public SimpleVertexAdder(Mesh <TVertex> .Builder builder,
ObjFileVertexParser <TVertex> parser, ObjFileMesh owner)
{
this.builder = builder;
this.parser = parser;
this.owner = owner;
}
private TVertex createVertex <TVertex>(
Face.VertexIds ids, ObjFileVertexParser <TVertex> parser)
where TVertex : struct
{
var position = this.positions[ids.Position];
var uv = ids.UV < 2
? new Vector3(0)
: this.uvCoordinates[ids.UV];
var normal = ids.UV < 0
? new Vector3(0)
: this.normals[ids.Normal];
return(parser(position, uv, normal));
}
private static ObjFileVertexParser <TVertex> normalizeNormal <TVertex>(ObjFileVertexParser <TVertex> parser)
where TVertex : struct
{
return((p, uv, n) =>
{
var normalLength = n.LengthSquared;
if (normalLength > 0)
{
n = n / (float)Math.Sqrt(normalLength);
}
return parser(p, uv, n);
});
}
/// <summary>
/// Creates a mesh from the loaded obj file for further processing and rendering.
/// </summary>
/// <param name="vertexParser">A function creating mesh vertices from position, uv coordinate and normal.</param>
/// <param name="mergeVertices">Whether to merge and reuse identical vertices.</param>
/// <param name="normalizeNormals">Whether to normalise normals before creating the mesh vertex.</param>
public Mesh <TVertex> ToMesh <TVertex>(
ObjFileVertexParser <TVertex> vertexParser,
bool mergeVertices = true,
bool normalizeNormals = true)
where TVertex : struct
{
this.ensureStats();
if (normalizeNormals)
{
vertexParser = normalizeNormal(vertexParser);
}
var builder = new Mesh <TVertex> .Builder(
mergeVertices? 0 : this.totalFaceVertexCount);
var vertexAdder = mergeVertices
? new SimpleVertexAdder <TVertex>(builder, vertexParser, this)
: new MergedVertexDictionary <TVertex>(builder, vertexParser, this);
return(this.toMesh(builder, vertexAdder));
}
public MergedVertexDictionary(Mesh <TVertex> .Builder builder,
ObjFileVertexParser <TVertex> parser, ObjFileMesh owner)
: base(builder, parser, owner)
{
}
