public override void Do(IDemoChartControl chartControl)
{
// Demo volumetric binary data from resources.
byte[] data = Properties.Resources.skull;
// Size of data is the same in all 3 dimensions.
var size = (int)Math.Round(Math.Pow(data.Length, 1d / 3d));
// Link to data. Several rendering techniques can use the same data. For reader we should specify link to binary data, slice size, and value axis bounds.
// For dynamic updates of data you can implement your own reader, basic reader interface provide neccessary methods for updating separate data regions.
// Byte, Short, Float types are supported.
var reader = new ByteIntensityImage3DReader(data, size, size, new OneAxisBounds(data.Min(), data.Max()));
// Geometry specify bounding box to that volume data will be fitted. Geometry can be more complex than just box.
// Mostly it does nothave limits, you can specify even sphere.
var geometry = new BoxVolumeGeometry
{
Origin = Vector3F.Zero,
Size = new Vector3F(1f),
};
// Initialize ray-casting.
var rayCasting = new VolumeRayCasting
{
// Setup it's reader. We'll reuse it for section.
Reader = reader,
// Setup ray-casting geometry.
Geometry = geometry,
// Interpolation type between voxels/
InterpolationType = VolumeInterpolationType.Linear,
// Parameter for ray casting technique that will specify how much steps will be on a each ray.
// Directly effects performance and render quality. By default it is calculated automatically.
SamplingStepCount = size,
// Threshold for transparent areas that will no be visible for hit testing.
// 0 will increase picking performance due to item will be picked by bounding box.
HitTestThreshold = 0.25f,
// The same as HitTestThreshold, but for highlighting.
HighlightThreshold = 0.25f,
// Global value transparency scale.
ValueScale = 0.3f,
// Set name.
Name = "Volume",
// Don't forget to enable depth-test since we want to visualize section in the ray-casting.
IsDepthTestEnabled = true
};
List <RenderData> renderDatas = new List <RenderData>();
void SubmitSection(float relativeLocation, int id)
{
// Initialize volume visual section that takes control over section presentation.
var visualSection = new VolumeVisualPlaneSection
{
// Specify it's parent geometry as ray-casting geometry we want to cross.
ParentGeometry = geometry,
// Setup section plane origin.
Origin = new Vector3F(relativeLocation),
// Setup section plane normal.
Normal = new Vector3F(1, 1, 1),
OutlineThickness = 2.0f,
OutlineColor = Colors.Black,
IsOutlineVisible = true,
FillColor = new Color4(Colors.Blue, 100),
IsFillVisible = false,
Name = $"Visual {id}"
};
renderDatas.Add(visualSection);
// Initialize volume section render data.
var section = new VolumeSection
{
// Setup reader.
Reader = reader,
// Link the section geometry to it's visual section geometry.
Geometry = visualSection.SectionGeometry,
Name = $"Section {id}"
};
renderDatas.Add(section);
}
// Bounding box.
var boundingCube = new Cube
{
Size = new Vector3F(1f),
Position = new Vector3F(0.5f),
Color = Colors.Black,
PresentationType = PrimitivePresentationType.Wireframe,
Name = "Bounds"
};
renderDatas.Add(boundingCube);
// Add sections.
SubmitSection(0.25f, 0);
SubmitSection(0.5f, 1);
SubmitSection(0.75f, 2);
// Place ray-casting as last item to enable depth-test.
renderDatas.Add(rayCasting);
// Decrease multisampling level to improve interaction experience.
chartControl.Multisampling = Multisampling.Low2X;
chartControl.Axes.IsAxes3DVisible = true;
// Set chart data source.
chartControl.DataSource = renderDatas;
}
public override void Do(IDemoChartControl chartControl)
{
// Order-Independent transparency requres additional GPU resources, it should be used only when neccessary.
// Multisample antialiasing and control resolution have significant effect to OIT performance.
chartControl.IsOitEnabled = true;
// Demo volumetric binary data from resources
var data = Properties.Resources.skull;
// Size of data is the same in all 3 dimensions
var size = (int)Math.Round(Math.Pow(data.Length, 1d / 3d));
// Link to data. Several rendering techniques can use the same data. For reader we should specify link to binary data, slice size, and value axis bounds.
// For dynamic updates of data you can implement your own reader, basic reader interface provide neccessary methods for updating separate data regions.
// Byte, Short, Float types are supported. The reader will be used for both ray-casting for efficient memory usage.
var reader = new ByteIntensityImage3DReader(data, size, size, new OneAxisBounds(data.Min(), data.Max()));
// Create volume geometry object (we'll reuse it for both ray-castings for efficient memory usage).
var geometry = new BoxVolumeGeometry
{
Origin = Vector3F.Zero,
Size = new Vector3F(1f)
};
float ComputeRelativeIsoValue(float relativeValue) =>
reader.ValueRange.Min + (reader.ValueRange.Max - reader.ValueRange.Min) * relativeValue;
VolumeIsoRayCasting CreateRayCasting(float relativeLevel, Color4 color, string name)
{
return(new VolumeIsoRayCasting
{
// Set ray-casting data reader.
Reader = reader,
// Set ray-casting border geometry.
Geometry = geometry,
// Set value interpolation type.
InterpolationType = VolumeInterpolationType.Linear,
// Set iso-value.
IsoValue = ComputeRelativeIsoValue(relativeLevel),
// Set surface color.
Color = color,
// Set hit-test threshold value.
HitTestThreshold = 0.25f,
// Set sampling step count.
SamplingStepCount = 500,
// Set name.
Name = name
});
}
// Create first ray-casting.
VolumeIsoRayCasting rayCasting = CreateRayCasting(0.4f, new Color4(Colors.Red, 125), "Volume 1");
// Create second ray-casting.
VolumeIsoRayCasting rayCasting2 = CreateRayCasting(0.15f, new Color4(Colors.White, 125), "Volume 2");
// Create internal cube.
var cube = new Cube
{
Size = new Vector3F(0.5f),
Position = new Vector3F(0.5f),
Color = new Color4(Colors.Green, 150),
Name = "Cube"
};
// Create border cube.
var borderCube = new Cube
{
Size = new Vector3F(1f),
Position = new Vector3F(0.5f),
Color = Colors.Red,
PresentationType = PrimitivePresentationType.Wireframe,
Name = "Bounds"
};
// Decrease multisampling level to improve interaction experience.
chartControl.Multisampling = Multisampling.Low2X;
// Set chart data source.
chartControl.DataSource = new RenderData[] { rayCasting, cube, borderCube, rayCasting2 };
}
