private void SetupOutlineRenderingStep()
{
_solidColorEffectWithOutline = new SolidColorEffect();
_solidColorEffectWithOutline.Color = Colors.Orange.ToColor4();
_solidColorEffectWithOutline.OverrideModelColor = true;
_solidColorEffectWithOutline.OutlineThickness = 0;
_solidColorEffectWithOutline.WriteMaxDepthValue = false;
_solidColorEffectWithOutline.InitializeResources(MainDXViewportView.DXScene.DXDevice);
_disposables.Add(_solidColorEffectWithOutline);
_backgroundColor = new Color4(1, 1, 1, 0);
var stencilSetToOneDescription = new DepthStencilStateDescription()
{
IsDepthEnabled = true,
DepthWriteMask = DepthWriteMask.All,
DepthComparison = Comparison.LessEqual,
IsStencilEnabled = true,
StencilReadMask = 0xFF,
StencilWriteMask = 0xFF,
FrontFace =
{
Comparison = Comparison.Always,
DepthFailOperation = StencilOperation.Keep,
FailOperation = StencilOperation.Keep,
PassOperation = StencilOperation.Replace // The value that is set as reference is set in the ContextStateManger when _deviceContext.OutputMerger.SetDepthStencilState is called - the value is set to 1.
}
};
stencilSetToOneDescription.BackFace = stencilSetToOneDescription.FrontFace;
_stencilSetToOneDepthStencilState = new DepthStencilState(MainDXViewportView.DXScene.Device, stencilSetToOneDescription);
if (MainDXViewportView.DXScene.DXDevice.IsDebugDevice)
{
_stencilSetToOneDepthStencilState.DebugName = "StencilSetToOneDepthStencilState";
}
_disposables.Add(_stencilSetToOneDepthStencilState);
var renderWhenStencilIsNotOneDescription = new DepthStencilStateDescription()
{
IsDepthEnabled = true,
DepthWriteMask = DepthWriteMask.All,
DepthComparison = Comparison.LessEqual,
IsStencilEnabled = true,
StencilReadMask = 0xFF,
StencilWriteMask = 0xFF,
FrontFace =
{
Comparison = Comparison.Greater, // render only when 1 is greater then stencil value
DepthFailOperation = StencilOperation.Keep,
FailOperation = StencilOperation.Keep,
PassOperation = StencilOperation.Keep
}
};
renderWhenStencilIsNotOneDescription.BackFace = stencilSetToOneDescription.FrontFace;
_renderWhenStencilIsNotOneState = new DepthStencilState(MainDXViewportView.DXScene.Device, renderWhenStencilIsNotOneDescription);
if (MainDXViewportView.DXScene.DXDevice.IsDebugDevice)
{
_renderWhenStencilIsNotOneState.DebugName = "RenderWhenStencilIsNotOneState";
}
_disposables.Add(_renderWhenStencilIsNotOneState);
var renderingStepsGroup = new RenderingStepsGroup("Render outline group", MainDXViewportView.DXScene.RenderingSteps);
renderingStepsGroup.BeforeRunningStep += (object sender, DirectX.RenderingEventArgs args) =>
{
var renderingContext = args.RenderingContext;
// Set new back buffer where we will render outline objects
SetupOutlineBackBuffers(renderingContext);
// Set new DepthStencilState that will also set stencil value to 1 for each rendered pixel
renderingContext.ContextStatesManager.DepthStencilState = _stencilSetToOneDepthStencilState;
_addOutlineRenderingStep.SourceTexture = _outlineShaderResourceView;
};
renderingStepsGroup.AfterRunningStep += (object sender, DirectX.RenderingEventArgs args) =>
{
var renderingContext = args.RenderingContext;
// Reset the saved back buffer
RestoreBackBuffers(renderingContext);
};
// The first step in rendering outlines is to render selected objects with the selected solid color.
// This is done with creating a custom RenderObjectsRenderingStep
// and overriding the OverrideEffect to use SolidColorEffect and _stencilSetToOneDepthStencilState.
// We also render only the selected objects - this is done with using FilterObjectsFunction.
var renderOutlinesObjectsRenderingStep = new RenderObjectsRenderingStep("Render outlined objects")
{
OverrideEffect = _solidColorEffectWithOutline,
OverrideDepthStencilState = _stencilSetToOneDepthStencilState,
FilterObjectsFunction = delegate(RenderablePrimitiveBase objectToRender)
{
// IMPORTANT:
// This delegate is highly performance critical because it is called for each object in each frame.
// Therefore do not access any WPF's DependencyProperties there.
var wpfGeometryModel3DNode = objectToRender.OriginalObject as WpfGeometryModel3DNode;
if (wpfGeometryModel3DNode == null)
{
return(false);
}
// NOTE:
// Here we do a simple check for object name in a List<string>.
// If you have a lot of selected objects, use HashSet<string> instead.
//
// The reason why the check is done by the object name is that this way
// we can simply connect the WPF object (that is selected) and the SceneNode object that is created from the WPF object.
// So if we define the name for the WPF objects, then the SceneNode objects that are created from them will also have the same name.
//
// But if it is not possible to name WPF objects of if you have duplicate names,
// then you will need to store SceneNode objects in HashSet instead of object names.
//
// To use this we need to get the SceneNode instances that are created from WPF objects.
// One option is to call MainDXViewportView.GetSceneNodeForWpfObject(wpfObject) for each WPF object (this must be called after the SceneNodes are initialized - for example in DXSceneInitialized).
// Another option is to wait until SceneNodes are created from WPF objects (in DXSceneInitialized event handler or if the scene was already created after calling MainDXViewportView.Update()).
// Then go through all SceneNodes in the hierarchy (you can use MainDXViewportView.DXScene.RootNode.ForEachChildNode method)
// and for each WpfGeometryModel3DNode gets its GeometryModel3D and build a Dictionary with WPF (GeometryModel3D) and SceneNode (WpfGeometryModel3DNode) objects.
// Then when you select for which WPF objects you want to draw outline, create a HashSet<WpfGeometryModel3DNode> with list of WpfGeometryModel3DNode objects.
return(_selectedObjectNames.Contains(wpfGeometryModel3DNode.Name));
}
};
renderingStepsGroup.Children.Add(renderOutlinesObjectsRenderingStep);
// Add two ExpandPostProcess that will make the outline bigger
int outlineWidth = (int)OutlineSizeSlider.Value;
_horizontalExpandPostProcess = new Ab3d.DirectX.PostProcessing.ExpandPostProcess(isVerticalRenderingPass: false, expansionWidth: outlineWidth, backgroundColor: _backgroundColor);
_verticalExpandPostProcess = new Ab3d.DirectX.PostProcessing.ExpandPostProcess(isVerticalRenderingPass: true, expansionWidth: outlineWidth, backgroundColor: _backgroundColor);
_disposables.Add(_horizontalExpandPostProcess);
_disposables.Add(_verticalExpandPostProcess);
var expandPostProcesses = new List <PostProcessBase>();
expandPostProcesses.Add(_horizontalExpandPostProcess);
expandPostProcesses.Add(_verticalExpandPostProcess);
// We could also blur the outline to make it bigger, but Expand creates better results
//var horizontalBlurPostProcess = new Ab3d.DirectX.PostProcessing.SimpleBlurPostProcess(isVerticalBlur: false, filterWidth: 5);
//var verticalBlurPostProcess = new Ab3d.DirectX.PostProcessing.SimpleBlurPostProcess(isVerticalBlur: true, filterWidth: 5);
//horizontalBlurPostProcess.InitializeResources(MainDXViewportView.DXScene.DXDevice);
//verticalBlurPostProcess.InitializeResources(MainDXViewportView.DXScene.DXDevice);
//blurPostProcesses.Add(horizontalBlurPostProcess);
//blurPostProcesses.Add(verticalBlurPostProcess);
_expandObjectsPostProcessesRenderingSteps = new RenderPostProcessingRenderingStep("Expand objects rendering step", expandPostProcesses);
renderingStepsGroup.Children.Add(_expandObjectsPostProcessesRenderingSteps);
MainDXViewportView.DXScene.RenderingSteps.AddAfter(MainDXViewportView.DXScene.DefaultInitializeRenderingStep, renderingStepsGroup);
_addOutlineRenderingStep = new RenderTextureRenderingStep(RenderTextureRenderingStep.TextureChannelsCount.FourChannels, "Render outline over 3D scene")
{
Offsets = new Vector4(0, 0, 0, 0), // preserve original colors
Factors = new Vector4(1, 1, 1, 1),
TargetViewport = new ViewportF(0, 0, 1f, 1f), // render to full screen
CustomBlendState = MainDXViewportView.DXScene.DXDevice.CommonStates.NonPremultipliedAlphaBlend, // alpha blend
CustomDepthStencilState = _renderWhenStencilIsNotOneState, // only render when stencil value is less then 1 (not where the objects are rendered)
};
_addOutlineRenderingStep.BeforeRunningStep += delegate(object sender, DirectX.RenderingEventArgs args)
{
var renderingContext = args.RenderingContext;
renderingContext.SetBackBuffer(renderingContext.CurrentBackBuffer, renderingContext.CurrentBackBufferDescription, renderingContext.CurrentRenderTargetView, _outlineDepthStencilView, false);
//renderingContext.DeviceContext.OutputMerger.SetTargets(_outlineDepthStencilView, renderingContext.CurrentRenderTargetView);
};
MainDXViewportView.DXScene.RenderingSteps.AddBefore(MainDXViewportView.DXScene.DefaultCompleteRenderingStep, _addOutlineRenderingStep);
}
private void SetupExpandPostProcessOutlines()
{
var dxScene = MainDXViewportView.DXScene;
_blackOutlineEffect = EnsureSolidColorEffect();
if (_blackOutlineEffect == null)
{
return;
}
// Reset values that may be changed when using SolidColorEffectWithOutlines
_blackOutlineEffect.DepthBias = 0;
_blackOutlineEffect.OverrideRasterizerState = null;
_blackOutlineEffect.OutlineThickness = 0;
_blackOutlineEffect.WriteMaxDepthValue = true;
_renderObjectOutlinesRenderingStep = EnsureRenderObjectsRenderingStep(dxScene);
if (!dxScene.RenderingSteps.Contains(_renderObjectOutlinesRenderingStep))
{
dxScene.RenderingSteps.AddBefore(dxScene.DefaultRenderObjectsRenderingStep, _renderObjectOutlinesRenderingStep);
}
int outlineWidth = (int)OutlineWidthComboBox.SelectedItem;
if (_prepareExpandObjectsPostProcessingRenderingStep == null)
{
// Expand post process is done in two passes (one horizontal and one vertical)
_horizontalExpandPostProcess = new Ab3d.DirectX.PostProcessing.ExpandPostProcess(isVerticalRenderingPass: false, expansionWidth: outlineWidth, backgroundColor: dxScene.BackgroundColor);
_verticalExpandPostProcess = new Ab3d.DirectX.PostProcessing.ExpandPostProcess(isVerticalRenderingPass: true, expansionWidth: outlineWidth, backgroundColor: dxScene.BackgroundColor);
_disposables.Add(_horizontalExpandPostProcess);
_disposables.Add(_verticalExpandPostProcess);
var expandPostProcesses = new PostProcessBase[]
{
_horizontalExpandPostProcess,
_verticalExpandPostProcess
};
// To execute the post processes we need to rendering steps:
// 1) PreparePostProcessingRenderingStep that creates required RenderTargets and ShaderResourceViews and sets that to the RenderPostProcessingRenderingStep
// 2) RenderPostProcessingRenderingStep that actually executed all the post-processes
// Because we will execute post-processes before the standard scene rendering,
// we also need to make sure that the Destination buffer is correctly set (see _prepareExandObjectsPostProcessingRenderingStep.BeforeRunningStep)
// and that the DepthStencilView is reset after the post-processes are rendered (see _expandObjectsPostProcessesRenderingSteps.AfterRunningStep).
// First create the RenderPostProcessingRenderingStep because it is needed in the constructor of the PreparePostProcessingRenderingStep
_expandObjectsPostProcessesRenderingSteps = new RenderPostProcessingRenderingStep("Expand objects rendering step", expandPostProcesses);
_expandObjectsPostProcessesRenderingSteps.AfterRunningStep += delegate(object sender, RenderingEventArgs args)
{
// Post-processes are usually executed at the end of rendering process and work on 2D textures so they do not require DepthStencil.
// The CurrentBackBuffer / Description and RenderTargetView are already correct because they are sent by PreparePostProcessingRenderingStep,
// but we need to set the _savedDepthStencilView and SupersamplingCount.
args.RenderingContext.SetBackBuffer(args.RenderingContext.CurrentBackBuffer,
args.RenderingContext.CurrentBackBufferDescription,
args.RenderingContext.CurrentRenderTargetView,
_savedDepthStencilView,
dxScene.SupersamplingCount,
bindNewRenderTargetsToDeviceContext: true);
};
_disposables.Add(_expandObjectsPostProcessesRenderingSteps);
_prepareExpandObjectsPostProcessingRenderingStep = new PreparePostProcessingRenderingStep(_expandObjectsPostProcessesRenderingSteps, "Prepare expand post process");
_prepareExpandObjectsPostProcessingRenderingStep.BeforeRunningStep += delegate(object sender, RenderingEventArgs args)
{
// Because after the post-processes are executed we will continue with rendering the scene,
// we need to set the DestinationBackBuffer (there will be the final result of the post-processes)
// to the currently used BackBuffer. If this is not done, then RenderingContext.FinalBackBuffer is used as destination back buffer.
_prepareExpandObjectsPostProcessingRenderingStep.SetCustomDestinationBackBuffer(args.RenderingContext.CurrentBackBuffer,
args.RenderingContext.CurrentBackBufferDescription,
args.RenderingContext.CurrentRenderTargetView);
// Save CurrentDepthStencilView
_savedDepthStencilView = args.RenderingContext.CurrentDepthStencilView;
};
_disposables.Add(_prepareExpandObjectsPostProcessingRenderingStep);
}
else
{
_horizontalExpandPostProcess.ExpansionWidth = outlineWidth;
_verticalExpandPostProcess.ExpansionWidth = outlineWidth;
}
if (!dxScene.RenderingSteps.Contains(_prepareExpandObjectsPostProcessingRenderingStep))
{
dxScene.RenderingSteps.AddAfter(_renderObjectOutlinesRenderingStep, _prepareExpandObjectsPostProcessingRenderingStep);
dxScene.RenderingSteps.AddAfter(_prepareExpandObjectsPostProcessingRenderingStep, _expandObjectsPostProcessesRenderingSteps);
}
}