/// <summary>
///
/// </summary>
/// <param name="meshes"></param>
/// <returns></returns>
private static Mesh UnityMeshFromMeshData(SpatialAwarenessSceneObject.MeshData meshData)
{
Mesh unityMesh = new Mesh();
// Unity has a limit of 65,535 vertices in a mesh.
// This limit exists because by default Unity uses 16-bit index buffers.
// Starting with 2018.1, Unity allows one to use 32-bit index buffers.
if (meshData.vertices.Length > 65535)
{
unityMesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;
}
unityMesh.SetVertices(new List <Vector3>(meshData.vertices));
unityMesh.SetIndices(meshData.indices, MeshTopology.Triangles, 0);
unityMesh.SetUVs(0, new List <Vector2>(meshData.uvs));
unityMesh.RecalculateNormals();
return(unityMesh);
}
private SpatialAwarenessSceneObject.MeshData MeshData(SceneMesh sceneMesh)
{
// Indices
var indices = new int[sceneMesh.TriangleIndexCount];
var meshIndices = new uint[sceneMesh.TriangleIndexCount];
sceneMesh.GetTriangleIndices(meshIndices);
var ilength = meshIndices.Length;
for (int i = 0; i < ilength; ++i)
{
indices[i] = (int)meshIndices[i];
}
// Vertices
var vertices = new UnityEngine.Vector3[sceneMesh.VertexCount];
var uvs = new UnityEngine.Vector2[sceneMesh.VertexCount];
var meshVertices = new System.Numerics.Vector3[sceneMesh.VertexCount];
sceneMesh.GetVertexPositions(meshVertices);
var vlength = meshVertices.Length;
var minx = meshVertices[0].X;
var miny = meshVertices[0].Y;
var maxx = minx;
var maxy = miny;
float x = minx;
float y = miny;
for (int i = 0; i < vlength; ++i)
{
x = meshVertices[i].X;
y = meshVertices[i].Y;
vertices[i] = new UnityEngine.Vector3(x, y, -meshVertices[i].Z);
minx = Math.Min(minx, x);
miny = Math.Min(miny, y);
maxx = Math.Max(maxx, x);
maxy = Math.Max(maxy, y);
}
// UVs - planar square projection
float smallestDimension = Math.Min(minx, miny);
float biggestDimension = Math.Max(maxx, maxy);
for (int i = 0; i < vlength; ++i)
{
uvs[i] = new Vector2(
Mathf.InverseLerp(smallestDimension, biggestDimension, vertices[i].x),
Mathf.InverseLerp(smallestDimension, biggestDimension, vertices[i].y));
}
var result = new SpatialAwarenessSceneObject.MeshData
{
indices = indices,
vertices = vertices,
guid = sceneMesh.Id,
uvs = uvs
};
return(result);
}
