Reduce texture serration in shader

Questions
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1

Hello community, this is a picture of an arrow pattern, theoretically it can be any black and white pattern, I in shader by judging the value of rgba to change the original color of the pattern, and add a nice gradient color, but I do this, when the camera is viewed from a distance, the jagged feeling is serious, how do I adjust to reduce the jagged feeling
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If I comment out the code in the shader section, the native material renders very silky
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2

If you need to use alpha testing, antialias: true in the WebGLRenderer options will help, otherwise you can use the mask value as alpha and alpha blending, which will give you the best result thanks to mipmapping.

3

Thank you. I really didn’t think of it myself. It opened up new ideas for me