The Space Filling design spreads design points fairly uniformly throughout the design region. It accommodates linear constraints. The design is generated in a fashion similar to the Fast Flexible Filling design method found under DOE > Space Filling Design (Fast Flexible Filling Designs).
Note: Depending on the number of factors and the specified value for Runs, you may want to increase the average number of initial points per design point by selecting Advanced Options > Set Average Cluster Size.
The design region can be defined by selecting the Linear Constraint option in the Linear Constraints panel.
When linear constraints are specified using the Add linear constraints option, the random points that form the basis for the clustering algorithm are uniformlydistributed within the constrained design region. The clustering algorithm uses these points.
1.

Select DOE > Mixture Design.

2.

3.

Click Continue.

4.

Add Linear Constraints, if you have any.

5.

Specify the number of runs you want in the Runs box to the right of the Space Filling button in the Mixture Design Type dialog (Mixture Design Selection Dialog).

6.

Click Space Filling.

Consider a threefactor mixture design with the single linear constraint: . Space Filling Design with One Linear Constraint shows a ternary plot for a 30run Space Filling design that satisfies this constraint. (For a discussion of ternary plots, see Creating Ternary Plots.) Note that the points fall in the constrained design region and are fairly well spread throughout this region.