public void InitializeBulkMesh(List <GNS_Model> Meshes, List <float> Percentiles, int MaxVertCount, int LODIndex, Vector3 BoundSize)
{
_BulkMesh = new Mesh();
// Calculate Mesh Indexes
int BulkMeshVertCount = 0;
List <int> MeshIndexes = new List <int> ();
while (BulkMeshVertCount < MaxVertCount) // loop until mesh is full
{
int RandomIndex = WeightedRandom(Percentiles); // get random mesh index
Mesh RandomMesh = Meshes [RandomIndex].LODMeshes[0]; // get random mesh
if (BulkMeshVertCount + RandomMesh.vertexCount > MaxVertCount)
{
break;
} // cant add cause it exceeds limit
BulkMeshVertCount += RandomMesh.vertexCount;
MeshIndexes.Add(RandomIndex); // add index to index list
}
// Generate combined mesh
int BulkMeshTextureSize = Mathf.CeilToInt(Mathf.Sqrt(MeshIndexes.Count));
CombineInstance[] CombinedMeshes = new CombineInstance[MeshIndexes.Count];
for (int i = 0; i < MeshIndexes.Count; i++)
{
GNS_Model RandomModel = Meshes [MeshIndexes [i]]; // get random mesh
Mesh RandomMesh = RandomModel.GetLODMesh(LODIndex); // get mesh
Mesh TempMesh = new Mesh();
// Copy data into temp mesh
TempMesh.vertices = RandomMesh.vertices; // copy verts
TempMesh.triangles = RandomMesh.triangles; // copy triangles
TempMesh.normals = RandomMesh.normals; // copy normals
TempMesh.tangents = RandomMesh.tangents; // copy tangents
TempMesh.uv = RandomMesh.uv; // copy uvs
// Generate uv2 coords
Vector2[] uv2 = new Vector2[TempMesh.vertexCount];
Vector2[] uv3 = new Vector2[TempMesh.vertexCount];
int Row = (int)(i / BulkMeshTextureSize); // calculate texture row
int Colum = i - (Row * BulkMeshTextureSize); // calulate texture colum
Vector2 InstanceUV2 = new Vector2( // generate uv2
((float)Colum) / (float)(BulkMeshTextureSize), // calculate relative uv2 coord
((float)Row) / (float)(BulkMeshTextureSize) // calculate relative uv2 coord
);
Vector2 WindInfluence = new Vector2(RandomModel.WindInfluence, (RandomModel.CustomNormals)?0f:1f);
for (int x = 0; x < uv2.Length; x++)
{
uv2 [x] = InstanceUV2;
uv3 [x] = WindInfluence;
} // set all uv2 coords
// Set
TempMesh.uv2 = uv2; // set uv2 coords of temp mesh
TempMesh.uv3 = uv3;
CombinedMeshes [i].mesh = TempMesh; // set combine instance mesh
CombinedMeshes [i].transform = Matrix4x4.TRS(Vector3.zero, Quaternion.identity, Vector3.one); // set transform of combine instance
}
// Final combination of meshes
_BulkMesh.CombineMeshes(CombinedMeshes); // combine meshes into bulk mesh
_BulkMesh.bounds = new Bounds(_BulkMesh.bounds.center, BoundSize); // set bound size
_TotalMeshCount = MeshIndexes.Count; // set total mesh count
}