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.
reader = new ByteIntensityImage3DReader(data, size, size, new OneAxisBounds(data.Min(), data.Max()));
// Initialization of rendering technique.
var rayCasting = new VolumeIsoRayCasting
{
// 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 datayou can implement your own reader, basic reader interface provide neccessary methods for updating separate data regions.
Reader = reader,
// 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.
Geometry = new BoxVolumeGeometry
{
Origin = Vector3F.Zero,
Size = new Vector3F(1f),
},
// 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,
// Interpolation type between voxels.
InterpolationType = VolumeInterpolationType.Linear,
// Property that define value level for isosurface.
IsoValue = reader.ValueRange.Min + (reader.ValueRange.Max - reader.ValueRange.Min) * 0.5f,
// Specify iso-surface color.
Color = new Color4(Colors.Red, 125),
// For isosurface there is no difference which value is setted. Only 0 or another from 0 have sence.
// 0 will increase picking performance due to item will be picked by bounding box.
HitTestThreshold = 0.25f,
// Set name.
Name = "Volume"
};
// Bounding box.
var cube = 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;
// Setup chart data source.
chartControl.DataSource = new RenderData[] { rayCasting, cube };
// Start animation.
animationHelper.Start(
(argument) =>
{
if (argument > reader.ValueRange.Max)
{
argument = reader.ValueRange.Min;
}
return(argument);
},
(argument) => { rayCasting.IsoValue = argument; }, reader.ValueRange.Min, 2f, 40);
}
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 };
}