private StlTriangle ReadTriangle()
{
StlTriangle stlTriangle = null;
if (_isAscii)
{
switch (PeekToken())
{
case "facet":
AdvanceToken();
SwallowToken("normal");
var normal = new StlNormal(ConsumeNumberToken(), ConsumeNumberToken(), ConsumeNumberToken());
SwallowToken("outer");
SwallowToken("loop");
SwallowToken("vertex");
var v1 = ConsumeVertexToken();
SwallowToken("vertex");
var v2 = ConsumeVertexToken();
SwallowToken("vertex");
var v3 = ConsumeVertexToken();
SwallowToken("endloop");
SwallowToken("endfacet");
stlTriangle = new StlTriangle(normal, v1, v2, v3);
break;
case "endsolid":
return(null);
default:
throw new StlReadException("Unexpected token " + PeekToken());
}
}
return(stlTriangle);
}
public List <StlTriangle> ReadTriangles()
{
var triangles = new List <StlTriangle>();
if (_isAscii)
{
var t = ReadTriangle();
while (t != null)
{
EnsureCorrectNormal(t);
triangles.Add(t);
t = ReadTriangle();
}
}
else
{
for (uint i = 0; i < _triangleCount; i++)
{
// normal should equal (v3-v2)x(v1-v1)
var normal = new StlNormal(ReadFloatBinary(), ReadFloatBinary(), ReadFloatBinary());
var v1 = ReadVertexBinary();
var v2 = ReadVertexBinary();
var v3 = ReadVertexBinary();
_binReader.ReadUInt16(); // attribute byte count; garbage value
var t = new StlTriangle(normal, v1, v2, v3);
EnsureCorrectNormal(t);
triangles.Add(t);
}
}
return(triangles);
}
private static string NormalToString(StlNormal normal)
{
return
($"{normal.X.ToString(FloatFormat)} {normal.Y.ToString(FloatFormat)} {normal.Z.ToString(FloatFormat)}");
}
