It is a material that only pasted the texture of the pattern of the ground to a 3D plate polygon.
Because it is a 3D material, the pattern on the ground of the Perth can be drawn easily.
The correspondence version after CLIP STUDIO PAINT1.6 has been uploaded here.
https://assets.clip-studio.com/ja-jp/detail?id=1687340
3Dの板ポリゴンに、地面の模様のテクスチャを貼り付けただけの素材です。
3D素材なので、パースのついた地面の模様が簡単に描画できます。
CLIP STUDIO PAINT1.6以降の対応版はこちらに改めてアップしました。
https://assets.clip-studio.com/ja-jp/detail?id=1687340