///////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// ClipPoly
/// # Return clip poly for actual poly
/// </summary>
///////////////////////////////////////////////////////////////////////////////////////////////////////
public static GenericPoly ClipPoly(GenericPoly actualPoly, Plane plane)
{
//Debug.Log ("ClipPoly");
bool[] positive = new bool[vertexNumber];
int positiveCount = 0;
for (int i = 0; i < actualPoly.vertexList.Count; i++)
{
positive [i] = !plane.GetSide(actualPoly.vertexList [i]);
if (positive [i])
{
positiveCount++;
}
}
if (positiveCount == 0)
{
return(null);
}
if (positiveCount == actualPoly.vertexList.Count)
{
return(actualPoly);
}
GenericPoly temporalPoly = new GenericPoly();
for (int i = 0; i < actualPoly.vertexList.Count; i++)
{
int next = i + 1;
next %= actualPoly.vertexList.Count;
if (positive [i])
{
temporalPoly.vertexList.Add(actualPoly.vertexList [i]);
}
if (positive [i] != positive [next])
{
Vector3 v1 = actualPoly.vertexList [next];
Vector3 v2 = actualPoly.vertexList [i];
Vector3 v = BasicFunctions.LineCast(plane, v1, v2);
temporalPoly.vertexList.Add(v);
}
}
return(temporalPoly);
}
///////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// AddPoly
/// # Add a poly
/// </summary>
///////////////////////////////////////////////////////////////////////////////////////////////////////
private static void AddPoly(GenericPoly poly, Vector3 normal)
{
int ind1 = AddVertex(poly.vertexList [0], normal);
for (int i = 1; i < poly.vertexList.Count - 1; i++)
{
int ind2 = AddVertex(poly.vertexList [i], normal);
int ind3 = AddVertex(poly.vertexList [i + 1], normal);
indexBufferList.Add(ind1);
indexBufferList.Add(ind2);
indexBufferList.Add(ind3);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// BuildDecalForObject
/// # Build a decal for one of the affected objects
/// </summary>
///////////////////////////////////////////////////////////////////////////////////////////////////////
public static void BuildDecalForObject(GenericMeshDecal decal, GameObject affectedObject)
{
if (affectedObject.isStatic)
{
Debug.Log("NOTE: static objects are not supported by realtime mesh decals, we are trying to make it possible soon");
}
else
{
Mesh affectedMesh = affectedObject.GetComponent <MeshFilter> ().sharedMesh;
if (affectedMesh == null)
{
return;
}
float angleLimit = decal.angleLimit;
Plane right = new Plane(Vector3.right, Vector3.right / 2f);
Plane left = new Plane(-Vector3.right, -Vector3.right / 2f);
Plane top = new Plane(Vector3.up, Vector3.up / 2f);
Plane bottom = new Plane(-Vector3.up, -Vector3.up / 2f);
Plane front = new Plane(Vector3.forward, Vector3.forward / 2f);
Plane back = new Plane(-Vector3.forward, -Vector3.forward / 2f);
Vector3[] vertices = affectedMesh.vertices;
int[] triangles = affectedMesh.triangles;
int startVertexCount = vertexBufferList.Count;
Matrix4x4 matrix = decal.transform.worldToLocalMatrix * affectedObject.transform.localToWorldMatrix;
for (int i = 0; i < triangles.Length; i += 3)
{
int i1 = triangles [i];
int i2 = triangles [i + 1];
int i3 = triangles [i + 2];
Vector3 v1 = matrix.MultiplyPoint(vertices [i1]);
Vector3 v2 = matrix.MultiplyPoint(vertices [i2]);
Vector3 v3 = matrix.MultiplyPoint(vertices [i3]);
Vector3 side1 = v2 - v1;
Vector3 side2 = v3 - v1;
Vector3 normal = Vector3.Cross(side1, side2).normalized;
if (Vector3.Angle(-Vector3.forward, normal) >= angleLimit)
{
continue;
}
GenericPoly poly = new GenericPoly(v1, v2, v3);
poly = GenericPoly.ClipPoly(poly, right);
if (poly == null)
{
continue;
}
poly = GenericPoly.ClipPoly(poly, left);
if (poly == null)
{
continue;
}
poly = GenericPoly.ClipPoly(poly, top);
if (poly == null)
{
continue;
}
poly = GenericPoly.ClipPoly(poly, bottom);
if (poly == null)
{
continue;
}
poly = GenericPoly.ClipPoly(poly, front);
if (poly == null)
{
continue;
}
poly = GenericPoly.ClipPoly(poly, back);
if (poly == null)
{
continue;
}
AddPoly(poly, normal);
}
GenerateTexCoords(startVertexCount, decal.sprite);
}
}
