Early draft for Substance Painter documentation

website/docs/artist_hosts_substancepainter.md

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+---
+id: artist_hosts_substancepainter
+title: Substance Painter
+sidebar_label: Substance Painter
+---
+
+## OpenPype global tools
+
+-   [Work Files](artist_tools.md#workfiles)
+-   [Load](artist_tools.md#loader)
+-   [Manage (Inventory)](artist_tools.md#inventory)
+-   [Publish](artist_tools.md#publisher)
+-   [Library Loader](artist_tools.md#library-loader)
+
+## Working with OpenPype in Substance Painter
+
+The Substance Painter OpenPype integration allows you to:
+
+- Set the project mesh and easily keep it in sync with updates of the model
+- Easily export your textures as versioned publishes for others to load and update.
+
+## Setting the project mesh
+
+Substance Painter requires a project file to have a mesh path configured.
+As such, you can't start a workfile without choosing a mesh path.
+
+To start a new project using a published model you can _without an open project_
+use OpenPype > Load.. > Load Mesh on a supported publish. This will prompt you
+with a New Project prompt preset to that particular mesh file.
+
+If you already have a project open, you can also replace (reload) your mesh 
+using the same Load Mesh functionality. 
+
+After having the project mesh loaded or reloaded through the loader
+tool the mesh will be _managed_ by OpenPype. For example, you'll be notified 
+on workfile open whether the mesh in your workfile is outdated. You can also
+set it to specific version using OpenPype > Manage.. where you can right click 
+on the project mesh to perform _Set Version_
+
+:::info
+A Substance Painter project will always have only one mesh set. Whenever you 
+trigger _Load Mesh_ from the loader this will **replace** your currently loaded 
+mesh for your open project.
+:::
+
+## Publishing textures
+
+To publish your textures we must first create a `textureSet` 
+publish instance. 
+
+To create a **TextureSet instance** we will use OpenPype's publisher tool. Go 
+to **OpenPype → Publish... → TextureSet**
+
+The texture set instance will define what Substance Painter export template `.spexp` to
+use and thus defines what texture maps will be exported from your workfile.
+
+:::info
+The TextureSet instance gets saved with your Substance Painter project. As such, 
+you will only need to configure this once for your workfile. Next time you can
+just click **OpenPype → Publish...** and start publishing directly with the
+same settings.
+:::
+
+
+### Known issues
+
+#### Can't see the OpenPype menu?
+
+If you're unable to see the OpenPype top level menu in Substance Painter make
+sure you have launched Substance Painter through OpenPype and that the OpenPype
+Integration plug-in is loaded inside Substance Painter: **Python > openpype_plugin**
+
+#### Substance Painter + Steam
+
+Running the steam version of Substance Painter within OpenPype will require you 
+to close the Steam executable before launching Substance Painter through OpenPype. 
+Otherwise the Substance Painter process is launched using Steam's existing 
+environment and thus will not be able to pick up the pipeline integration.
+
+This appears to be a limitation of how Steam works.