TerrainData.SetAlphamaps

Description

在给定贴图区域中分配所有泼溅值。

提供给该函数的数组用于确定 要替换的部分的宽度和高度。数组的第三个维度 对应于泼溅贴图纹理的数量。

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

        // For each point on the alphamap...
        for (var y = 0; y < t.terrainData.alphamapHeight; y++) {
            for (var x = 0; x < t.terrainData.alphamapWidth; x++) {
                // Get the normalized terrain coordinate that
                // corresponds to the the point.
                var normX = x * 1.0 / (t.terrainData.alphamapWidth - 1);
                var normY = y * 1.0 / (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] = frac;
                map[x, y, 1] = 1 - frac;
            }
        }

        t.terrainData.SetAlphamaps(0, 0, map);
    }