56 lines
2.0 KiB
C#
56 lines
2.0 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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public class GerstnerWave : MonoBehaviour
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{
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public float waveLength = 0.1f;
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public float amplitude = 0.1f;
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public float speed = 1f;
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public Vector2 direction = new Vector2(1.0f, 0.0f);
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void Update()
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{
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Mesh mesh = GetComponent<MeshFilter>().mesh;
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Vector3[] vertices = mesh.vertices;
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Vector3[] normals = mesh.normals;
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float waveNumber = 2.0f * Mathf.PI / waveLength;
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float phaseConstant = speed * waveNumber;
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for (int i = 0; i < vertices.Length; i++)
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{
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Vector3 vertex = vertices[i];
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float dotProduct = Vector2.Dot(new Vector2(vertex.x, vertex.z), direction);
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float wavePhase = waveNumber * dotProduct + phaseConstant * Time.time;
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vertex.y = amplitude * Mathf.Sin(wavePhase);
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vertices[i] = vertex;
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// Calculate the normal at the vertex
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float cosPhase = Mathf.Cos(wavePhase);
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float dx = -waveNumber * amplitude * direction.x * cosPhase;
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float dz = -waveNumber * amplitude * direction.y * cosPhase;
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normals[i] = new Vector3(dx, 1.0f, dz).normalized;
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}
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mesh.vertices = vertices;
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mesh.normals = normals;
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}
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public Vector3 GetWaveNormal(Vector3 position)
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{
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float waveNumber = 2.0f * Mathf.PI / waveLength;
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float phaseConstant = speed * waveNumber;
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float dotProduct = Vector2.Dot(new Vector2(position.x + transform.position.x, position.z + transform.position.z), direction);
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float wavePhase = waveNumber * dotProduct + phaseConstant * Time.time;
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float cosPhase = Mathf.Cos(wavePhase);
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// We differentiate the wave function to get the slope at the current point
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float dx = -waveNumber * amplitude * direction.x * cosPhase;
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float dz = -waveNumber * amplitude * direction.y * cosPhase;
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Vector3 normal = new Vector3(dx, 1.0f, dz).normalized;
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return normal;
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}
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} |