This is weird. Why do these two have different shading, despite having very similar geometry? I thought the problem was the shading mode (one is smooth, one is flat), but when I enable shading smooth on the left shape, its shading remains unchanged. So, what's the problem?

Left shape topology Right shape topology

Here's my Blend File.

  • $\begingroup$ could you please share your file? blend-exchange.giantcowfilms.com $\endgroup$ – moonboots Aug 5 '19 at 9:59
  • $\begingroup$ @moonboots: Hi, I've updated with the blend file. Sometimes I can produce the left shape, sometimes I can't. I dont get why. $\endgroup$ – Đặng Hải Phụng Aug 5 '19 at 10:10
  • $\begingroup$ could you please use another download platform, this one doesn't seem to work... $\endgroup$ – moonboots Aug 5 '19 at 10:19
  • $\begingroup$ Hi, I've re-updated the link. Sorry for the inconvenience and thank you for your patience. $\endgroup$ – Đặng Hải Phụng Aug 5 '19 at 10:25

One of your object is auto-smoothed, the other is not. You have smoothed both your objects in the Tools panel > Tools > Edit > Shading > Smooth. Blender can't smooth a very angular and low-poly mesh without apparent artefacts. With Auto Smooth it will only smooth below the chosen angle and therefore you will avoid these kind of artefacts for the superior values.

enter image description here

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  • $\begingroup$ Omg. Thank a ton for this, moonboots. It causes me a lot of frustration, becasue sometimes I can produce the same result as the left but have no idea why. $\endgroup$ – Đặng Hải Phụng Aug 5 '19 at 10:43

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