app/node_modules/@babylonjs/loaders/glTF/2.0/Extensions/KHR_materials_volume.js

import { PBRMaterial } from "@babylonjs/core/Materials/PBR/pbrMaterial.js";
import { GLTFLoader } from "../glTFLoader.js";
const NAME = "KHR_materials_volume";
/**
 * [Specification](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_volume/README.md)
 * @since 5.0.0
 */
// eslint-disable-next-line @typescript-eslint/naming-convention
export class KHR_materials_volume {
    /**
     * @internal
     */
    constructor(loader) {
        /**
         * The name of this extension.
         */
        this.name = NAME;
        /**
         * Defines a number that determines the order the extensions are applied.
         */
        this.order = 173;
        this._loader = loader;
        this.enabled = this._loader.isExtensionUsed(NAME);
        if (this.enabled) {
            // We need to disable instance usage because the attenuation factor depends on the node scale of each individual mesh
            this._loader._disableInstancedMesh++;
        }
    }
    /** @internal */
    dispose() {
        if (this.enabled) {
            this._loader._disableInstancedMesh--;
        }
        this._loader = null;
    }
    /**
     * @internal
     */
    loadMaterialPropertiesAsync(context, material, babylonMaterial) {
        return GLTFLoader.LoadExtensionAsync(context, material, this.name, (extensionContext, extension) => {
            const promises = new Array();
            promises.push(this._loader.loadMaterialBasePropertiesAsync(context, material, babylonMaterial));
            promises.push(this._loader.loadMaterialPropertiesAsync(context, material, babylonMaterial));
            promises.push(this._loadVolumePropertiesAsync(extensionContext, material, babylonMaterial, extension));
            return Promise.all(promises).then(() => { });
        });
    }
    _loadVolumePropertiesAsync(context, material, babylonMaterial, extension) {
        if (!(babylonMaterial instanceof PBRMaterial)) {
            throw new Error(`${context}: Material type not supported`);
        }
        // If transparency isn't enabled already, this extension shouldn't do anything.
        // i.e. it requires either the KHR_materials_transmission or KHR_materials_translucency extensions.
        if ((!babylonMaterial.subSurface.isRefractionEnabled && !babylonMaterial.subSurface.isTranslucencyEnabled) || !extension.thicknessFactor) {
            return Promise.resolve();
        }
        // IOR in this extension only affects interior.
        babylonMaterial.subSurface.volumeIndexOfRefraction = babylonMaterial.indexOfRefraction;
        const attenuationDistance = extension.attenuationDistance !== undefined ? extension.attenuationDistance : Number.MAX_VALUE;
        babylonMaterial.subSurface.tintColorAtDistance = attenuationDistance;
        if (extension.attenuationColor !== undefined && extension.attenuationColor.length == 3) {
            babylonMaterial.subSurface.tintColor.copyFromFloats(extension.attenuationColor[0], extension.attenuationColor[1], extension.attenuationColor[2]);
        }
        babylonMaterial.subSurface.minimumThickness = 0.0;
        babylonMaterial.subSurface.maximumThickness = extension.thicknessFactor;
        babylonMaterial.subSurface.useThicknessAsDepth = true;
        if (extension.thicknessTexture) {
            extension.thicknessTexture.nonColorData = true;
            return this._loader.loadTextureInfoAsync(`${context}/thicknessTexture`, extension.thicknessTexture).then((texture) => {
                babylonMaterial.subSurface.thicknessTexture = texture;
                babylonMaterial.subSurface.useGltfStyleTextures = true;
            });
        }
        else {
            return Promise.resolve();
        }
    }
}
GLTFLoader.RegisterExtension(NAME, (loader) => new KHR_materials_volume(loader));
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