private static void NormalCheck(ref Mesh_Maker.Triangle triangle)
{
Vector3 crossProduct = Vector3.Cross(triangle.vertices[1] - triangle.vertices[0], triangle.vertices[2] - triangle.vertices[0]);
Vector3 averageNormal = (triangle.normals[0] + triangle.normals[1] + triangle.normals[2]) / 3.0f;
float dotProduct = Vector3.Dot(averageNormal, crossProduct);
if (dotProduct < 0)
{
Vector3 temp = triangle.vertices[2];
triangle.vertices[2] = triangle.vertices[0];
triangle.vertices[0] = temp;
temp = triangle.normals[2];
triangle.normals[2] = triangle.normals[0];
triangle.normals[0] = temp;
Vector2 temp2 = triangle.uvs[2];
triangle.uvs[2] = triangle.uvs[0];
triangle.uvs[0] = temp2;
Vector4 temp3 = triangle.tangents[2];
triangle.tangents[2] = triangle.tangents[0];
triangle.tangents[0] = temp3;
}
}
// Functions
private static void Cut_this_Face(ref Mesh_Maker.Triangle triangle, int submesh)
{
_isLeftSideCache[0] = _blade.GetSide(triangle.vertices[0]); // true = left
_isLeftSideCache[1] = _blade.GetSide(triangle.vertices[1]);
_isLeftSideCache[2] = _blade.GetSide(triangle.vertices[2]);
int leftCount = 0;
int rightCount = 0;
for (int i = 0; i < 3; i++)
{
if (_isLeftSideCache[i])
{ // left
_leftTriangleCache.vertices[leftCount] = triangle.vertices[i];
_leftTriangleCache.uvs[leftCount] = triangle.uvs[i];
_leftTriangleCache.normals[leftCount] = triangle.normals[i];
_leftTriangleCache.tangents[leftCount] = triangle.tangents[i];
leftCount++;
}
else
{ // right
_rightTriangleCache.vertices[rightCount] = triangle.vertices[i];
_rightTriangleCache.uvs[rightCount] = triangle.uvs[i];
_rightTriangleCache.normals[rightCount] = triangle.normals[i];
_rightTriangleCache.tangents[rightCount] = triangle.tangents[i];
rightCount++;
}
}
// find the new triangles X 3
// first the new vertices
// this will give me a triangle with the solo point as first
if (leftCount == 1)
{
_triangleCache.vertices[0] = _leftTriangleCache.vertices[0];
_triangleCache.uvs[0] = _leftTriangleCache.uvs[0];
_triangleCache.normals[0] = _leftTriangleCache.normals[0];
_triangleCache.tangents[0] = _leftTriangleCache.tangents[0];
_triangleCache.vertices[1] = _rightTriangleCache.vertices[0];
_triangleCache.uvs[1] = _rightTriangleCache.uvs[0];
_triangleCache.normals[1] = _rightTriangleCache.normals[0];
_triangleCache.tangents[1] = _rightTriangleCache.tangents[0];
_triangleCache.vertices[2] = _rightTriangleCache.vertices[1];
_triangleCache.uvs[2] = _rightTriangleCache.uvs[1];
_triangleCache.normals[2] = _rightTriangleCache.normals[1];
_triangleCache.tangents[2] = _rightTriangleCache.tangents[1];
}
else // rightCount == 1
{
_triangleCache.vertices[0] = _rightTriangleCache.vertices[0];
_triangleCache.uvs[0] = _rightTriangleCache.uvs[0];
_triangleCache.normals[0] = _rightTriangleCache.normals[0];
_triangleCache.tangents[0] = _rightTriangleCache.tangents[0];
_triangleCache.vertices[1] = _leftTriangleCache.vertices[0];
_triangleCache.uvs[1] = _leftTriangleCache.uvs[0];
_triangleCache.normals[1] = _leftTriangleCache.normals[0];
_triangleCache.tangents[1] = _leftTriangleCache.tangents[0];
_triangleCache.vertices[2] = _leftTriangleCache.vertices[1];
_triangleCache.uvs[2] = _leftTriangleCache.uvs[1];
_triangleCache.normals[2] = _leftTriangleCache.normals[1];
_triangleCache.tangents[2] = _leftTriangleCache.tangents[1];
}
// now to find the intersection points between the solo point and the others
float distance = 0;
float normalizedDistance = 0.0f;
Vector3 edgeVector = Vector3.zero; // contains edge length and direction
edgeVector = _triangleCache.vertices[1] - _triangleCache.vertices[0];
_blade.Raycast(new Ray(_triangleCache.vertices[0], edgeVector.normalized), out distance);
normalizedDistance = distance / edgeVector.magnitude;
_newTriangleCache.vertices[0] = Vector3.Lerp(_triangleCache.vertices[0], _triangleCache.vertices[1], normalizedDistance);
_newTriangleCache.uvs[0] = Vector2.Lerp(_triangleCache.uvs[0], _triangleCache.uvs[1], normalizedDistance);
_newTriangleCache.normals[0] = Vector3.Lerp(_triangleCache.normals[0], _triangleCache.normals[1], normalizedDistance);
_newTriangleCache.tangents[0] = Vector4.Lerp(_triangleCache.tangents[0], _triangleCache.tangents[1], normalizedDistance);
edgeVector = _triangleCache.vertices[2] - _triangleCache.vertices[0];
_blade.Raycast(new Ray(_triangleCache.vertices[0], edgeVector.normalized), out distance);
normalizedDistance = distance / edgeVector.magnitude;
_newTriangleCache.vertices[1] = Vector3.Lerp(_triangleCache.vertices[0], _triangleCache.vertices[2], normalizedDistance);
_newTriangleCache.uvs[1] = Vector2.Lerp(_triangleCache.uvs[0], _triangleCache.uvs[2], normalizedDistance);
_newTriangleCache.normals[1] = Vector3.Lerp(_triangleCache.normals[0], _triangleCache.normals[2], normalizedDistance);
_newTriangleCache.tangents[1] = Vector4.Lerp(_triangleCache.tangents[0], _triangleCache.tangents[2], normalizedDistance);
if (_newTriangleCache.vertices[0] != _newTriangleCache.vertices[1])
{
//tracking newly created points
_newVerticesCache.Add(_newTriangleCache.vertices[0]);
_newVerticesCache.Add(_newTriangleCache.vertices[1]);
}
// make the new triangles
// one side will get 1 the other will get 2
if (leftCount == 1)
{
// first one on the left
_triangleCache.vertices[0] = _leftTriangleCache.vertices[0];
_triangleCache.uvs[0] = _leftTriangleCache.uvs[0];
_triangleCache.normals[0] = _leftTriangleCache.normals[0];
_triangleCache.tangents[0] = _leftTriangleCache.tangents[0];
_triangleCache.vertices[1] = _newTriangleCache.vertices[0];
_triangleCache.uvs[1] = _newTriangleCache.uvs[0];
_triangleCache.normals[1] = _newTriangleCache.normals[0];
_triangleCache.tangents[1] = _newTriangleCache.tangents[0];
_triangleCache.vertices[2] = _newTriangleCache.vertices[1];
_triangleCache.uvs[2] = _newTriangleCache.uvs[1];
_triangleCache.normals[2] = _newTriangleCache.normals[1];
_triangleCache.tangents[2] = _newTriangleCache.tangents[1];
// check if it is facing the right way
NormalCheck(ref _triangleCache);
// add it
_leftSide.AddTriangle(_triangleCache, submesh);
// other two on the right
_triangleCache.vertices[0] = _rightTriangleCache.vertices[0];
_triangleCache.uvs[0] = _rightTriangleCache.uvs[0];
_triangleCache.normals[0] = _rightTriangleCache.normals[0];
_triangleCache.tangents[0] = _rightTriangleCache.tangents[0];
_triangleCache.vertices[1] = _newTriangleCache.vertices[0];
_triangleCache.uvs[1] = _newTriangleCache.uvs[0];
_triangleCache.normals[1] = _newTriangleCache.normals[0];
_triangleCache.tangents[1] = _newTriangleCache.tangents[0];
_triangleCache.vertices[2] = _newTriangleCache.vertices[1];
_triangleCache.uvs[2] = _newTriangleCache.uvs[1];
_triangleCache.normals[2] = _newTriangleCache.normals[1];
_triangleCache.tangents[2] = _newTriangleCache.tangents[1];
// check if it is facing the right way
NormalCheck(ref _triangleCache);
// add it
_rightSide.AddTriangle(_triangleCache, submesh);
// third
_triangleCache.vertices[0] = _rightTriangleCache.vertices[0];
_triangleCache.uvs[0] = _rightTriangleCache.uvs[0];
_triangleCache.normals[0] = _rightTriangleCache.normals[0];
_triangleCache.tangents[0] = _rightTriangleCache.tangents[0];
_triangleCache.vertices[1] = _rightTriangleCache.vertices[1];
_triangleCache.uvs[1] = _rightTriangleCache.uvs[1];
_triangleCache.normals[1] = _rightTriangleCache.normals[1];
_triangleCache.tangents[1] = _rightTriangleCache.tangents[1];
_triangleCache.vertices[2] = _newTriangleCache.vertices[1];
_triangleCache.uvs[2] = _newTriangleCache.uvs[1];
_triangleCache.normals[2] = _newTriangleCache.normals[1];
_triangleCache.tangents[2] = _newTriangleCache.tangents[1];
// check if it is facing the right way
NormalCheck(ref _triangleCache);
// add it
_rightSide.AddTriangle(_triangleCache, submesh);
}
else
{
// first one on the right
_triangleCache.vertices[0] = _rightTriangleCache.vertices[0];
_triangleCache.uvs[0] = _rightTriangleCache.uvs[0];
_triangleCache.normals[0] = _rightTriangleCache.normals[0];
_triangleCache.tangents[0] = _rightTriangleCache.tangents[0];
_triangleCache.vertices[1] = _newTriangleCache.vertices[0];
_triangleCache.uvs[1] = _newTriangleCache.uvs[0];
_triangleCache.normals[1] = _newTriangleCache.normals[0];
_triangleCache.tangents[1] = _newTriangleCache.tangents[0];
_triangleCache.vertices[2] = _newTriangleCache.vertices[1];
_triangleCache.uvs[2] = _newTriangleCache.uvs[1];
_triangleCache.normals[2] = _newTriangleCache.normals[1];
_triangleCache.tangents[2] = _newTriangleCache.tangents[1];
// check if it is facing the right way
NormalCheck(ref _triangleCache);
// add it
_rightSide.AddTriangle(_triangleCache, submesh);
// other two on the left
_triangleCache.vertices[0] = _leftTriangleCache.vertices[0];
_triangleCache.uvs[0] = _leftTriangleCache.uvs[0];
_triangleCache.normals[0] = _leftTriangleCache.normals[0];
_triangleCache.tangents[0] = _leftTriangleCache.tangents[0];
_triangleCache.vertices[1] = _newTriangleCache.vertices[0];
_triangleCache.uvs[1] = _newTriangleCache.uvs[0];
_triangleCache.normals[1] = _newTriangleCache.normals[0];
_triangleCache.tangents[1] = _newTriangleCache.tangents[0];
_triangleCache.vertices[2] = _newTriangleCache.vertices[1];
_triangleCache.uvs[2] = _newTriangleCache.uvs[1];
_triangleCache.normals[2] = _newTriangleCache.normals[1];
_triangleCache.tangents[2] = _newTriangleCache.tangents[1];
// check if it is facing the right way
NormalCheck(ref _triangleCache);
// add it
_leftSide.AddTriangle(_triangleCache, submesh);
// third
_triangleCache.vertices[0] = _leftTriangleCache.vertices[0];
_triangleCache.uvs[0] = _leftTriangleCache.uvs[0];
_triangleCache.normals[0] = _leftTriangleCache.normals[0];
_triangleCache.tangents[0] = _leftTriangleCache.tangents[0];
_triangleCache.vertices[1] = _leftTriangleCache.vertices[1];
_triangleCache.uvs[1] = _leftTriangleCache.uvs[1];
_triangleCache.normals[1] = _leftTriangleCache.normals[1];
_triangleCache.tangents[1] = _leftTriangleCache.tangents[1];
_triangleCache.vertices[2] = _newTriangleCache.vertices[1];
_triangleCache.uvs[2] = _newTriangleCache.uvs[1];
_triangleCache.normals[2] = _newTriangleCache.normals[1];
_triangleCache.tangents[2] = _newTriangleCache.tangents[1];
// check if it is facing the right way
NormalCheck(ref _triangleCache);
// add it
_leftSide.AddTriangle(_triangleCache, submesh);
}
}