Version: 2022.3
LanguageEnglish
  • C#

TerrainData.SetAlphamaps

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

Declaration

public void SetAlphamaps(int x, int y, float[,,] map);

Description

Assign all splat values in the given map area.

The array supplied to this function determines the width and height of the portion to be replaced. The third dimension of the array corresponds to the number of splatmap textures.

using UnityEngine;

public class Example : MonoBehaviour { public Terrain t; // Blend the two terrain textures according to the steepness of // the slope at each point. void Start() { float[,,] map = new float[t.terrainData.alphamapWidth, t.terrainData.alphamapHeight, 2];

// For each point on the alphamap... for (int y = 0; y < t.terrainData.alphamapHeight; y++) { for (int x = 0; x < t.terrainData.alphamapWidth; x++) { // Get the normalized terrain coordinate that // corresponds to the point. float normX = x * 1.0f / (t.terrainData.alphamapWidth - 1); float normY = y * 1.0f / (t.terrainData.alphamapHeight - 1);

// Get the steepness value at the normalized coordinate. var angle = t.terrainData.GetSteepness(normX, normY);

// Steepness is given as an angle, 0..90 degrees. Divide // by 90 to get an alpha blending value in the range 0..1. var frac = angle / 90.0; map[x, y, 0] = (float)frac; map[x, y, 1] = (float)(1 - frac); } } t.terrainData.SetAlphamaps(0, 0, map); } }
Copyright © 2023 Unity Technologies
优美缔软件(上海)有限公司 版权所有
"Unity"、Unity 徽标及其他 Unity 商标是 Unity Technologies 或其附属机构在美国及其他地区的商标或注册商标。其他名称或品牌是其各自所有者的商标。
公安部备案号:
31010902002961