FILL FACES

 
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Clicking the "Fill_Faces" button will break down the N_Gon shape into quads and triangles.

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Increase the "Face Subdivide " slider to 1. This will subdivide the new inside edges once.
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Increase the slider for more subdivisions.
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In some cases "Even Spacing " option will yield better results.
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Optionally, you can also reduce the "Simplification" for a higher resolution mesh.

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