private static GameObject[] Build(DecalMeshBuilder builder, Decal decal, GameObject[] targets)
{
MeshFilter filter = decal.meshFilter;
MeshRenderer renderer = decal.meshRenderer;
if (decal.Material == null || decal.sprite == null)
{
filter.mesh.Clear();
renderer.material = null;
return(null);
}
var objects = DecalUtils.GetAffectedMeshFilter(decal, targets);
foreach (var obj in objects)
{
Build(builder, decal, obj);
}
builder.Push(PlanetMaker.instance.PushDistance);
if (filter.mesh == null)
{
filter.mesh = new Mesh();
filter.mesh.name = "Decal";
}
builder.ToMesh(filter.sharedMesh);
renderer.material = decal.Material;
return(objects.Select(i => i.gameObject).ToArray());
}
private static void AddTriangle(DecalMeshBuilder builder, Decal decal, Vector3 v1, Vector3 v2, Vector3 v3)
{
Rect uvRect = To01(decal.sprite.textureRect, decal.sprite.texture);
Vector3 normal = Vector3.Cross(v2 - v1, v3 - v1).normalized;
if (Vector3.Angle(Vector3.forward, -normal) <= decal.MaxAngle)
{
var poly = PolygonClippingUtils.Clip(v1, v2, v3);
if (poly.Length > 0)
{
builder.AddPolygon(poly, normal, uvRect);
}
}
}
private static void Build(DecalMeshBuilder builder, Decal decal, MeshFilter pobject)
{
Matrix4x4 objToDecalMatrix = decal.transform.worldToLocalMatrix * pobject.transform.localToWorldMatrix;
Mesh mesh = pobject.sharedMesh;
Vector3[] vertices = mesh.vertices;
int[] triangles = mesh.triangles;
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 = objToDecalMatrix.MultiplyPoint(vertices[i1]);
Vector3 v2 = objToDecalMatrix.MultiplyPoint(vertices[i2]);
Vector3 v3 = objToDecalMatrix.MultiplyPoint(vertices[i3]);
AddTriangle(builder, decal, v1, v2, v3);
}
}
