/// <summary>
/// Assign a randomly chosen Wall and Roof <see cref="Material"/> to a given building.
/// </summary>
/// <param name="building">Building to assign <see cref="Material"/>s to.</param>
/// <param name="index">
/// Optional index of Wall and Roof <see cref="Material"/> pair to apply. If this value is not
/// set a random <see cref="Material"/> pair will be used.
/// </param>
internal void AssignNineSlicedMaterials(GameObject building, int?index = null)
{
// If a specific Material index was given, verify it is a valid index for a Wall and Roof
// Material pair.
if (index.HasValue)
{
if (index.Value < 0 || index.Value >= WallMaterials.Length)
{
Debug.LogError(ExampleErrors.InvalidArrayIndex(this, WallMaterials, "Wall Materials",
index.Value));
return;
}
}
else
{
// Pick a random Material index to use for both Wall and Roof Materials. Not that the same
// index will work for both arrays of Materials, as we have already verified that the Wall and
// Roof Material arrays are the same length.
index = Random.Range(0, WallMaterials.Length);
}
// Replace building MeshRenderer's sharedMaterials array with chosen Materials. Note that this
// must be done by creating a new array of Materials, rather than altering the entries of this
// MeshRenderer's sharedMaterials array, as altering the existing array will not actually
// change the MeshRenderer's Materials.
MeshRenderer buildingMeshRenderer = building.GetComponent <MeshRenderer>();
buildingMeshRenderer.sharedMaterials = new Material[] {
WallMaterials[index.Value], RoofMaterials[index.Value]
};
}
