The other day I happened upon this old tutorial (circa XSI 3.01) from Rob Wuster about “creating an alpha channel with an extra B/W image”. Here’s a quick update to make it work with a more recent version of XSI (eg Softimage 7.5).
You need to plug the Mix 2 Colors into an image layer. To create the image layer, I added the texture by clicking Modify > Texture > Add > Image.
Using Mix 2 Colors to fake an alpha channel
This will give you the same effect shown in the tutorial:
Black-and-white image stamped on a texture
The default directory structure for new Projects is specified by a set of values in the registry.
Look under the key HKEY_LOCAL_MACHINE\SOFTWARE\Softimage\SOFTIMAGE Application\C:|Softimage|Softimage_7.5|Application|bin\Default Directory Structure.
You can add new directories by adding a new string value to the Default Directory Structure registry key.
A plug-in that updates the default directory structure was posted to the XSI Mailing list .
Also posted in the Autodesk KB.