import type { TSLMat3Node } from '../../types/tsl.cjs';
import type { MPMFluidUniforms, MPMMaterialModel, MPMMaterialParticleContext, MPMMaterialStressContext, MPMMaterialUpdateContext, MPMParticleFieldMap } from './MPMFluidModel.cjs';
export declare const MPM_R185_STIFFNESS = 50;
export declare const MPM_R185_REST_DENSITY = 1.5;
export declare const MPM_R185_VISCOSITY = 0.1;
/**
 * Measurement-only material contract matching the Three.js r185 fluid example.
 * Production water continues to use `MPMFluidModel`; this model deliberately
 * preserves the official gamma-five pressure equation without production clamps.
 */
export declare class MPMR185FluidModel implements MPMMaterialModel<MPMFluidUniforms> {
    name: 'fluid-r185-parity';
    particleFields: MPMParticleFieldMap;
    uniforms: MPMFluidUniforms;
    constructor();
    initParticle({ particle }: MPMMaterialParticleContext): void;
    stress({ C, density }: MPMMaterialStressContext): TSLMat3Node;
    updateDeformation(): void;
    updateDeformation(context: MPMMaterialUpdateContext): void;
}