<!-- NEW5 — TEST 5 · THE BEND AT THE HEART · part 212 -->
refractionRatio = 0.98;

		/**
		 * Renders the geometry as a wireframe.
		 *
		 * @type {boolean}
		 * @default false
		 */
		this.wireframe = false;

		/**
		 * Controls the thickness of the wireframe.
		 *
		 * Can only be used with {@link SVGRenderer}.
		 *
		 * @type {number}
		 * @default 1
		 */
		this.wireframeLinewidth = 1;

		/**
		 * Defines appearance of wireframe ends.
		 *
		 * Can only be used with {@link SVGRenderer}.
		 *
		 * @type {('round'|'bevel'|'miter')}
		 * @default 'round'
		 */
		this.wireframeLinecap = 'round';

		/**
		 * Defines appearance of wireframe joints.
		 *
		 * Can only be used with {@link SVGRenderer}.
		 *
		 * @type {('round'|'bevel'|'miter')}
		 * @default 'round'
		 */
		this.wireframeLinejoin = 'round';

		/**
		 * Whether the material is rendered with flat shading or not.
		 *
		 * @type {boolean}
		 * @default false
		 */
		this.flatShading = false;

		/**
		 * Whether the material is affected by fog or not.
		 *
		 * @type {boolean}
		 * @default true
		 */
		this.fog = true;

		this.setValues( parameters );

	}

	copy( source ) {

		super.copy( source );

		this.color.copy( source.color );

		this.map = source.map;

		this.lightMap = source.lightMap;
		this.lightMapIntensity = source.lightMapIntensity;

		this.aoMap = source.aoMap;
		this.aoMapIntensity = source.aoMapIntensity;

		this.emissive.copy( source.emissive );
		this.emissiveMap = source.emissiveMap;
		this.emissiveIntensity = source.emissiveIntensity;

		this.bumpMap = source.bumpMap;
		this.bumpScale = source.bumpScale;

		this.normalMap = source.normalMap;
		this.normalMapType = source.normalMapType;
		this.normalScale.copy( source.normalScale );

		this.displacementMap = source.displacementMap;
		this.displacementScale = source.displacementScale;
		this.displacementBias = source.displacementBias;

		this.specularMap = source.specularMap;

		this.alphaMap = source.alphaMap;

		this.envMap = source.envMap;
		this.envMapRotation.copy( source.envMapRotation );
		this.combine = source.combine;
		this.reflectivity = source.reflectivity;
		this.envMapIntensity = source.envMapIntensity;
		this.refractionRatio = source.refractionRatio;

		this.wireframe = source.wireframe;
		this.wireframeLinewidth = source.wireframeLinewidth;
		this.wireframeLinecap = source.wireframeLinecap;
		this.wireframeLinejoin = source.wireframeLinejoin;

		this.flatShading = source.flatShading;

		this.fog = source.fog;

		return this;

	}

}

/**
 * A material for drawing geometry by depth. Depth is based off of the camera
 * near and far plane. White is nearest, black is farthest.
 *
 * @augments Material
 * @demo scenes/material-browser.html#MeshDepthMaterial
 */
class MeshDepthMaterial extends Material {

	/**
	 * Constructs a new mesh depth material.
	 *
	 * @param {Object} [parameters] - An object with one or more properties
	 * defining the material's appearance. Any property of the material
	 * (including any property from inherited materials) can be passed
	 * in here. Color values can be passed any type of value accepted
	 * by {@link Color#set}.
	 */
	constructor( parameters ) {

		super();

		/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isMeshDepthMaterial = true;

		this.type = 'MeshDepthMaterial';

		/**
		 * Type for depth packing.
		 *
		 * @type {(BasicDepthPacking|RGBADepthPacking|RGBDepthPacking|RGDepthPacking)}
		 * @default BasicDepthPacking
		 */
		this.depthPacking = BasicDepthPacking;

		/**
		 * The color map. May optionally include an alpha channel, typically combined
		 * with {@link Material#transparent} or {@link Material#alphaTest}.
		 *
		 * `map` represents color data, and the texture must be assigned a
		 * {@link Texture#colorSpace}. Most `map` textures set
		 * `texture.colorSpace = SRGBColorSpace`.
		 *
		 * @type {?Texture}
		 * @default null
		 */
		this.map = null;

		/**
		 * The alpha map is a grayscale texture that controls the opacity across the
		 * surface (black: fully transparent; white: fully opaque).
		 *
		 * Only the color of the texture is used, ignoring the alpha channel if one
		 * exists. For RGB and RGBA textures, the renderer will use the green channel
		 * when sampling this texture due to the extra bit of precision provided for
		 * green in DXT-compressed and uncompressed RGB 565 formats. Luminance-only and
		 * luminance/alpha textures will also still work as expected.
		 *
		 * `alphaMap` represents non-color data. Any texture assigned must have
		 * `texture.colorSpace = NoColorSpace` (default).
		 *
		 * @type {?Texture}
		 * @default null
		 */
		this.alphaMap = null;

		/**
		 * The displacement map affects the position of the mesh's vertices. Unlike
		 * other maps which only affect the light and shade of the material the
		 * displaced vertices can cast shadows, block other objects, and otherwise
		 * act as real geometry. The d