static void AddPolygon(DecalPolygon poly, Vector3 normal)
{
// int ind1 = AddVertex(poly.vertices[0], normal);
for (int i = 1; i < poly.vertices.Count - 1; i++)
{
int ind2 = AddVertex(poly.vertices[i], normal);
int ind3 = AddVertex(poly.vertices[i + 1], normal);
int ind1 = AddVertex(poly.vertices[0], normal);
bufIndices.Add(ind1);
bufIndices.Add(ind2);
bufIndices.Add(ind3);
}
}
public static DecalPolygon ClipPolygon(DecalPolygon polygon, Plane plane)
{
bool[] positive = new bool[9];
int positiveCount = 0;
for (int i = 0; i < polygon.vertices.Count; i++)
{
positive[i] = !plane.GetSide(polygon.vertices[i]);
if (positive[i])
{
positiveCount++;
}
}
if (positiveCount == 0)
{
return(null); // полностью за плоскостью
}
if (positiveCount == polygon.vertices.Count)
{
return(polygon); // полностью перед плоскостью
}
DecalPolygon tempPolygon = new DecalPolygon();
for (int i = 0; i < polygon.vertices.Count; i++)
{
int next = i + 1;
next %= polygon.vertices.Count;
if (positive[i])
{
tempPolygon.vertices.Add(polygon.vertices[i]);
}
if (positive[i] != positive[next])
{
Vector3 v1 = polygon.vertices[next];
Vector3 v2 = polygon.vertices[i];
Vector3 v = LineCast(plane, v1, v2);
tempPolygon.vertices.Add(v);
}
}
return(tempPolygon);
}
public static void CreateDecalMeshStatic()
{
int startVertexCount = bufVertices.Count;
Matrix4x4 matrix = decal.transform.worldToLocalMatrix * affectedObject.transform.localToWorldMatrix;
for (int i = 0; i < triangles.Length; i += 3)
{
Vector3 v1 = matrix.MultiplyPoint(vertices[triangles[i]]);
Vector3 v2 = matrix.MultiplyPoint(vertices[triangles[i + 1]]);
Vector3 v3 = matrix.MultiplyPoint(vertices[triangles[i + 2]]);
Vector3 normal = Vector3.Cross(v2 - v1, v3 - v1).normalized;
if (!FacingNormal(triangles[i], triangles[i + 1], triangles[i + 2]))
{
continue;
}
DecalPolygon poly = new DecalPolygon(v1, v2, v3);
poly = DecalPolygon.ClipPolygon(poly, DecalPolygon.right);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, DecalPolygon.left);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, DecalPolygon.top);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, DecalPolygon.bottom);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, DecalPolygon.front);
if (poly == null)
{
continue;
}
poly = DecalPolygon.ClipPolygon(poly, DecalPolygon.back);
if (poly == null)
{
continue;
}
AddPolygon(poly, normal);
}
GenerateTexCoords(startVertexCount, decal.decalDefinition.sprite);
decalMesh = StaticCreateMesh();
decal.SetMesh(decalMesh);
}
