Currently three wants to achieve the effect shown in the image, a model two colors; And another color gradually covers another color with the Y-axis;hope you can help, thank you
As long as you want the division between colors to be a flat plane, you can use clipping planes to achieve this.
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All the same, but one mesh
Clipping won’t work anymore though 
, as its chunk is removed from fragment shader.
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@prisoner849 nice! 
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Thank you very much for your answer and the question has been resolved