import { ConstructorProps, ContextManager, Observable } from '@zcomponent/core';
import { Material } from './Material';
import { MeshChromaKeyMaterial as MeshChromaKeyMaterialInternal } from '../../internal/MeshChromaKeyMaterial';
/**
 *
 * A material for mesh chroma keying, extending the base Material class.
 * This material allows for chroma key effects, typically used in green screen techniques.
 *
 *
 * Root element: [THREE.ShaderMaterial](https://threejs.org/docs/index.html#api/en/materials/ShaderMaterial)
 * @zcomponent
 * @zgroup Materials
 * @zicon material
 * @ztag three/Material/Mesh/MeshChromaKeyMaterial
 * @zparents three/Object3D/Mesh/**
 * @zparents three/Object3D/Group/**
 * @zparents three/MaterialHost/**
 */
export declare class MeshChromaKeyMaterial extends Material {
    element: MeshChromaKeyMaterialInternal;
    /**
     * Constructs a MeshChromaKeyMaterial instance.
     *
     * @param contextManager - The context manager.
     * @param props - Initial properties for the material.
     */
    constructor(contextManager: ContextManager, props: ConstructorProps);
    private _frame;
    /**
     * Observable property for chroma key similarity.
     * Adjusts how similar the color must be to the key color to be made transparent.
     * @zprop
     * @zgroup MeshChromaKeyMaterial
     * @zgrouppriority 20
     * @ztype proportion
     * @zdefault 0.05
     */
    similarity: Observable<number, never>;
    /**
     *
     * Observable property for chroma key smoothness.
     * Determines the smoothness of the chroma key edges.
     * @zprop
     * @zgroup MeshChromaKeyMaterial
     * @zgrouppriority 20
     * @ztype proportion
     * @zdefault 0.08
     */
    smoothness: Observable<number, never>;
    /**
     *
     * Observable property for chroma key spill.
     * Controls the extent to which the key color spills onto the subject.
     * @zprop
     * @zgroup MeshChromaKeyMaterial
     * @zgrouppriority 20
     * @ztype proportion
     * @zdefault 0.2
     */
    spill: Observable<number, never>;
    /**
     * Observable property for the chroma key color.
     * Specifies the color to be keyed out.
     * @zprop
     * @zgroup MeshChromaKeyMaterial
     * @zgrouppriority 20
     * @ztype color-norm-rgb-linear
     * @zdefault [0, 1, 0]
     */
    keyColor: Observable<[number, number, number], never>;
}