public static bool ClipPolygon(ref DecalPolygon polygon, Plane plane)
{
ResetPositive();
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(false);
}
if (positiveCount == polygon.vertices.Count)
{
return(true);
}
tempPolygon.Clear();
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);
}
}
polygon.CopyFrom(tempPolygon);
return(true);
}
public static void BuildDecalForObject(GameObject decal, GameObject affectedObject, Texture2D texture)
{
Mesh affectedMesh = null;
MeshCollider mc = affectedObject.GetComponent <MeshCollider>();
if (mc != null)
{
affectedMesh = mc.sharedMesh;
}
if (affectedMesh == null)
{
affectedMesh = GenarateTerrainMesh(affectedObject);
}
if (affectedMesh == null)
{
MeshFilter mf = affectedObject.GetComponent <MeshFilter>();
if (mf)
{
affectedMesh = mf.sharedMesh;
}
}
if (affectedMesh == null)
{
return;
}
float maxAngle = /*decal.maxAngle*/ 90.0f;
Vector3[] vertices = affectedMesh.vertices;
int[] triangles = affectedMesh.triangles;
int startVertexCount = bufVertices.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) >= maxAngle)
{
continue;
}
poly.Clear();
poly.SetVts(v1, v2, v3);
//DecalPolygon poly = new DecalPolygon();
//poly.SetVts(v1, v2, v3);
if (!DecalPolygon.ClipPolygon(ref poly, right))
{
continue;
}
if (!DecalPolygon.ClipPolygon(ref poly, left))
{
continue;
}
if (!DecalPolygon.ClipPolygon(ref poly, top))
{
continue;
}
if (!DecalPolygon.ClipPolygon(ref poly, bottom))
{
continue;
}
if (!DecalPolygon.ClipPolygon(ref poly, front))
{
continue;
}
if (!DecalPolygon.ClipPolygon(ref poly, back))
{
continue;
}
AddPolygon(poly, normal);
}
GenerateTexCoords(startVertexCount, texture);
}
