How to set a clip a texture?

Unity Engine
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1

If i want to set a part of a texture be displayed, such as a sector of a rotundity，how ?

2

I’m not sure what a sector of rotundity is, but you can display a small part of a texture quite easily. In the material, set the tiling to a value below 1 (eg, if the area is half the size of the full texture, set the tiling values to 0.5) and then use the offset to shift to the right part of the texture.