render_volume#

crispy.visualize.render_volume(cube, savename=None, showfig=False, vmin=None, vmax=None, surface_count=16, opacity=None, colorscale='YlGnBu', z_stretch=1, showscale=True, fig=None, val_fill=0.0, cbar_label='')[source]#

Render a 3D volume using layers of isosurfaces.

This function creates a 3D interactive volume rendering visualization of a 3D data cube by plotting multiple isosurfaces at specified value intervals.

Parameters:

  • cube (numpy.ndarray or str) – A 3D numpy array of float values or a file path to a FITS file. If the input is a file path, the data will be loaded and used. NaN values are replaced with val_fill before rendering.

  • savename (str, optional) – Path to save the interactive HTML file. If None, the figure is not saved. Default is None.

  • showfig (bool, optional) – Whether to display the figure interactively. Default is False.

  • vmin (float, optional) – Minimum isosurface value. If None, the 10-sigma level above the estimated RMS is used. Default is None.

  • vmax (float, optional) – Maximum isosurface value. If None, the 99.99th percentile of the data is used. Default is None.

  • surface_count (int, optional) – Number of isosurfaces to plot. Higher values create finer visualization but increase rendering cost. Default is 21.

  • opacity (float, optional) – Opacity of the isosurfaces. If None, it is set to 2 / surface_count for semi-transparency. Default is None.

  • colorscale (str, optional) – Colormap for the isosurfaces. Uses Plotly-compatible colormap names. Default is “YlGnBu”.

  • z_stretch (float, optional) – Scaling factor for the Z-axis to modify aspect ratio. Default is 1.

  • showscale (bool, optional) – Whether to display the color scale bar. Default is True.

  • fig (plotly.graph_objects.Figure, optional) – Existing Plotly figure to add the volume rendering to. If None, a new figure is created. Default is None.

  • val_fill (float, optional) – Value to replace NaN voxels in the cube. Default is 0.0.

  • cbar_label (str, optional) – Label for the colorbar. Default is an empty string.

Returns:

The Plotly figure object containing the 3D volume rendering.

Return type:

plotly.graph_objects.Figure

Notes

  • NaN values in the cube are replaced with val_fill before visualization.

  • Isosurface values range between vmin and vmax, divided into surface_count levels.

  • The visualization requires non-NaN input data for accurate results.

Examples

>>> import numpy as np
>>> X, Y, Z = np.mgrid[-1:1:30j, -1:1:30j, -1:1:30j]
>>> cube = np.sin(np.pi * X) * np.cos(np.pi * Z) * np.sin(np.pi * Y)
>>> render_volume(cube, showfig=True, surface_count=10)
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