Note about texture arrays

doc/source/smooth_terrain.md

@@ -623,7 +623,7 @@ void fragment() {
 
 Normal-mapping usually requires texture coordinates (UVs). However, smooth voxel meshes aren't trivial to UV-map at runtime. Some methods exist to generate UV-maps on completely arbitrary meshes, but they are too expensive for realtime, or inappropriate for seamless chunked terrain. So instead, we can use a form of "virtual texturing".
 
-The mesh is first subdivided into a grid of cells (we can use Transvoxel cells, which are ready to use). In each cell, we pick an axis-aligned projection working best with triangles of the cell using the average of their normals. A tile can then be generated by projecting its pixels on triangles, evaluating a normal from voxel data, and storing it in an atlas (to avoid filtering issues, we can use a TextureArray). A shader can then read the atlas using a lookup texture to find the tile. The lookup texture is a 3D texture that tells for each "cell" where is the tile in the atlas (but it can be stored as a 2D texture).
+The mesh is first subdivided into a grid of cells (we can use Transvoxel cells, which are ready to use). In each cell, we pick an axis-aligned projection working best with triangles of the cell using the average of their normals. A tile can then be generated by projecting its pixels on triangles, evaluating a normal from voxel data, and storing it in an atlas (a TextureArray could be used, but it has more limited number of layers). A shader can then read the atlas using a lookup texture to find the tile. The lookup texture is a 3D texture that tells for each "cell" where is the tile in the atlas (but it can be stored as a 2D texture).
 
 ![Image of an atlas of voxel normals](images/virtual_normalmap.webp)