issue Details (XML | Word | Printable)

Key: VWR-504
Type: Bug Bug
Status: Open Open
Priority: Normal Normal
Assignee: Unassigned
Reporter: beatfox xevious
Votes: 63
Watchers: 6
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1. Second Life Viewer - VWR

Alpha-sort behavior of prims in attachments is incorrect.

Created: 23/Apr/07 01:16 AM   Updated: 20/Jun/08 12:32 PM
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Component/s: Avatar/Character, Graphics
Affects Version/s: 1.14.0.x, 1.15.0.x, 1.15.1.x, 1.16.0.x, 1.17.0.x, 1.18.3 Release Candidate, 1.18.0, 1.18.1.2, 1.18.2.0
Fix Version/s: None

File Attachments: None
Image Attachments:

1. Bad Hair Day.jpg
(176 kB)

2. rendering order.jpg
(85 kB)

3. screenshot-1.jpg
(383 kB)
Environment: Windows XP Home, NVIDIA GeForce 7600 GT
Issue Links:
Relates

Linden Lab Issue ID: SL-41517


 Description  « Hide
Steps to reproduce the bug:
1) Obtain any light-colored Luskwood Creatures Fennec avatar (so you can clearly see the eyebrows).
2) Rez the fennec head on the ground in front of you, and look at it from various angles. Try turning it in different directions. Notice that the eyebrows always render on top of the head sphere as long as the camera is placed so that the eyebrow prim is closer to it than the head sphere (i.e. camera is "in front of" the head).
3) Wear the fennec head and look at it from various angles. Repeat, turning your avatar in different directions.

Observed results: The alpha-sort order of the eyebrow prim and head sphere is no longer correct. It seems to vary based on the direction the avatar is facing.

Expected results: The alpha-sort behavior should be the same for attachments as it is for unattached objects.

UPDATE 4/24/07: Here's some additional clarification. The prims in an attachment only seem to sort the proper way when the avatar is facing directly south. When the av faces any other direction, the surfaces are alpha sorted as if the avatar were facing south. For example (using the fennec head), if the avatar faces south, and the camera is placed south of the avatar (facing north towards the avatar), the eyebrows render on top of the head prim. But if the avatar faces north, and the camera is placed north of the avatar (facing south towards the avatar), the head prim renders on top of the eyebrows - which would normally be the case if the av were facing south. Regardless of the avatar's orientation, the eyebrows render on top if and only if the camera is placed south of the avatar.



 All   Comments   Change History      Sort Order: Ascending order - Click to sort in descending order
vaughn deluca added a comment - 27/Apr/07 03:48 AM
I am not at al sure this is the same issue, but attach the screenshot anyhow.
This pool edege was rezzed at 220 meters, just above the cloud zone
The clouds in the background are rendered inn front of the weeds, but behind the stones, creating sharp edges and a disturbing discontinues view.

beatfox xevious added a comment - 28/Apr/07 05:59 PM
Not really the same issue, Vaughn. Alpha sorting in general is a problematic business, but this particular bug is referencing an alpha-sort problem specific to avatar attachments - they're not sorting by the same rules as unattached objects, and they should be.

Stelard Kyomoon added a comment - 03/May/07 01:31 AM
I get this issue too, with my hair and tail, and eyes when I try to use my independant eyes head.
I have noticed this problem even when the objects in question were not attached to my avatar.
I am using Windows XP x64 with the latest drivers for my nVidia GeForce 8800 GTX.

Bloodsong Termagant added a comment - 11/May/07 06:15 PM
as far as i can see. ALL alpha sorting as of 1.15 is now done backwards. ie: things furthest away are rendered on top and things closer are rendered 'behind.' do we really need to open a new issue for this?

ari blackthorne added a comment - 06/Jul/07 06:43 AM
Not just attachments. My builds look funky when prims in front of or behind a transparent (alpha-based) or semi-transparent prim turn completely invisible when viewed from certain angles (slightly off-center to aout 80-degrees left or right)

This is do frekin irritating because customers are wondering why my builds are doing it, thinking it is sloppy work.

Please vote for this one.


Patrice Fierrens added a comment - 27/Sep/07 05:07 PM
Added Screenshot showing the issue with hair. Avatar is looking north, doesn't happen when looking south. Prims from the back are getting rendered in the front.

Naoki Ninetails added a comment - 29/Jan/08 09:38 AM
Posted a screenshot (like anyone doesn't know what this looks like by now).

Please, please, please make this issue priority number one. I know it's "always tricky" but it's the most off-putting thing about SL for me.


lordvore voom added a comment - 20/Jun/08 12:32 PM
This is still not fixed....Pretty much all my hairstyles, my wolf avatar, cat avatar (which both have hair texturing) any wings based on a single texture overlap textures so badly that they become incomprehensible yet I have a top of the range Geforce graphics card...It occurs with prim eyelashes to...Backfaces become visible through overlapping textures.

I remember this being patched to work in Quake2...That was some time ago now.