public static void ExportTo3DS(string filePath, GeometryModel3D modelData, Image textureFileData)
{
//sanity checks
if (modelData == null)
{
throw new ArgumentException("Geometry model info not supplied.");
}
if (!(modelData.Geometry != null && modelData.Geometry is MeshGeometry3D))
{
throw new ArgumentException("Passed model is not of type mesh geometry 3d");
}
//read specific values from xaml file
var modelColor = GetModelColor(modelData);
var mesh = ((MeshGeometry3D)modelData.Geometry);
var containsTextureInfo = ContainsTextureInfo(mesh);
var positionCount = mesh.Positions.Count;
var points = mesh.Positions;
var textures = mesh.TextureCoordinates;
var polygons = mesh.TriangleIndices;
//Open the 3DS file for writing
var writer = InitializeFile(filePath);
//Write Material Info
var textureFileName = MakeTextureFileName(filePath);
MaterialChunkWriter.WriteMaterialChunk(modelColor, containsTextureInfo, textureFileName, writer);
var objectCount = 0;
_3DSObjectDataHandler objHandler = null;
ushort[] setIndicesForObj = null;
bool[] isIndicesSetForObj = null;
ushort positionIndexInObj = 0;
for (var ctr = 0; ctr < polygons.Count; ctr += 3)
{
var createNewObject = objHandler == null ||
objHandler.PolygonCount >= MaxValForUnsignedShort ||
objHandler.TextureCoodCount >= MaxValForUnsignedShort ||
objHandler.VertexCount >= MaxValForUnsignedShort;
if (createNewObject)
{
if (objHandler != null)
{
objHandler.MakeFinalUpdates();
}
objectCount++;
if (objectCount > 9999)
{
throw new Exception("Error: Cannot create 3ds file.\n The number of objects into which the model can be broken down exceeds 9999");
}
objHandler = new _3DSObjectDataHandler(writer, objectCount);
setIndicesForObj = new ushort[positionCount];
isIndicesSetForObj = new bool[positionCount];
positionIndexInObj = 0;
}
var origIndices = new[] { (ushort)polygons[ctr], (ushort)polygons[ctr + 1], (ushort)polygons[ctr + 2] };
var newIndices = new List <ushort>();
foreach (var origIndex in origIndices)
{
if (isIndicesSetForObj[origIndex])
{
newIndices.Add(setIndicesForObj[origIndex]);
}
else
{//Add the new position
//Interchange y and z coordinates and change the sign of y to accomodate
//the difference in the axes orientation between the 3ds and xaml format
var origPoint = points[origIndex];
var point = new Point3D(origPoint.X, -origPoint.Z, origPoint.Y);
objHandler.AddPosition(point);
if (textures != null && textures.Count > origIndex)
{
var texCood = mesh.TextureCoordinates[origIndex];
objHandler.AddTextureIndices((float)texCood.X, (float)texCood.Y);
}
setIndicesForObj[origIndex] = positionIndexInObj;
isIndicesSetForObj[origIndex] = true;
newIndices.Add(positionIndexInObj);
positionIndexInObj++;
}
}
objHandler.AddPolygonIndices(newIndices[0], newIndices[1], newIndices[2]);
}
//Make the final updation call on object data handler
if (objHandler != null)
{
objHandler.MakeFinalUpdates();
}
//Close the 3ds file (after final updations to the header chunks)
UpdateAndCloseFile(writer);
//save the texture image data
SaveTextureImageData(filePath, textureFileData, textureFileName);
}
