The displacement texture of the pattern looks very smooth, but there are unevenness when rendered. What is the reason for this

Question: The displacement texture of the pattern looks very smooth, but there are unevenness when rendered. What is the reason for this

Answer: The main reason is that the resolution of the original displacement map is too low. The rendered effect of the displacement map depends on the resolution and detail of the original image. To improve the effect, use a higher-resolution displacement map.