一个立方体贴图一组六个正方形纹理,可以表示环境中的反射或几何体后面绘制的天空盒。这六个正方形形成了一个包围对象的虚拟立方体的面;每个面表示沿世界轴方向(上、下、左、右、前和后)的视图。 更多信息
参见 术语表数组是由相同大小和格式的立方体贴图组成的数组,GPU 可以将其作为单个纹理资源访问。立方体贴图数组通常用于实现高效的反射探针一种渲染组件,它以所有方向捕获其周围环境的球形视图,有点像相机。然后将捕获的图像存储为立方体贴图,可供具有反射材质的对象使用。 更多信息
参见 术语表、照明和阴影系统。
要在项目中创建立方体贴图数组,必须使用脚本。
以下示例是一个编辑器脚本,它创建 CubemapArray
类的实例,用颜色数据填充它,然后将其保存到项目中作为纹理资源。
using UnityEngine;
using UnityEditor;
public class CreateCubeArrayTexture : MonoBehaviour
{
[UnityEditor.MenuItem("CreateExamples/CubemapArray")]
static void CreateCubemapArray()
{
// Configure the cubemap array and color data
int faceSize = 16;
int arraySize = 4;
int[] kCubeXRemap = new int[] { 2, 2, 0, 0, 0, 0 };
int[] kCubeYRemap = new int[] { 1, 1, 2, 2, 1, 1 };
int[] kCubeZRemap = new int[] { 0, 0, 1, 1, 2, 2 };
float[] kCubeXSign = new float[] { -1.0F, 1.0F, 1.0F, 1.0F, 1.0F, -1.0F };
float[] kCubeYSign = new float[] { -1.0F, -1.0F, 1.0F, -1.0F, -1.0F, -1.0F };
float[] kCubeZSign = new float[] { 1.0F, -1.0F, 1.0F, -1.0F, 1.0F, -1.0F };
var baseCols = new Color[] { Color.white, new Color(1, .5f, .5f, 1), new Color(.5f, 1, .5f, 1), new Color(.5f, .5f, 1, 1), Color.gray };
// Create an instance of CubemapArray
var tex = new CubemapArray(faceSize, arraySize, TextureFormat.ARGB32, true);
tex.filterMode = FilterMode.Trilinear;
// Iterate over each cubemap
var col = new Color[tex.width * tex.width];
float invSize = 1.0f / tex.width;
for (var i = 0; i < tex.cubemapCount; ++i)
{
var baseCol = baseCols[i % baseCols.Length];
// Iterate over each face of the current cubemap
for (var face = 0; face < 6; ++face)
{
var idx = 0;
Vector3 signScale = new Vector3(kCubeXSign[face], kCubeYSign[face], kCubeZSign[face]);
// Iterate over each pixel of the current face
for (int y = 0; y < tex.width; ++y)
{
for (int x = 0; x < tex.width; ++x)
{
// Calculate a "normal direction" color for the current pixel
Vector3 uvDir = new Vector3(x * invSize * 2.0f - 1.0f, y * invSize * 2.0f - 1.0f, 1.0f);
uvDir = uvDir.normalized;
uvDir.Scale(signScale);
Vector3 dir = Vector3.zero;
dir[kCubeXRemap[face]] = uvDir[0];
dir[kCubeYRemap[face]] = uvDir[1];
dir[kCubeZRemap[face]] = uvDir[2];
// Shift the color into the 0.4..1.0 range
Color c = new Color(dir.x * 0.3f + 0.7f, dir.y * 0.3f + 0.7f, dir.z * 0.3f + 0.7f, 1.0f);
// Add a pattern to some pixels, so that mipmaps are more clearly visible
if (((x ^ y) & 3) == 1)
c *= 0.5f;
// Tint the color with the baseCol tint
col[idx] = baseCol * c;
++idx;
}
}
// Copy the color values for this face to the texture
tex.SetPixels(col, (CubemapFace)face, i);
}
}
// Apply the changes to the texture and upload the updated texture to the GPU
tex.Apply();
// Save the texture to your Unity Project
AssetDatabase.CreateAsset(tex, "Assets/ExampleCubemapArray.asset");
UnityEditor.AssetDatabase.SaveAssets();
}
}
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