/// <summary>
/// Adds a face to the edge's face list if the face index is in range. (Some
/// shapes, such as "plate / alloys", use $ff for their edge face value even
/// though fewer than 16 faces are defined.)
/// </summary>
private void AddEdgeFace(VisWireframe vw, int eindex, int face, int faceCount)
{
if (face < faceCount)
{
vw.AddEdgeFace(eindex, face);
}
}
private IVisualizationWireframe GenerateWireframe(ReadOnlyDictionary <string, object> parms)
{
int offset = Util.GetFromObjDict(parms, P_OFFSET, 0);
if (offset < 0 || offset >= mFileData.Length)
{
// should be caught by editor
mAppRef.ReportError("Invalid parameter");
return(null);
}
VisWireframe vw = new VisWireframe();
const sbyte END_MARKER = -128; // 0x80
try {
while (true)
{
int vx = (sbyte)mFileData[offset++];
if (vx == END_MARKER)
{
break;
}
int vy = (sbyte)mFileData[offset++];
int vz = (sbyte)mFileData[offset++];
vw.AddVertex(vx, vy, vz);
}
while (true)
{
int v0 = (sbyte)mFileData[offset++];
if (v0 == END_MARKER)
{
break;
}
int v1 = mFileData[offset++];
int f0 = mFileData[offset++];
int f1 = mFileData[offset++];
int edge = vw.AddEdge(v0, v1);
vw.AddEdgeFace(edge, f0);
if (f1 != f0)
{
vw.AddEdgeFace(edge, f1);
}
}
while (true)
{
int nx = (sbyte)mFileData[offset++];
if (nx == END_MARKER)
{
break;
}
int ny = (sbyte)mFileData[offset++];
int nz = (sbyte)mFileData[offset++];
vw.AddFaceNormal(nx, ny, nz);
}
} catch (IndexOutOfRangeException) {
// assume it was our file data access that caused the failure
mAppRef.ReportError("Ran off end of file");
return(null);
}
string msg;
if (!vw.Validate(out msg))
{
mAppRef.ReportError("Data error: " + msg);
return(null);
}
return(vw);
}