// NOTE: can't be run as part of NUnit because it requires the GC
public static void BigFileTest()
{
var nVerts = (300 * 1000 * 1000); // 300 * 12 = 3.6 GB
var vertices = nVerts.Select(i => new Vector3(i, i, i));
var bldr = new G3DBuilder();
bldr.AddVertices(vertices);
var g3d = bldr.ToG3D();
Assert.AreEqual(nVerts, g3d.NumVertices);
var tempFile = Path.Combine(Path.GetTempPath(), "bigfile.g3d");
g3d.Write(tempFile);
var tmp = G3D.Read(tempFile);
ValidateSameG3D(g3d, tmp);
}
public static G3D ToG3D(this Mesh mesh)
{
// The Assimp mesh must be triangulated
if (mesh.FaceCount == 0)
{
return(G3D.Empty);
}
var bldr = new G3DBuilder();
// Note: should be at most 3 for meses, but could 2 for lines, or 1 for point clouds
var numCornersPerFace = mesh.Faces[0].IndexCount;
if (numCornersPerFace > 3)
{
throw new Exception("The Assimp mesh must be triangulated as a post-process");
}
if (numCornersPerFace <= 0)
{
throw new Exception("The Assimp mesh has faces without indices");
}
foreach (var f in mesh.Faces)
{
if (f.IndexCount != numCornersPerFace)
{
throw new Exception($"Each face of the assimp mesh must have {numCornersPerFace} corners, but found one with {f.IndexCount}");
}
}
bldr.SetObjectFaceSize(numCornersPerFace);
var indices = mesh.GetIndices();
if (indices.Length % numCornersPerFace != 0)
{
throw new Exception($"The mesh index buffer length {indices.Length} is not divisible by {numCornersPerFace}");
}
bldr.AddVertices(mesh.Vertices.ToIArray().Select(ToMath3D));
bldr.AddIndices(indices);
if (mesh.HasTangentBasis)
{
bldr.Add(mesh.BiTangents.ToIArray().Select(ToMath3D).ToVertexBitangentAttribute());
}
if (mesh.HasTangentBasis)
{
bldr.Add(mesh.Tangents.ToIArray().Select(x => ToMath3D(x).ToVector4()).ToVertexTangentAttribute());
}
if (mesh.HasNormals)
{
bldr.Add(mesh.Normals.ToIArray().Select(ToMath3D).ToVertexNormalAttribute());
}
for (var i = 0; i < mesh.TextureCoordinateChannelCount; ++i)
{
var uvChannel = mesh.TextureCoordinateChannels[i];
bldr.Add(uvChannel.ToIArray().Select(ToMath3D).ToVertexUvwAttribute(i));
}
for (var i = 0; i < mesh.VertexColorChannelCount; ++i)
{
var vcChannel = mesh.VertexColorChannels[i];
bldr.Add(vcChannel.ToIArray().Select(ToMath3D).ToVertexColorAttribute(i));
}
return(bldr.ToG3D());
}