What is this “alpha glitch” thing?
While SL has many different type of alpha issues, this fix is for when two rigged meshes with alpha textures make each other go invisible. For instance, your see-through dress may break your fishnet stockings, or your hair may make your top go invisible.
You used to be able to fix this by using bump and specular maps to assign priorities, but LL replaced it with a new method.
How do you fix the alpha glitching now?
There are two things that decide the priority: the attachment point, and the root prim transparency.
Let me explain. LL recently added priority to each attachment point, here is a breakdown of what priority each bone has. Please note that the lower the number, the higher the priority:
1 - Chest
2 - Skull
3 - Left Shoulder
4 - Right Shoulder
5 - Left Hand
6 - Right Hand
7 - Left Foot
8 - Right Foot
9 - Spine
10 - Pelvis
11 - Mouth
12 - Chin
13 - Left Ear
14 - Right Ear
15 - Left Eyeball
16 - Right Eyeball
17 - Nose
18 - R Upper Arm
19 - R Forearm
20 - L Upper Arm
21 - L Forearm
22 - Right Hip
23 - R Upper Leg
24 - R Lower Leg
25 - Left Hip
26 - L Upper Leg
27 - L Lower Leg
28 - Stomach
29 - Left Pec
30 - Right Pec
31 - [HUD] Center 2
32 - [HUD] Top Right
33 - [HUD] Top
34 - [HUD] Top Left
35 - [HUD] Center
36 - [HUD] Bottom Left
37 - [HUD] Bottom
38 - [HUD] Bottom Right
39 - Neck
40 - Avatar Center
41 - Left Ring Finger
42 - Right Ring Finger
43 - Tail Base
44 - Tail Tip
45 - Left Wing
46 - Right Wing
47 - Jaw
48 - Alt Left Ear
49 - Alt Right Ear
50 - Alt Left Eye
51 - Alt Right Eye
52 - Tongue
53 - Groin
54 - Left Hind Foot
55 - Right Hind Foot
Example: if you want to wear alpha hair with an alpha top, then you can attach the hair to your skull (priority 2) attachment point while attaching your top to the spine (priority 9). This way your hair won’t make your top go invisible. This has endless uses both for creators and residents, and can easily be switched up by anyone who want to change priority within their outfit. But there’s a catch, there’s also the matter of the blending options on the root prim:
While I have done limited testing on all the aspects around this, I can say for sure that a root prim that has transparency of more than 1% (including 100%), has a higher priority than a root prim with alpha masking or no alpha. This means that if your hair on the skull (priority 2) attachment point doesn’t have a transparent root prim, it will still glitch with your top on the spine (priority 9) attachment point.
I believe this means all rigged mesh with alpha textures would benefit from having a root prim with transparency, as this gives the user freedom to configure their outfit freely.
Important:
While the attachment point priority changes have been confirmed as an intentional change and should stick around going forward, the root prim transparency part is not confirmed. This means that it might not remain true in the future.
Making your root prim 100% transparent instead of just partially transparent will help reduce lag.
This fix is only relevant for rigged/fitted/bento mesh, and will not work with anything unrigged/resize.
Please share this information as we all benefit from more people knowing about this
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