# The Skull as a Compound Body

The skull is an interesting shape to try to compound and you can see it in all its magnificence here -

It is roughly composed of a sphere for most of it with a box around the jaw area, with a bit of work involved to position the sphere and box as best as possible. The skull is compounded to these two covering meshes.

## Compound to Empty Mesh

1. Create an empty mesh to be used as a parent for the compound body;
2. Create a range of appropriately shaped standard meshes to fit over the irregular mesh;
3. Parent the standard meshes and the irregular mesh to the empty mesh;
4. Calculate or estimate the mass for each standard mesh;
5. Create physics imposters for each standard mesh with zero mass;
6. Create a physics imposter for the empty mesh, using the NoImposter property, with the total mass of all the standard meshes.

Note Step 3 MUST come before step 4 and step 5 before step 6.

## Compound Covering Meshes to The Complex Mesh

1. Create a range of appropriately shaped standard meshes to fit over the irregular mesh;
2. Parent the standard meshes to the irregular mesh;
3. Calculate or estimate the mass for each standard mesh;
4. Create physics imposters for each standard mesh with zero mass;
5. Create a physics imposter for the irregular mesh, using the NoImposter property, with the total mass of all the standard meshes.

Note Steps 2, 4 and 5 must be in that order.

## Compound to One of the Covering Meshes

1. Create a range of appropriately shaped standard meshes to fit over the irregular mesh;
2. Choose one standard mesh and parent the other standard meshes and the irregular mesh to this mesh;
3. Calculate or estimate the mass for each standard mesh;
4. Create physics imposters for each standard mesh with the assumed mass;

Note Step 2 MUST come before step 4.