If two shapes in a model overlap and are made of different materials, then the system needs to know which material should occupy that overlap region when the model is meshed.
This is accomplished through the use of Priority Numbers.
- Are assigned to EACH INDIVIDUAL SHAPE in a model.
- Range from 1 to 10.
- Are applicable ONLY when TWO OR MORE INTERSECTING SHAPES of DIFFERENT MATERIALS occur in the model.
When two shapes intersect and are different materials, the SHAPE WITH THE SMALLEST NUMBER (CLOSEST TO 1) will appear in the overlap region.
Example: A solid cylinder (core) passing through a rectangular block:
If we set the priority of the cylinder to 4 and the rectangular block to 5, then when this model is meshed, the cylinder will core a hole through the block, and the hole will be filled with the material that the cylinder is made of.
This can be seen in the following view of the mesh:
On the other hand, if we assign a priority of 6 to the cylinder and 5 to the block, then in the overlap region the block will dominate, as follows:
If we have overlapping shapes of different materials, priority numbers must be set correctly to produce the correct results.