Apprenticeをダウンロード
https://www.sidefx.com/ja/products/houdini-apprentice/
18.5ヘルプ
https://www.sidefx.com/ja/docs/houdini18.5/
VEX関数
https://www.sidefx.com/ja/docs/houdini18.5/vex/functions/index.html
チュートリアル
https://www.sidefx.com/ja/tutorials/
https://www.sidefx.com/tutorials/