public void AddVertices(OBJVertex[] vertex, GeometryPrimitiveTopologies topology)
{
//one group can have several topologies
//example:
//f 74513/2367/55537 74560/2366/55584 74514/2368/55538
//f 74514/2275/55538 74561/2369/55585 74562/2370/55586 74515/2276/55539
//convert to one topology to simplify post processing
switch (topology)
{
case GeometryPrimitiveTopologies.TriangleList:
Vertices.Add(vertex[0]);
Vertices.Add(vertex[1]);
Vertices.Add(vertex[2]);
cache.VertexCount += 3;
break;
case GeometryPrimitiveTopologies.TriangleFan:
//suport triangle fan format https://en.wikipedia.org/wiki/Triangle_fan
//https://docs.microsoft.com/en-us/windows/win32/direct3d9/triangle-fans
Vertices.Add(vertex[0]);
Vertices.Add(vertex[1]);
Vertices.Add(vertex[2]);
Vertices.Add(vertex[0]);
Vertices.Add(vertex[2]);
Vertices.Add(vertex[3]);
cache.VertexCount += 6;
break;
}
}
public ImmutableGeometryData(IReadOnlyCollection <Vector3> positions,
IReadOnlyCollection <Vector3> normals, IReadOnlyCollection <int> indices,
IReadOnlyCollection <Vector2> texCoor, IReadOnlyCollection <Vector4> colors)
{
Positions = positions == null ? ImmutableArray <Vector3> .Empty : positions.ToImmutableArray();
Normals = normals == null ? ImmutableArray <Vector3> .Empty : positions.ToImmutableArray();
Indices = indices == null ? ImmutableArray <int> .Empty : indices.ToImmutableArray();
TexCoor = texCoor == null ? ImmutableArray <Vector2> .Empty : texCoor.ToImmutableArray();
Colors = colors == null ? ImmutableArray <Vector4> .Empty : colors.ToImmutableArray();
IsModified = true;
Topology = GeometryPrimitiveTopologies.TriangleList;
}
public GeometryData(
string group,
List <Vector3> positions,
List <Vector3> normals,
List <Vector3> colors,
List <int> indices,
List <Vector2> textureCoors,
GeometryPrimitiveTopologies topology)
{
Positions = positions.AsReadOnly();
Normals = normals.AsReadOnly();
Colors = colors.AsReadOnly();
Indices = indices.AsReadOnly();
TextureCoors = textureCoors.AsReadOnly();
Name = group;
Topology = topology;
}
