### 2.1.3. I-J-K Space

The first principal axis for each cell is relative to the direction of increasing I for that cell.

Figure 2.3: Material directions in I-J space

where,

| (2–1)

Note: When the I-J-K Space option is selected for 2D unstructured Lagrange elements, the direction of the first principal axis will coincide with the X-axis direction.

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