# Authored original MilkyWayPlane

Source image4.4.2.0 SHA256
`6891f70a021fa9f3a0e00458c284f48d1226e68ae7fc02ad48081aed47857e93`.
All analysis is offline; no game calls, running memory or fabricated stars.

## Shader identity, including its non-obvious alias

The material in bundle19b9e393c96329f63707aeade6a46e8cf3b71398 names
Alpha_UnlitNoScale_StarMapFacingAlpha_NearFade. Its actual vertex shader has
the unrelated-looking alias
`vs_Alpha_FresnelDiffuseLinearToGammaSpace_AntialiasClipOnColourAlpha_Forward0_0_0_Win64_SM50`.
It is proven by native loader4FA720's five-uint key matching, not by proximity,
similar names, or a matching signature.

The loader indexes ahsd3f record fields10/14/18/1C/20, then resolves the second
frozen effect object's20-byte key table(+58 pointer/+60 count) into shader slots
at firstFrozen+48. `Extract-GalaxyEffectShaderLinks.py` repeats this against all897
shader records and exports the precise Plane, Core and MW/Dust associations.
The previously considered generic Alpha_UnlitNoScale VS has an incompatible
signature and is not used.

## Original geometry and instance data

The original plane is4 packed vertices and6 indices in vertex format8,40 bytes
per vertex. The original indices are0,1,2,2,3,0. Input-definition builder4C84400
constructs packedVertexDataA/B/C with total stride40. Its two16-byte fields and
final8-byte field place the used attributes at0/16/32. The vertex shader decodes
position from A.xyz, normal from A.z's three low bytes, and UV from B.x's two
u16 values. Bone indices/weights C.xy are skipped for this unskinned instance.

Actual Galaxy initializer3A5BAF0→3B067D0→3C14920 creates model-array index1,
scale100000, basis(-X,+Y,-Z), original centre(50000,40955,50000).3C14920 calls
scale setter7B6E20;3B067D0 installs its source basis and translation.

The actual336-byte GPU instance producer is4350170; its only append target
434FE20 copies the whole150hex-byte record. It divides basis by model scale,
extracts and normalises quaternion(0,1,0,0), then packs `(q+1)*32767` with
cvtps2dq and u16 extraction. The scale comes from unbacked global6054BF0,
whose initialization is independently proven: leaf14FFF0 loads float32767
from5A72C60, broadcasts it and stores6054BF0. Its CRT pointer is4DDE7C0.
The packed result is32767/65534/32767/32767. The source initializer4C861B0
sets the unskinned palette base to0;4350170 overwrites position/scale/quat.

The original DXBC prints both decode coefficients as.000031. Their exact bits
matter: UV/quaternion uses38000100 (1/32767), while the radial position branch
uses38000080 (2/65535). Using the latter for UV or quaternion caused a real
original-VS/PS image comparison failure and was corrected. The production port
preserves the actual packed quaternion decode, rather than assuming a generic
UNorm16 convention.

## Texture and pixel shader

`Build-OriginalGalaxyPlane.py` verifies source hashes, CRT instructions, decode
coefficients and texture format table4E2E500. Source format108 is DXGI99,
BC7_UNorm_sRGB. The exact2048² texture retains all12 padded mips,5596160 bytes,
SHA256`e3643ba432b84d2c34ca512122133559a813bbb80545fcd1c03c87087a7f4cde`.
The complete packed mesh is196 bytes, SHA256
`ceb482f68e17a1d05cd8c36f488ee1d46bc003e8eed290284e83fb5a73dec743`.

The PS emits textureRGB×.946×HDRWrite. Alpha is textureAlpha multiplied by
`abs(dot(-normalisedRay,normalisedNormal))^.917` and
`saturate((forwardDepth-1772.40698)/14392.19043)`. These are the named source
material values, independently consistent with the two original PS CB2 vectors.
The compiled state bytecode copies actual material Src4/Dest5/Op0, so it uses
SourceAlpha/InverseSourceAlpha/Add for RGB and alpha. The authored render layer
is1, versus Core10 and MW13. Full frame scheduling/runtime overrides remain
independently unobserved; `OriginalPlaneFullRestored` stays false.

## Independent GPU verification

`research/GalaxyPlaneShaderProbe` binds the actual original packed vertices,
336-byte instance and linked original VS+PS. It compares them against the new
decoded-mesh/VS/PS port in an R32 render target. Sol, centre and above each run
with Write1 and1/256: no nonfinite values, no component error above.005,
maximum difference.000582, mean below1e-6. The three generated images have been
viewed. The plane is nearly transparent when viewed within its plane, as its
source facing/near fade dictates; above it shows the authored spiral texture.

The production partial is independent, b9/t18/s3, with an explicit optional
HDRWrite argument. It does not add point stars. The two resource/packing tests
also pass. Actual application integration/visual acceptance is a separate check.