ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping.Voxel Namespace / IsosurfaceDefinition Class / Value Property
Example

In This Topic
    Value Property (IsosurfaceDefinition)
    In This Topic
    Gets and sets the isosurface value.
    Syntax
    public Nullable<double> Value {get; set;}
    Public Property Value As Nullable(Of Double)
    Remarks
    The value can be null
    Example
    Create Isosurface
    //var voxelLayer = ... ;
    //Must be on the QueuedTask.Run()
    
    //Visualization must be surface
    if (voxelLayer.Visualization != VoxelVisualization.Surface)
        voxelLayer.SetVisualization(VoxelVisualization.Surface);
    
    //Get the variable profile on which to create the iso surface
    var variable = voxelLayer.SelectedVariableProfile;
    
    // o Visualization must be Surface
    // o Variable profile must be continuous
    // o Variable MaxNumberofIsoSurfaces must not have been reached...
    if (variable.CanCreateIsosurface)
    {
        //Note: calling create if variable.CanCreateIsosurface == false
        //will trigger an InvalidOperationException
    
        //Specify a voxel value for the iso surface
        //At 2.x - 
        //var min = variable.GetVariableStatistics().MinimumValue;
        //var max = variable.GetVariableStatistics().MaximumValue;
    
        var min = variable.Statistics.MinimumValue;
        var max = variable.Statistics.MaximumValue;
        var mid = (max + min) / 2;
    
        //color range (i.e. values that are being rendered)
        var renderer = variable.Renderer as CIMVoxelStretchRenderer;
        var color_min = renderer.ColorRangeMin;
        var color_max = renderer.ColorRangeMax;
    
        //keep the surface within the current color range (or it
        //won't render)
        if (mid < color_min)
        {
            mid = renderer.ColorRangeMin;
        }
        else if (mid > color_max)
        {
            mid = renderer.ColorRangeMax;
        }
    
        //Create the iso surface
        var suffix = Math.Truncate(mid * 100) / 100;
        variable.CreateIsosurface(new IsosurfaceDefinition()
        {
            Name = $"Surface {suffix}",
            Value = mid,
            IsVisible = true
        });
    }
    
    How to Change Value and Color on an Isosurface
    //var voxelLayer = ... ;
    //Must be on the QueuedTask.Run()
    
    var variable = voxelLayer.SelectedVariableProfile;
    
    //Change the color of the first surface for the given profile
    var surface = variable.GetIsosurfaces().FirstOrDefault();
    if (surface != null)
    {
        if (voxelLayer.Visualization != VoxelVisualization.Surface)
            voxelLayer.SetVisualization(VoxelVisualization.Surface);
    
        //Change the iso surface voxel value
        surface.Value = surface.Value * 0.9;
    
        //get a random color
        var count = new Random().Next(0, 100);
        var colors = ColorFactory.Instance.GenerateColorsFromColorRamp(
            ((CIMVoxelStretchRenderer)variable.Renderer).ColorRamp, count);
    
        var idx = new Random().Next(0, count - 1);
        surface.Color = colors[idx];
        //set the custom color flag true to lock the color
        //locking the color prevents it from being changed if the
        //renderer color range or color theme is updated
        surface.IsCustomColor = true;
    
        //update the surface
        variable.UpdateIsosurface(surface);
    }
    
    Requirements

    Target Platforms: Windows 11, Windows 10, Windows 8.1

    See Also