Hi Eric, there isn't really any predefined limit.
A practical limit would have to do a lot with the shape and complexity of your curves, if you have complex wiggly curves with lots of intersections between the 2 directions of the grid, that will tend to produce a more dense surface and if you get a surface with a very large number of control points in it, that can slow things down and take up a lot of memory.
But I doubt that you will be anywhere near that point with 15 curves like you are describing...
- Michael
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