/**
* Generate Two Meshes (an upper and lower) cross section from a set of intersection
* points and a plane normal. Intersection Points do not have to be in order.
*/
private static List <Triangle> CreateFrom(List <Vector3> intPoints, Vector3 planeNormal)
{
List <Triangle> tris;
if (Triangulator.MonotoneChain(intPoints, planeNormal, out tris))
{
return(tris);
}
return(null);
}
/**
* Generate Two Meshes (an upper and lower) cross section from a set of intersection
* points and a plane normal. Intersection Points do not have to be in order.
*/
private static Mesh[] CreateFrom(List <Vector3> intPoints, Vector3 planeNormal)
{
Vector3[] newVertices;
Vector2[] newUvs;
int[] newIndices;
if (Triangulator.MonotoneChain(intPoints, planeNormal, out newVertices, out newIndices, out newUvs))
{
Mesh upperCrossSection = new Mesh();
// fill the mesh structure
upperCrossSection.vertices = newVertices;
upperCrossSection.uv = newUvs;
upperCrossSection.triangles = newIndices;
// consider computing this array externally instead
upperCrossSection.RecalculateNormals();
// for the lower cross section, we need to flip the triangles so they are
// facing the right way
int indiceCount = newIndices.Length;
int[] flippedIndices = new int[indiceCount];
for (int i = 0; i < indiceCount; i += 3)
{
flippedIndices[i] = newIndices[i];
flippedIndices[i + 1] = newIndices[i + 2];
flippedIndices[i + 2] = newIndices[i + 1];
}
Mesh lowerCrossSection = new Mesh();
// fill the mesh structure
lowerCrossSection.vertices = newVertices;
lowerCrossSection.uv = newUvs;
lowerCrossSection.triangles = flippedIndices;
// consider computing this array externally instead
lowerCrossSection.RecalculateNormals();
return(new Mesh[] { upperCrossSection, lowerCrossSection });
}
return(null);
}
