There are 2 ways to access texture tools in Octane:
From Material Editor
You can use the classic material editor. If you go to the texture section of any material channel and press the mini icon next to it, the texture menu will appear. This menu is the classic Cinema 4D texture menu. A little further below there is "C4doctane" menu. When you select this, a new sub menu will be opened. Here are the texture tool varieties of Octane in this menu. You can select and use any texture tool you want.
From node Editor
You can also access the Texture Tool from the node editor. Open the Node editor from the LV (see the relevant section for the Node editor). On the left side of the editor window you will all the texture types that Octane uses.
whIch method you use ?
The answer to this question, of course, emerges as you use it. Dealing with textures is quite enjoyable, but since it is a laborious process, you can use it if you feel more comfortable with these 2 options. Comfort, speed and efficiency are key words in texture creation. That's why we will use the "Node Editor" in all our texture explanations.
Quote from "Node Editor vs. Material Editor"
"Creating material is a serious and difficult task and it is important to work effectively in this process. The Octane material editor is working on Cinema 4D's own editor. At first, it can offer both the ease of not being strangers and the ease of working in a familiar interface. But this comfort is temporary. After a while you can find yourself swung around there among the options of the material editor. It can turn into torture in the material editor after a while, clicking on something constantly, going back and forth between previous and next options, revising some values many times. That's where Octane's Node Editor saves lives. In this editor everything is in front of you and under your hand, you will not be thrown from here to there, you will not lose your way between the windows. Once you have used it a little longer, it is very difficult to go back to the old material window. Yes, like every Node editor, it can take a while to get used to it, but this is about you. Otherwise, the convenience of the Node Editor and the bulk of the material editor can not be compared"