Shaders/SkinnedMesh/AlphaBlend_Additive_Scroll_Packed

Complex scrolling shader with MAINTEX_ON switch.

Parameters

• Scroll speed: ScrollSpeedBase
• UV tile: Base_Tile
• Texture: Diffuse_Texture (primary; shader may also use Main_Texture when MAINTEX_ON)
• Color tint: BaseMat_Tint (RGB color for the base layer)
• Alpha intensity: TintColor[3] (4th component is opacity multiplier, 0.0-1.0)
• Bloom: enabled

Extractor Handling

• Profile sets scroll speed, UV tile, diffuse texture, and bloom flag.
• ColorTintParam: Uses BaseMat_Tint for RGB color.
• AlphaIntensityParam: Uses TintColor - the 4th component is extracted as opacity multiplier.
• Treated as scrollable; no flipbook parameters.

Alpha Source Logic

The shader uses TintColor RGB as a mode discriminator:

TintColor RGB	Mode	Alpha Source	Example
White [1,1,1]	Normal	TintColor[3]	Jhin Scrolling01: 40% opacity
Non-white (gray/color)	Texture-as-Alpha	BaseMat_Tint[3]	Aurora Pattern: 65% opacity

Rationale:

• When TintColor RGB is white, the texture colors are used directly and TintColor[3] controls overall opacity.
• When TintColor RGB is non-white (gray/color), the texture is used as an alpha mask, and BaseMat_Tint[3] controls the final opacity.

Test Cases:

Skin	Material	TintColor	BaseMat_Tint	Expected Alpha
Jhin 202055	Scrolling01	[1,1,1,0.4]	[1,1,0.7,1]	0.4 (40%)
Aurora 893011	Pattern	[0.8,0.8,0.8,0.5]	[0.75,0.55,0.15,0.65]	0.65 (65%)
Karthus 30035	Pattern	[1,1,1,0.4]	[1,0.7,0.3,0.75]	0.4 (40%)

Tinted Alpha Mask (UseTextureAsAlpha)

Format used by "Aurora Pattern" (Aurora Skin 11) and similar materials.

Detection: TintColor RGB < 0.95 AND Additive blend mode

• Problem: The texture (grayscale pattern) is intended as an opacity mask, tinted by a color (e.g., Gold). Standard GLTF renders it as dark RGB.
• Extractor: Sets UseTextureAsAlpha = true in GLTF extras.
• Frontend:
  • Sets material.alphaMap = material.map (texture intensity → opacity).
  • Sets material.map = null (removes RGB contribution).
  • Sets material.transparent = true.
  • Tint color applied via material.color from GLTF baseColorFactor.

Frontend Expectations

• handleUvScroll uses ScrollSpeedBase; handleUvTile uses Base_Tile.
• Bloom-enabled material path.
• handleUseTextureAsAlpha manages the map-to-alphaMap swap.

Testing

• Verify scrolling speed/tiling applied correctly.
• Check bloom behavior and MAINTEX_ON variations render as expected.
• Aurora Skin11: Verify "Pattern" material appears as a transparent, gold-tinted scrolling pattern at 65% opacity.
• Jhin Skin55 (202055): Verify "Scrolling01/02" materials appear at ~40% opacity.
• Karthus Skin35 (30035): Verify "Pattern" material at 40% opacity, NOT using texture-as-alpha.