private void RecalculateNormals(Mesh mesh, float angle, int[] triangles, Vector3[] vertices, bool instant = false)
{
if (triangles == null)
{
if (meshInfoCache == null)
{
meshInfoCache = new Dictionary <Mesh, KeyValuePair <int[], Vector3[]> >();
}
if (meshInfoCache.ContainsKey(mesh))
{
triangles = meshInfoCache[mesh].Key;
vertices = meshInfoCache[mesh].Value;
}
else
{
triangles = mesh.GetTriangles(0);
vertices = mesh.vertices;
meshInfoCache.Add(mesh, new KeyValuePair <int[], Vector3[]>(triangles, vertices));
}
}
var triNormals = AllocatedArray <Vector3> .Get(triangles.Length / 3);
var normals = AllocatedArray <Vector3> .Get(vertices.Length);
angle = angle * Mathf.Deg2Rad;
var dictionary = PooledDictionary <Vector3, VertexEntry> .Get(vertices.Length, VectorComparer);
//Goes through all the triangles and gathers up data to be used later
for (var i = 0; i < triangles.Length; i += 3)
{
int i1 = triangles[i];
int i2 = triangles[i + 1];
int i3 = triangles[i + 2];
//Calculate the normal of the triangle
Vector3 p1 = vertices[i2] - vertices[i1];
Vector3 p2 = vertices[i3] - vertices[i1];
Vector3 normal = Vector3.Cross(p1, p2).normalized;
int triIndex = i / 3;
triNormals[triIndex] = normal;
VertexEntry entry;
//VertexKey key;
//For each of the three points of the triangle
// > Add this triangle as part of the triangles they're connected to.
if (!dictionary.TryGetValue(vertices[i1], out entry))
{
entry = GenericObjectPool <VertexEntry> .Get();
entry.PopulateArrays();
dictionary.Add(vertices[i1], entry);
}
entry.Add(i1, triIndex);
if (!dictionary.TryGetValue(vertices[i2], out entry))
{
entry = GenericObjectPool <VertexEntry> .Get();
entry.PopulateArrays();
dictionary.Add(vertices[i2], entry);
}
entry.Add(i2, triIndex);
if (!dictionary.TryGetValue(vertices[i3], out entry))
{
entry = GenericObjectPool <VertexEntry> .Get();
entry.PopulateArrays();
dictionary.Add(vertices[i3], entry);
}
entry.Add(i3, triIndex);
}
foreach (var kvp in dictionary)
{
var value = kvp.Value;
for (var i = 0; i < value.Count; ++i)
{
var sum = new Vector3();
for (var j = 0; j < value.Count; ++j)
{
if (value.VertexIndex[i] == value.VertexIndex[j])
{
sum += triNormals[value.TriangleIndex[j]];
}
else
{
float dot = Vector3.Dot(
triNormals[value.TriangleIndex[i]],
triNormals[value.TriangleIndex[j]]);
dot = Mathf.Clamp(dot, -0.99999f, 0.99999f);
float acos = Mathf.Acos(dot);
if (acos <= angle)
{
sum += triNormals[value.TriangleIndex[j]];
}
}
}
normals[value.VertexIndex[i]] = sum.normalized;
}
value.Clear();
GenericObjectPool <VertexEntry> .Return(value);
}
dictionary.ReturnToPool();
if (instant == false)
{
if (mainThreadActions == null)
{
mainThreadActions = new Queue <System.Action>();
}
mainThreadActions.Enqueue(() =>
{
if (mesh)
{
mesh.normals = normals;
}
AllocatedArray <Vector3> .Return(normals, false);
});
}
else
{
mesh.normals = normals;
AllocatedArray <Vector3> .Return(normals, false);
}
}