As per Josh 100 % correct, but it will slow your computer speed by increasing HLR/HLV, I would suggest keep it in the middle the image could be fine.
It looks like you are just referring to the graphical representation of the surface. This surface should follow your equation but you may have to increase your image quality to see this.
Hi, thank you for your reply, much appreciated. For your information, I have increased the image quality to the highest. However, it still result the same. Is there another way to solve it?
Thank you very much!
Josh thank you for in detailed picture.
Okay understood, thank you very much!
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