Let’s say you have some elements where the material rotation needs to be modified. Depending on the number of objects I have included some approaches below. You can selectively rotate a material with a model surface pattern or you can create a new material and assign it to objects.
If the material has a surface pattern, of Pattern Type > Model, you can TAB select over the pattern until selected. You can then initiate the rotate tool to modify the pattern orientation and corresponding material rotation for that instance only:
Another approach is to create a second material with a varying rotation angle. You can achieve this through the material render appearance.
Materials > Render Appearance > Image > Edit Image > Transforms > Position > Rotation:
Keep in mind if you rotate the material image in this manner the model pattern will not rotate with it. You would need to create a second model pattern type with a matching rotation or simply rotate the model pattern as described above [which will also rotate the material appearance].
You can also apply the material using the Modify > Paint tool to any object face once you have a second material:
Related to this, if your material with a surface model pattern is inside an in-place component, ensure to edit the component prior to attempting to rotate or move the pattern. Otherwise you will simply move the entire component versus the pattern:
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