private void CreateTriangle(Intersector inter, int i, Vector3 objVert1, Vector3 objVert2, Vector3 objVert3,
bool isFirstLower, bool isSecondLower, bool isThirdLower)
{
if (isFirstLower && !isSecondLower && !isThirdLower)
{
inter.CreateTriangleOnePointOnLeft(objVert1, objVert2, objVert3, i, 0, 1, 2);
}
else if (isSecondLower && !isFirstLower && !isThirdLower)
{
inter.CreateTriangleOnePointOnLeft(objVert2, objVert1, objVert3, i, 1, 0, 2);
}
else if (isThirdLower && !isFirstLower && !isSecondLower)
{
inter.CreateTriangleOnePointOnLeft(objVert3, objVert1, objVert2, i, 2, 0, 1);
}
else if (isFirstLower && isSecondLower && !isThirdLower)
{
inter.CreateTrianglesTwoPointsOnLeft(objVert1, objVert2, objVert3, i, 0, 1, 2);
}
else if (!isFirstLower && isSecondLower && isThirdLower)
{
inter.CreateTrianglesTwoPointsOnLeft(objVert2, objVert3, objVert1, i, 1, 2, 0);
}
else if (isFirstLower && !isSecondLower && isThirdLower)
{
inter.CreateTrianglesTwoPointsOnLeft(objVert1, objVert3, objVert2, i, 0, 2, 1);
}
}
private void Slice(Vector3 slicerNormal, Vector3 slicerPoint, bool shouldDisplayLowerSide,
bool shouldDisplayUpperSide, out Intersector interLow, out Intersector interUp)
{
var srcVerts = _mesh.vertices;
var srcEbo = _mesh.triangles;
var lowerEbo = new List <int>();
var upperEbo = new List <int>();
interLow = new Intersector(slicerPoint, slicerNormal, _srcObject, _mesh, lowerEbo);
interUp = new Intersector(slicerPoint, slicerNormal, _srcObject, _mesh, upperEbo);
int len = _mesh.triangles.Length;
for (var i = 0; i < len; i += 3)
{
var objVert1 = _srcObject.transform.TransformPoint(srcVerts[srcEbo[i]]);
var objVert2 = _srcObject.transform.TransformPoint(srcVerts[srcEbo[i + 1]]);
var objVert3 = _srcObject.transform.TransformPoint(srcVerts[srcEbo[i + 2]]);
var isFirstLower = IsPointLower(objVert1, slicerPoint, slicerNormal);
var isSecondLower = IsPointLower(objVert2, slicerPoint, slicerNormal);
var isThirdLower = IsPointLower(objVert3, slicerPoint, slicerNormal);
if (isFirstLower && isSecondLower && isThirdLower)
{
if (shouldDisplayLowerSide)
{
lowerEbo.Add(srcEbo[i]);
lowerEbo.Add(srcEbo[i + 1]);
lowerEbo.Add(srcEbo[i + 2]);
}
}
else if (!isFirstLower && !isSecondLower && !isThirdLower)
{
if (shouldDisplayUpperSide)
{
upperEbo.Add(srcEbo[i]);
upperEbo.Add(srcEbo[i + 1]);
upperEbo.Add(srcEbo[i + 2]);
}
}
else
{
if (shouldDisplayLowerSide)
{
CreateTriangle(interLow, i, objVert1, objVert2, objVert3, isFirstLower, isSecondLower,
isThirdLower);
}
if (shouldDisplayUpperSide)
{
CreateTriangle(interUp, i, objVert1, objVert2, objVert3, !isFirstLower, !isSecondLower,
!isThirdLower);
}
}
}
}
private void UpdateMesh(ref GameObject borderObj, Intersector intersector)
{
borderObj = Object.Instantiate(_srcObject, _srcObject.transform.parent);
foreach (Transform child in borderObj.transform)
{
MonoBehaviour.Destroy(child.gameObject);
}
borderObj.GetComponent <MeshFilter>().sharedMesh = intersector.CreateMesh();
borderObj.GetComponent <Renderer>().enabled = true;
borderObj.transform.position = _srcObject.transform.position;
borderObj.transform.rotation = _srcObject.transform.rotation;
borderObj.transform.localScale = _srcObject.transform.localScale;
_srcObject.GetComponent <Renderer>().enabled = false;
}