The simplex lattice design is a space filling design that creates a triangular grid of runs. The design is the set of all combinations where the factors’ values are i / m, where i is an integer from 0 to m such that the sum of the factors is 1.
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Select DOE > Mixture Design.

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Click Continue.

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Specify the number of levels you want in the Mixture Design Type dialog (Mixture Design Selection Dialog) and click Simplex Lattice.

ThreeFactor Simplex Lattice Designs for Factor Levels 3, 4, and 5 shows the runs for threefactor simplex lattice designs of degrees 3, 4, and 5, with their corresponding geometric representations. In contrast to the simplex centroid design, the simplex lattice design does not necessarily include the centroid.
JMP Design Table for Simplex Lattice with Five Variables, Order (Degree) 3 lists the runs for a simplex lattice of degree 3 for five effects. In the fivelevel example, the runs creep across the hypertriangular region and fill the space in a gridlike manner.