public static void BuildDecalForObject(CausticDecal decal, GameObject affectedObject)
{
Mesh affectedMesh = affectedObject.GetComponent <MeshFilter>().sharedMesh;
if (affectedMesh == null)
{
return;
}
float maxAngle = decal.maxAngle;
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 = 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;
}
CausticDecalPolygon poly = new CausticDecalPolygon(v1, v2, v3);
poly = CausticDecalPolygon.ClipPolygon(poly, right);
if (poly == null)
{
continue;
}
poly = CausticDecalPolygon.ClipPolygon(poly, left);
if (poly == null)
{
continue;
}
poly = CausticDecalPolygon.ClipPolygon(poly, top);
if (poly == null)
{
continue;
}
poly = CausticDecalPolygon.ClipPolygon(poly, bottom);
if (poly == null)
{
continue;
}
poly = CausticDecalPolygon.ClipPolygon(poly, front);
if (poly == null)
{
continue;
}
poly = CausticDecalPolygon.ClipPolygon(poly, back);
if (poly == null)
{
continue;
}
AddPolygon(poly, normal);
}
GenerateTexCoords(startVertexCount);
}
