Using Max’s Slate Material Editor
Opacity Maps
White = Opaque (100%) fill
Black = Transparent
Black Image with White Dots
Bump dots black & white
Bump Maps
White = depth
Black = Height
Metallic Map
Determines areas that are metal or not
White = Metals Parts
Black = Non-Metal
Rust is not considered metal. If it conducts electricity then it is
Bump Map Parameters
Creating Seamless Textures in Photoshop
Choose canvas size.
Create a document 1000x1000 pixels
Position texture where you want it to display
Rasterize layer
Then Crop your layer
Then select Filter, other offset (This will reflect image back onto itself)
Make offsets, half size of your document, then select ok
Zoom in to locate seem, this offset basically places all the edges to the center of the image
Now blend the middle cross to make this seamless
Use Spotting Healing Brush, and click on the crease to fix
Patch Tool also good option