public void ShowModel(Model3D model3D, bool updateCamera)
{
try
{
ContentVisual.SetCurrentValue(ModelVisual3D.ContentProperty, model3D);
// NOTE:
// We could show both solid model and wireframe in WireframeVisual3D (ContentWireframeVisual) with using WireframeWithOriginalSolidModel for WireframeType.
// But in this sample we show solid frame is separate ModelVisual3D and therefore we show only wireframe in WireframeVisual3D.
ContentWireframeVisual.BeginInit();
ContentWireframeVisual.SetCurrentValue(Ab3d.Visuals.WireframeVisual3D.ShowPolygonLinesProperty, ReadPolygonIndicesCheckBox.IsChecked ?? false);
ContentWireframeVisual.SetCurrentValue(Ab3d.Visuals.WireframeVisual3D.OriginalModelProperty, model3D);
ContentWireframeVisual.EndInit();
if (AddLineDepthBiasCheckBox.IsChecked ?? false)
{
// To specify line depth bias to the Ab3d.PowerToys line Visual3D objects,
// we use SetDXAttribute extension method and use LineDepthBias as DXAttributeType
// NOTE: This can be used only before the Visual3D is created by DXEngine.
// If you want to change the line bias after the object has been rendered, use the SetDepthBias method (see OnAddLineDepthBiasCheckBoxCheckedChanged)
//
// See DXEngineVisuals/LineDepthBiasSample for more info.
ContentWireframeVisual.SetDXAttribute(DXAttributeType.LineDepthBias, model3D.Bounds.GetDiagonalLength() * 0.001);
}
// Calculate the center of the model and its size
// This will be used to position the camera
if (updateCamera)
{
var bounds = model3D.Bounds;
var modelCenter = new Point3D(bounds.X + bounds.SizeX / 2,
bounds.Y + bounds.SizeY / 2,
bounds.Z + bounds.SizeZ / 2);
var modelSize = Math.Sqrt(bounds.SizeX * bounds.SizeX +
bounds.SizeY * bounds.SizeY +
bounds.SizeZ * bounds.SizeZ);
Camera1.TargetPosition = modelCenter;
Camera1.SetCurrentValue(Ab3d.Cameras.BaseTargetPositionCamera.DistanceProperty, modelSize * 2);
}
// If the read model already define some lights, then do not show the Camera's light
if (ModelUtils.HasAnyLight(model3D))
{
Camera1.SetCurrentValue(Ab3d.Cameras.BaseCamera.ShowCameraLightProperty, ShowCameraLightType.Never);
}
else
{
Camera1.SetCurrentValue(Ab3d.Cameras.BaseCamera.ShowCameraLightProperty, ShowCameraLightType.Always);
}
ShowInfoButton.SetCurrentValue(IsEnabledProperty, true);
}
catch
{
}
}
private void ShowModel(Model3D model3D, bool updateCamera)
{
ContentVisual.Content = model3D;
if (model3D == null)
{
return;
}
// NOTE:
// We could show both solid model and wireframe in WireframeVisual3D (ContentWireframeVisual) with using WireframeWithOriginalSolidModel for WireframeType.
// But in this sample we show solid frame is separate ModelVisual3D and therefore we show only wireframe in WireframeVisual3D.
ContentWireframeVisual.BeginInit();
ContentWireframeVisual.ShowPolygonLines = ReadPolygonIndicesCheckBox.IsChecked ?? false;
ContentWireframeVisual.OriginalModel = model3D;
ContentWireframeVisual.EndInit();
// Calculate the center of the model and its size
// This will be used to position the camera
if (updateCamera)
{
var bounds = model3D.Bounds;
var modelCenter = new Point3D(bounds.X + bounds.SizeX / 2,
bounds.Y + bounds.SizeY / 2,
bounds.Z + bounds.SizeZ / 2);
var modelSize = Math.Sqrt(bounds.SizeX * bounds.SizeX +
bounds.SizeY * bounds.SizeY +
bounds.SizeZ * bounds.SizeZ);
Camera1.TargetPosition = modelCenter;
Camera1.Distance = modelSize * 2;
}
// If the read model already define some lights, then do not show the Camera's light
if (ModelUtils.HasAnyLight(model3D))
{
Camera1.ShowCameraLight = ShowCameraLightType.Never;
}
else
{
Camera1.ShowCameraLight = ShowCameraLightType.Always;
}
ShowInfoButton.IsEnabled = true;
}
private void LoadObj(string fileName)
{
if (_isLoading)
{
return;
}
bool isNewFile = (_fileName != fileName);
_fileName = fileName;
_wpf3DModel = null;
// Set ReadPolygonIndices in UI thread
// When true ReaderObj will read PolygonIndices collection that can be used to show polygons instead of triangles
_readerObj.ReadPolygonIndices = ReadPolygonIndicesCheckBox.IsChecked ?? false;
// To read polygon indices from the read models,
// iterating through GeometryModel3D objects (children of Model3DGroup) and
// then converting its Geometry object into MeshGeometry3D.
// The MeshGeometry3D defines the Positions, TriangleIndices, Normals and TextureCoordinates collections.
//
// On top of that the Ab3d.PowerToys and ReaderObj can also add the polygon indices collection.
// It is set to MeshGeometry3D as a PolygonIndices dependency property (defined in Ab3d.Utilities.MeshUtils).
// You can read the PolygonIndices directly with the following:
//
// var polygonIndices = meshGeometry3D.GetValue(Ab3d.Utilities.MeshUtils.PolygonIndicesProperty) as Int32Collection;
//
// You can also use the GetPolygonIndices, SetPolygonIndices and GetPolygonPositions extension methods on MeshGeometry3D,
// or use GetPolygonPositions from MeshUtils.
//
// See also the following to get know how the polygon positions are organized:
// https://www.ab4d.com/help/PowerToys/html/F_Ab3d_Utilities_MeshUtils_PolygonIndicesProperty.htm
// UH: The following code is much much easier with async and await from .net 4.5
// But here we want to use only .net 4.0
// Read obj file and convert to wpf 3d objects in background thread
var readObjFileTask = new Task(() =>
{
_lastException = null;
try
{
string texturesPath = Path.GetDirectoryName(_fileName);
// Read obj file from _fileName
// We read the object names into objectNames dictionary (Dictionary<string, Model3D>)
// This allows us to quickly get objects from their name.
// ReaderObj also set name to all objects and materials with using SetName extension method
// This way you can get object name or material name with GetName method.
// For example:
// _wpf3DModel.GetName();
var defaultMaterial = new DiffuseMaterial(Brushes.Silver);
_wpf3DModel = _readerObj.ReadModel3D(_fileName, texturesPath, defaultMaterial);
if (_wpf3DModel != null)
{
// We need to freeze the model because it was created on another thread.
// After the model is forzen, it cannot be changed any more.
// if you want to change the model, than Convert method must be called on UI thread
// or you must clone the read object in the UI thread
_wpf3DModel.Freeze();
}
// NOTE:
// If we wanted more control over reading obj files, we could read them in two steps
// 1) Read obj file into ObjFileData object
// 2) Convert read ObjFileData object into WPF Model3D
// The following code does that (uncomment it to see it in action):
//var objFileData = _readerObj.ReadFile(_fileName);
////var objFileData = _readerObj.ReadStream(fileStream);
//var objMeshToWpfModel3DConverter = new ObjFileToWpfModel3DConverter();
//objMeshToWpfModel3DConverter.InvertYTextureCoordinate = false;
//objMeshToWpfModel3DConverter.TexturesDirectory = Path.GetDirectoryName(_fileName);
//// DefaultMaterial is a Material that is used when no other material is specified.
//// Actually with leaving DefaultMaterial as null, the same Silver material would be used (setting it here only to show the user what properties exist)
//objMeshToWpfModel3DConverter.DefaultMaterial = new DiffuseMaterial(Brushes.Silver);
//// ReuseMaterials specified if one material instance defined in obj file can be reused for all Model3D objects that use that material.
//// If false than a new material instance will be created for each usage
//// This is useful when user wants to change material on individual objects without applying the change to all other objects that use that material.
//// Default value is true.
//objMeshToWpfModel3DConverter.ReuseMaterials = true;
//_wpf3DModel = _objMeshToWpfModel3DConverter.Convert(objFileData);
}
catch (Exception ex)
{
_lastException = ex;
}
});
// After reading the obj file and converting it to WPF 3D objects we need to show the objects or errors - this needs to be done on UI thread
var showObjectTask = readObjFileTask.ContinueWith(_ =>
{
try
{
if (_lastException != null)
{
ResultTextBlock.Text = "ERROR reading obj file:\r\n" + _lastException.Message;
}
else if (_wpf3DModel != null)
{
string objectsDescriptions = Ab3d.Utilities.Dumper.GetObjectHierarchyString(_wpf3DModel);
if (_readerObj.Errors != null && _readerObj.Errors.Count > 0)
{
var sb = new StringBuilder();
sb.AppendLine("Obj file errors:");
foreach (var error in _readerObj.Errors)
{
sb.AppendLine(error);
}
ResultTextBlock.Text = objectsDescriptions + Environment.NewLine + Environment.NewLine + sb.ToString();
}
else
{
ResultTextBlock.Text = objectsDescriptions;
}
//ResultTextBlock.Text = Ab3d.Utilities.Dumper.GetMeshInitializationCode(model);
//ResultTextBlock.Text += "\r\n\n" + Ab3d.Utilities.Dumper.Dump(model);
ContentVisual.Content = _wpf3DModel;
// NOTE:
// We could show both solid model and wireframe in WireframeVisual3D (ContentWireframeVisual) with using WireframeWithOriginalSolidModel for WireframeType.
// But in this sample we show solid frame is separate ModelVisual3D and therefore we show only wireframe in WireframeVisual3D.
ContentWireframeVisual.BeginInit();
ContentWireframeVisual.ShowPolygonLines = ReadPolygonIndicesCheckBox.IsChecked ?? false;
ContentWireframeVisual.OriginalModel = _wpf3DModel;
ContentWireframeVisual.EndInit();
// Calculate the center of the model and its size
// This will be used to position the camera
if (isNewFile) // If we just reloaded the previous file, we preserve the current camera TargetPosition and Distance
{
var bounds = _wpf3DModel.Bounds;
var modelCenter = new Point3D(bounds.X + bounds.SizeX / 2,
bounds.Y + bounds.SizeY / 2,
bounds.Z + bounds.SizeZ / 2);
var modelSize = Math.Sqrt(bounds.SizeX * bounds.SizeX +
bounds.SizeY * bounds.SizeY +
bounds.SizeZ * bounds.SizeZ);
Camera1.TargetPosition = modelCenter;
Camera1.Distance = modelSize * 1.5;
}
// If the read model already define some lights, then do not show the Camera's light
if (ModelUtils.HasAnyLight(_wpf3DModel))
{
Camera1.ShowCameraLight = ShowCameraLightType.Never;
}
else
{
Camera1.ShowCameraLight = ShowCameraLightType.Always;
}
}
_isLoading = false;
}
finally
{
Mouse.OverrideCursor = null;
}
},
TaskScheduler.FromCurrentSynchronizationContext()); // Run on UI thread
_isLoading = true;
Mouse.OverrideCursor = Cursors.Wait;
// Start tasks
readObjFileTask.Start();
}