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+# KHR\_materials\_scatter
+
+## Contributors
+
+- Mike Bond, Adobe [@miibond](https://github.com/MiiBond)
+- Tobias Haeussler, Dassault Systèmes [@proog128](https://github.com/proog128)
+- Bastian Sdorra, Dassault Systèmes [@bsdorra](https://github.com/bsdorra)
+
+Copyright 2025 The Khronos Group Inc. All Rights Reserved. glTF is a trademark of The Khronos Group Inc.
+See [Appendix](#appendix-full-khronos-copyright-statement) for full Khronos Copyright Statement.
+
+## Status
+
+Draft
+
+## Dependencies
+
+Written against the glTF 2.0 spec. This extension has no effect unless combined with `KHR_materials_transmission`. Optionally combined with `KHR_materials_volume` to activate volumetric scattering mode.
+
+## Exclusions
+
+- This extension must not be used on a material that also uses `KHR_materials_pbrSpecularGlossiness`.
+- This extension must not be used on a material that also uses `KHR_materials_unlit`.
+- This extension must not be used on a material that also uses `KHR_materials_diffuse_transmission`.
+
+## Table of Contents
+
+- [KHR\_materials\_scatter](#khr_materials_scatter)
+ - [Contributors](#contributors)
+ - [Status](#status)
+ - [Dependencies](#dependencies)
+ - [Exclusions](#exclusions)
+ - [Table of Contents](#table-of-contents)
+ - [Overview](#overview)
+ - [Extending Materials](#extending-materials)
+ - [Properties](#properties)
+ - [Modes of Operation](#modes-of-operation)
+ - [Thin-Walled Mode](#thin-walled-mode)
+ - [Volumetric Mode](#volumetric-mode)
+ - [Scattering Parameters](#scattering-parameters)
+ - [Scatter Strength](#scatter-strength)
+ - [Multi-Scatter Color](#multi-scatter-color)
+ - [Scatter Anisotropy](#scatter-anisotropy)
+ - [Material Structure Updates](#material-structure-updates)
+ - [Thin-Walled Mode](#thin-walled-mode-1)
+ - [Volumetric Mode](#volumetric-mode-1)
+ - [Interaction with Other Extensions](#interaction-with-other-extensions)
+ - [KHR\_materials\_transmission](#khr_materials_transmission)
+ - [KHR\_materials\_volume](#khr_materials_volume)
+ - [KHR\_materials\_ior](#khr_materials_ior)
+ - [Schema](#schema)
+ - [References](#references)
+ - [Appendix: Full Khronos Copyright Statement](#appendix-full-khronos-copyright-statement)
+
+## Overview
+
+Light that enters a material can be scattered before it exits, producing effects from the bright subsurface glow of skin and wax to the hazy translucency of frosted glass. The character of this scattering depends on whether the object is modeled as a thin surface or as a solid volume. `KHR_materials_scatter` is a unified scattering extension that works in both contexts.
+
+When used with a thin-walled material (no `KHR_materials_volume`, or `thicknessFactor = 0`), it converts the specular transmission lobe defined by `KHR_materials_transmission` into a linear interpolation between a diffuse transmission lobe and diffuse reflection lobe based on scatter anisotropy. When applied to a volumetric material (`KHR_materials_volume` with `thicknessFactor > 0`), it adds volumetric scattering to the medium, augmenting the pure-absorption model of `KHR_materials_volume`. This scattering can be adjusted to be more forward or backward scattering using the anisotropy parameter. In all contexts, the `scatterStrength` parameter controls the amount of scattering.
+
+
+
+Left: thin-walled mode — scatter converts the specular BTDF into a diffuse BTDF at the surface. Right: volumetric mode — scatter adds a scattering coefficient to the interior of the volume.
+
+
+## Extending Materials
+
+The scattering properties are defined by adding the `KHR_materials_scatter` extension to any glTF material that also uses `KHR_materials_transmission`.
+
+**Thin-walled example** — a leaf or sheet of paper:
+
+```json
+{
+ "materials": [
+ {
+ "extensions": {
+ "KHR_materials_scatter": {
+ "multiscatterColorFactor": [0.8, 0.9, 0.7],
+ "scatterAnisotropy": 0.3
+ },
+ "KHR_materials_transmission": {
+ "transmissionFactor": 1.0
+ }
+ }
+ }
+ ]
+}
+```
+
+**Volumetric example** — a candle or translucent wax figure:
+
+```json
+{
+ "materials": [
+ {
+ "extensions": {
+ "KHR_materials_scatter": {
+ "multiscatterColorFactor": [0.8, 0.6, 0.5],
+ "scatterAnisotropy": 0.2
+ },
+ "KHR_materials_transmission": {
+ "transmissionFactor": 1.0
+ },
+ "KHR_materials_volume": {
+ "thicknessFactor": 1.0,
+ "attenuationDistance": 0.01,
+ "attenuationColor": [0.95, 0.85, 0.75]
+ }
+ }
+ }
+ ]
+}
+```
+
+## Properties
+
+| | Type | Description | Required |
+|------------------------------|------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------|----------------------------|
+| **scatterStrengthFactor** | `number` | The strength of the scattering effect. Range is [0, 1]. At 0, scattering is disabled; at 1, scattering is fully applied. | No, default: `0` |
+| **scatterStrengthTexture** | [`textureInfo`](https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#reference-textureinfo) | A texture that defines the per-texel scatter strength, stored in the alpha (A) channel. Will be multiplied by `scatterStrengthFactor`. | No |
+| **multiscatterColorFactor** | `number[3]` | The multi-scatter color. In volumetric mode, this is the multi-scatter albedo. In thin-walled mode, this is a surface tint applied to transmitted light. | No, default: `[1, 1, 1]` |
+| **multiscatterColorTexture** | [`textureInfo`](https://www.khronos.org/registry/glTF/specs/2.0/glTF-2.0.html#reference-textureinfo) | A texture that defines the multi-scatter color, stored in the RGB channels and encoded in sRGB. This will be multiplied by the `multiscatterColorFactor`. | No |
+| **scatterAnisotropy** | `number` | The anisotropy of scatter events. Range is (-1, 1). Positive values represent forward scattering; negative values represent backward scattering. | No, default: `0` |
+
+## Modes of Operation
+
+The mode is determined by the presence and configuration of `KHR_materials_volume`.
+
+### Thin-Walled Mode
+
+A material is in thin-walled mode when `KHR_materials_volume` is absent, or when `KHR_materials_volume` is present with `thicknessFactor = 0`. In this mode, `KHR_materials_scatter` modifies the surface BSDF:
+
+- `scatterStrength` linearly interpolates between the specular BTDF (at 0) and a diffuse scatter BSDF (at 1). The BTDF uses the `baseColor` as the multiplier and the BSDF uses `multiscatterColor`.
+- `multiscatterColor` is the color of the fully-scattered lobe.
+- `scatterAnisotropy` controls the directional split of scattered light between the two hemispheres. At `+1`, all scattered light is transmitted forward (pure diffuse BTDF). At `-1`, all scattered light is reflected back (pure diffuse BRDF), making the surface appear opaque and Lambertian with albedo defined by `multiscatterColor`. At `0`, scattered light is split equally between reflection and transmission.
+
+The thin-walled mode is appropriate for thin objects with dense internal structure, such as leaves, fabric, paper, wax sheets, or frosted glass panels.
+
+### Volumetric Mode
+
+A material is in volumetric mode when `KHR_materials_volume` is present with `thicknessFactor > 0`. In this mode, `KHR_materials_scatter` adds volumetric scattering to the interior of the medium:
+
+- `scatterStrength` effectively scales the multi-scatter albedo. At 0, the multi-scatter albedo becomes black so there is no scattering (i.e. the medium is purely absorbing, as in `KHR_materials_volume` alone); at 1, the full `multiscatterColor` albedo is used to split attenuation between absorption and scattering. See below for more details.
+- `multiscatterColor` defines the multi-scatter albedo, representing the perceived color of the scattering medium after many internal bounces.
+- `scatterAnisotropy` controls the single-parameter phase function for individual scattering events. At `-1`, all scattering events are backscattering and, at `+1`, all events are forward scattering.
+
+The volumetric mode is appropriate for thick objects with participating media, such as wax candles, skin, milk, or colored glass with subsurface color.
+
+## Scattering Parameters
+
+### Scatter Strength
+
+`scatterStrength` is the primary on/off and blending control for the extension. Its evaluation is the same in both modes:
+
+```
+scatterStrength = scatterStrengthFactor * scatterStrengthTexture.a
+```
+
+When no `scatterStrengthTexture` is provided, `scatterStrength = scatterStrengthFactor`. The alpha channel is used so that `scatterStrengthTexture` can share a texture object with `multiscatterColorTexture`, packing the scatter strength into the unused alpha channel of the RGB scatter color. The resulting `scatterStrength` value drives the interpolation described in each mode's [Material Structure Updates](#material-structure-updates) section below. At `scatterStrength = 0` the material behaves exactly as if `KHR_materials_scatter` were not present. At `scatterStrength = 1` the full scattering effect is applied.
+
+### Multi-Scatter Color
+
+The evaluation of `multiscatterColor` is:
+```
+multiscatterColor = multiscatterColorFactor * sampleLinear(multiscatterColorTexture).rgb
+```
+
+However, the behaviour differs between the two modes:
+
+**Thin-walled mode:** `multiscatterColor` is a multiplicative tint on the transmitted light. A value of `[1, 1, 1]` (the default) applies no tint — all wavelengths are transmitted equally. Lower values attenuate specific color channels, making the surface absorb those frequencies.
+
+**Volumetric mode:** `multiscatterColor` is the multi-scatter albedo $\rho_{ms}$ as defined by [Kulla and Conty (2017)](#KullaConty2017). It is a more intuitive parameterization of the scattering albedo because it corresponds to the perceived color of the medium after many bounces, rather than the single-scatter albedo that directly parameterizes the scattering coefficient.
+
+The single-scatter albedo $\rho_{ss}$ is derived from the multi-scatter albedo $\rho_{ms}$ and the anisotropy $g$ as:
+
+$$
+\begin{aligned}
+s &= 4.09712 + 4.20863\,\rho_{ms} - \sqrt{9.59217 + 41.6808\,\rho_{ms} + 17.7126\,\rho_{ms}^2}
+\\\\
+\rho_{ss} &= \frac{1 - s^2}{\left(1.0 - g * s * s\right)}
+\end{aligned}
+$$
+
+The single-scatter albedo defines the fraction of the attenuation coefficient that goes to scattering versus absorption.
+Given the attenuation coefficient $\sigma_t = -\log(c)/d$ from `KHR_materials_volume`, the scattering and absorption coefficients are:
+
+$$
+\sigma_s = \sigma_t\,\rho_{ss}, \\\\ \qquad \sigma_a = \sigma_t\,(1 - \rho_{ss})
+$$
+
+> [!NOTE]
+> In volumetric mode, `multiscatterColor` is a volume property. When textured, each texel in the 2D surface map competes to define the volume's multi-scatter albedo. This violates reciprocity in path tracing, causing the integration result to vary with view and light direction. Because of this, textured `multiscatterColor` is most appropriate for densely-scattering media. Use with care.
+
+
+
+A diffuse-only material (left) and a material with dense volumetric scattering (right), both set to the same apparent color. The multi-scatter albedo mapping ensures a consistent perceived color despite the different rendering modes.
+
+
+### Scatter Anisotropy
+
+**Thin-walled mode:** `scatterAnisotropy` controls how scattered light is split between the reflected and transmitted hemispheres. At `+1`, all scattered energy exits through the transmission hemisphere (pure diffuse BTDF — tissue paper, thin wax). At `-1`, all scattered energy exits through the reflection hemisphere (pure diffuse BRDF — the surface appears opaque and Lambertian with `multiscatterColor`). At `0`, energy is split equally between the two hemispheres.
+
+**Volumetric mode:** `scatterAnisotropy` controls the single-parameter phase function which determines the probability that light is scattered forward or backwards.`scatterAnisotropy = 0` gives isotropic scattering; `scatterAnisotropy > 0` gives forward scattering (light continues in roughly the same direction); `scatterAnisotropy < 0` gives backward scattering.
+
+
+
+
+
+
+
+
+
g = -0.95
+
g = 0.0
+
g = 0.95
+
+
+
+ Top-lit, dense scattering medium in volumetric mode for different scatter anisotropy values.
+
+
+
+
+## Material Structure Updates
+
+*This section is normative.*
+
+### Thin-Walled Mode
+
+In thin-walled mode, `KHR_materials_scatter` modifies the `dielectric_brdf` defined in [Appendix B](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#material-structure) as extended by `KHR_materials_transmission`:
+
+```
+dielectric_brdf =
+ fresnel_mix(
+ ior = 1.5,
+ base = mix(
+ diffuse_brdf(color = baseColor),
+ specular_btdf(α = roughness^2) * baseColor,
+ transmission),
+ layer = specular_brdf(α = roughness^2)
+ )
+```
+
+to the following:
+
+```
+scatterStrength = scatterStrengthFactor * scatterStrengthTexture.a
+
+dielectric_brdf =
+ fresnel_mix(
+ ior = 1.5,
+ base = mix(
+ diffuse_brdf(color = baseColor),
+ mix(
+ specular_btdf(α = roughness^2) * baseColor,
+ scatter_bsdf(color = multiscatterColor, g = scatterAnisotropy),
+ scatterStrength),
+ transmission),
+ layer = specular_brdf(α = roughness^2)
+ )
+```
+
+where `scatter_bsdf` is a full diffuse BSDF that distributes scattered energy across both hemispheres according to `scatterAnisotropy`. The forward fraction `(1 + g) / 2` exits through the transmission hemisphere; the backward fraction `(1 - g) / 2` exits through the reflection hemisphere:
+
+```
+function scatter_bsdf(color, g) {
+ forwardFraction = (1 + g) / 2
+ backwardFraction = (1 - g) / 2
+ if (view and light on opposite hemispheres) {
+ return (1/pi) * forwardFraction * color
+ } else {
+ return (1/pi) * backwardFraction * color
+ }
+}
+```
+
+At `g = +1`, `scatter_bsdf` is a pure Lambertian BTDF. At `g = -1`, it is a pure Lambertian BRDF, making the surface opaque with diffuse color `multiscatterColor`. At `g = 0`, energy is split equally between the two hemispheres.
+
+At `scatterStrength = 0`, the inner `mix` collapses to `specular_btdf * baseColor`, recovering plain `KHR_materials_transmission` behaviour. At `scatterStrength = 1`, only `scatter_bsdf(multiscatterColor, g)` remains. The amount of transmission is still gated by `transmissionFactor` from `KHR_materials_transmission`.
+
+### Volumetric Mode
+
+In volumetric mode, `KHR_materials_scatter` does not modify the surface BSDF. The surface BSDF remains as defined by `KHR_materials_transmission` and `KHR_materials_volume`. Instead, this extension augments the volume transport by introducing a non-zero scattering coefficient $\sigma_s$, which was assumed to be zero in `KHR_materials_volume`.
+
+With `KHR_materials_volume` alone:
+
+$$
+\begin{aligned}
+\sigma_t &= \sigma_a, \\\\ \qquad \sigma_s &= 0
+\end{aligned}
+$$
+
+With `KHR_materials_scatter` added:
+
+$$
+\begin{aligned}
+\sigma_t &= \sigma_a + \sigma_s, \\\\ \qquad \sigma_s &= \sigma_t\,\rho_{ss}(\rho_{ms}^*)
+\end{aligned}
+$$
+
+where the effective multi-scatter albedo $\rho_{ms}^*$ is scaled by `scatterStrength`:
+
+$$
+\begin{aligned}
+\rho_{ms}^* &= \mathtt{scatterStrength} \times \rho_{ms}, \qquad \\\\ \mathtt{scatterStrength} &= \mathtt{scatterStrengthFactor} \times \mathtt{scatterStrengthTexture.a}
+\end{aligned}
+$$
+
+$\rho_{\text{ms}}$ is derived from `multiscatterColorFactor` (and `multiscatterColorTexture`) as described in [Multi-Scatter Color](#multi-scatter-color) above, and $\rho_{\text{ss}}$ is derived from $\rho_{\text{ms}}^*$ via the Kulla-Conty mapping. At `scatterStrength = 0`, $\rho_{\text{ms}}^* = 0$ and therefore $\rho_{\text{ss}} = 0$, giving a purely absorbing medium identical to `KHR_materials_volume` alone. $\sigma_{\text{t}}$ now accounts for both absorption and scattering, not absorption alone.
+
+## Interaction with Other Extensions
+
+### KHR\_materials\_transmission
+
+`KHR_materials_transmission` is required for `KHR_materials_scatter` to have any visible effect:
+
+- In thin-walled mode, `transmissionFactor` controls the fraction of the base layer that is scattered through the surface. Setting `transmissionFactor = 1.0` and using `KHR_materials_scatter` fully replaces the specular BTDF with a diffuse one.
+- In volumetric mode, `transmissionFactor` controls the fraction of light allowed to enter the volume. Without any transmission, the volume interior is unreachable.
+
+### KHR\_materials\_volume
+
+`KHR_materials_volume` determines which mode `KHR_materials_scatter` operates in:
+
+- When absent (or `thicknessFactor = 0`): thin-walled mode.
+- When present with `thicknessFactor > 0`: volumetric mode.
+
+For renderers that do not support full volumetric rendering, it is acceptable to approximate volumetric mode using thin-walled mode behavior. In particular, for materials with very short scattering distances relative to their size (dense subsurface), the visual difference is small and the thin-walled diffuse approximation is efficient and widely applicable. Ray-tracers should use the actual geometry to compute path lengths through the volume rather than relying on `thicknessFactor`.
+
+### KHR\_materials\_ior
+
+When `KHR_materials_ior` is present, it sets the IOR for Fresnel calculations at the surface boundary. This applies regardless of scatter mode. In volumetric mode, the IOR also governs refraction of transmitted rays per the definitions in `KHR_materials_volume`.
+
+## Implementation
+
+**This section is non-normative**
+
+### Anisotropic Phase Function
+A very common single-channel phase function in wide use is the Henyey-Greenstein phase function, $p(\mathbf{v}, \mathbf{l}; g)$, which determines the probability density of outgoing directions $\mathbf{l}$ given an incident direction $\mathbf{v}$ at each volumetric scattering event:
+
+$$
+p(\mathbf{v},\mathbf{l}; g) = \frac{1}{4\pi} \frac{1-g^2}{\left(1 + g^2 + 2g(\mathbf{v} \cdot \mathbf{l})\right)^{3/2}}
+$$
+
+The parameter $g$ maps directly to `scatterAnisotropy`where $g = 0$ gives isotropic scattering; $g > 0$ gives forward scattering (light continues in roughly the same direction); $g < 0$ gives backward scattering.
+
+
+## Schema
+
+- [material.KHR_materials_scatter.schema.json](schema/material.KHR_materials_scatter.schema.json)
+
+## References
+
+- [Christensen, P. and B. Burley (2015): Approximate Reflectance Profiles for Efficient Subsurface Scattering](https://graphics.pixar.com/library/ApproxBSSRDF/paper.pdf)
+- [Henyey, L. G. and J. L. Greenstein (1941): Diffuse radiation in the galaxy. Astrophysical Journal 93, 70–83](https://ui.adsabs.harvard.edu/abs/1941ApJ....93...70H/abstract)
+- [Kulla C., Conty A. (2017): Revisiting Physically Based Shading at Imageworks](https://blog.selfshadow.com/publications/s2017-shading-course/imageworks/s2017_pbs_imageworks_slides_v2.pdf)
+- [Academy Software Foundation: OpenPBR Surface Specification](https://academysoftwarefoundation.github.io/OpenPBR/)
+
+## Appendix: Full Khronos Copyright Statement
+
+Copyright 2025 The Khronos Group Inc.
+
+Some parts of this Specification are purely informative and do not define requirements
+necessary for compliance and so are outside the Scope of this Specification. These
+parts of the Specification are marked as being non-normative, or identified as
+**Implementation Notes**.
+
+Where this Specification includes normative references to external documents, only the
+specifically identified sections and functionality of those external documents are in
+Scope. Requirements defined by external documents not created by Khronos may contain
+contributions from non-members of Khronos not covered by the Khronos Intellectual
+Property Rights Policy.
+
+This specification is protected by copyright laws and contains material proprietary
+to Khronos. Except as described by these terms, it or any components
+may not be reproduced, republished, distributed, transmitted, displayed, broadcast
+or otherwise exploited in any manner without the express prior written permission
+of Khronos.
+
+This specification has been created under the Khronos Intellectual Property Rights
+Policy, which is Attachment A of the Khronos Group Membership Agreement available at
+www.khronos.org/files/member_agreement.pdf. Khronos grants a conditional
+copyright license to use and reproduce the unmodified specification for any purpose,
+without fee or royalty, EXCEPT no licenses to any patent, trademark or other
+intellectual property rights are granted under these terms. Parties desiring to
+implement the specification and make use of Khronos trademarks in relation to that
+implementation, and receive reciprocal patent license protection under the Khronos
+IP Policy must become Adopters and confirm the implementation as conformant under
+the process defined by Khronos for this specification;
+see https://www.khronos.org/adopters.
+
+Khronos makes no, and expressly disclaims any, representations or warranties,
+express or implied, regarding this specification, including, without limitation:
+merchantability, fitness for a particular purpose, non-infringement of any
+intellectual property, correctness, accuracy, completeness, timeliness, and
+reliability. Under no circumstances will Khronos, or any of its Promoters,
+Contributors or Members, or their respective partners, officers, directors,
+employees, agents or representatives be liable for any damages, whether direct,
+indirect, special or consequential damages for lost revenues, lost profits, or
+otherwise, arising from or in connection with these materials.
+
+Vulkan is a registered trademark and Khronos, OpenXR, SPIR, SPIR-V, SYCL, WebGL,
+WebCL, OpenVX, OpenVG, EGL, COLLADA, glTF, NNEF, OpenKODE, OpenKCAM, StreamInput,
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+trademarks of The Khronos Group Inc. ASTC is a trademark of ARM Holdings PLC,
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+and the OpenGL ES and OpenGL SC logos are trademarks of Silicon Graphics
+International used under license by Khronos. All other product names, trademarks,
+and/or company names are used solely for identification and belong to their
+respective owners.
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+
+
+
+
diff --git a/extensions/2.0/Khronos/KHR_materials_scatter/schema/material.KHR_materials_scatter.schema.json b/extensions/2.0/Khronos/KHR_materials_scatter/schema/material.KHR_materials_scatter.schema.json
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@@ -0,0 +1,50 @@
+{
+ "$schema": "http://json-schema.org/draft-04/schema",
+ "title": "KHR_materials_scatter glTF Material Extension",
+ "type": "object",
+ "description": "glTF extension that defines scattering properties for both thin-walled and volumetric materials.",
+ "allOf": [ { "$ref": "glTFProperty.schema.json" } ],
+ "properties": {
+ "scatterFactor": {
+ "type": "number",
+ "description": "The weight of the scattering effect. Range is [0, 1].",
+ "default": 0.0,
+ "minimum": 0.0,
+ "maximum": 1.0,
+ "gltf_detailedDescription": "Controls the overall strength of scattering. At 0, scattering is fully disabled and the material behaves as if KHR_materials_scatter were absent. At 1, the full scattering effect defined by multiscatterColorFactor and scatterAnisotropy is applied. In thin-walled mode, this lerps the transmission lobe between specular and diffuse and the transmitted color between baseColor and multiscatterColor. In volumetric mode, this scales the effective multi-scatter albedo."
+ },
+ "scatterTexture": {
+ "allOf": [ { "$ref": "textureInfo.schema.json" } ],
+ "description": "A texture that defines the per-texel scatter weight, stored in the alpha (A) channel.",
+ "gltf_detailedDescription": "A texture that defines the per-texel scatter weight, stored in the alpha (A) channel. This texture will be multiplied by the scatterFactor value. The alpha channel is used so that this texture can be shared with multiscatterColorTexture, packing the scatter weight alongside the RGB scatter color."
+ },
+ "multiscatterColorFactor": {
+ "type": "array",
+ "items": {
+ "type": "number",
+ "minimum": 0.0,
+ "maximum": 1.0
+ },
+ "description": "The multi-scatter color.",
+ "default": [ 1.0, 1.0, 1.0 ],
+ "minItems": 3,
+ "maxItems": 3,
+ "gltf_detailedDescription": "In volumetric mode (KHR_materials_volume present with thicknessFactor > 0), this is the multi-scatter albedo: the perceived color of the scattering medium after many internal bounces. In thin-walled mode, this is a multiplicative tint on the transmitted light. A value of [1, 1, 1] applies no tint."
+ },
+ "multiscatterColorTexture": {
+ "allOf": [ { "$ref": "textureInfo.schema.json" } ],
+ "description": "A texture that defines the multi-scatter color, stored in the RGB channels and encoded in sRGB.",
+ "gltf_detailedDescription": "A texture that defines the multi-scatter color, stored in the RGB channels and encoded in sRGB. This texture will be multiplied by the multiscatterColorFactor value."
+ },
+ "scatterAnisotropy": {
+ "type": "number",
+ "description": "The anisotropy of scatter events. Range is (-1, 1).",
+ "default": 0.0,
+ "exclusiveMinimum": -1.0,
+ "exclusiveMaximum": 1.0,
+ "gltf_detailedDescription": "Controls the directionality of scattered light. In volumetric mode, this is the g parameter of the Henyey-Greenstein phase function. In thin-walled mode, this controls the split of scattered energy between the two hemispheres: at +1, all light is transmitted forward (pure diffuse BTDF); at -1, all light is reflected back (pure diffuse BRDF, opaque Lambertian with multiscatterColor); at 0, energy is split equally between reflection and transmission."
+ },
+ "extensions": { },
+ "extras": { }
+ }
+}
+
+
