import type { ComputeNode } from 'three/webgpu';
import type { TSLFloatNode, TSLStorageNode } from '../../../types/tsl.cjs';
/**
 * Naive O(N²) viscosity force computation pass.
 * Computes viscosity forces using viscosity kernel.
 *
 * @param {*} positionsBuffer Particle positions buffer.
 * @param {*} velocitiesBuffer Particle velocities buffer.
 * @param {*} densitiesBuffer Particle densities buffer.
 * @param {*} viscosityForcesBuffer Viscosity forces buffer.
 * @param {number} particleCount Number of particles.
 * @param {*} viscosity Viscosity kernel coefficient uniform.
 * @param {*} viscosityMu Viscosity coefficient uniform.
 * @param {*} h Smoothing radius uniform.
 * @param {*} mass Particle mass uniform.
 * @returns {*} Compute node.
 */
export declare function computeViscosityPass(positionsBuffer: TSLStorageNode<'vec3'>, velocitiesBuffer: TSLStorageNode<'vec3'>, densitiesBuffer: TSLStorageNode<'float'>, viscosityForcesBuffer: TSLStorageNode<'vec3'>, particleCount: number, viscosity: TSLFloatNode, viscosityMu: TSLFloatNode, h: TSLFloatNode, mass: TSLFloatNode): ComputeNode;