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Volume Color Map Editor Panel |
In this panel you can edit the color map that is used for rendering volumes.
To open the Volume Color Map Editor panel, you can:
Click Volume Editor in the Manage Surfaces panel.
The color map editor enables you to define the opacity assigned to different values of a volume (a property that is a function of the three spatial coordinates, such as the electrostatic potential of a molecule). The opacity, and the color values can be defined as a continuous function of the property values. One common use is to define peaks in opacity at certain values of the property.
The opacity and color are set up in a graphical manner, by adding points at particular values of the property and the opacity, and with a particular color value. These points can be dragged around to change the shape of the opacity curve. The color is interpolated linearly between points, and the logarithm of the opacity is interpolated linearly between points. You can also define "peaks" which consist of a point at some opacity and property value, and two points on either side at zero opacity. Peaks can be moved and their width changed.
The basic actions for defining the points are as follows:
For detailed control, you can use the Active color point section to change the data value, the opacity, and the color for the current point.
The name of the volume and basic instructions are given at the top of the panel.
Chart of the opacity as a function of the property (data) value. This chart is used to define points of a particular opacity and color at a particular data value. The actions you can use are displayed above the chart, and are described above in the Using section.
If the application that generated the volume provides information on suggested display values, these are used to set the default opacity function.
These text boxes define the maximum and minimum values of the property used for volume rendering. Initially they are set to the maximum and minimum available values of the property.
Reset the values in the endpoint text boxes to the minimum and maximum available values of the property.
Increase the number of "slices" used to render the volumes. This provides a smoother display, but takes longer to generate.
Use the logarithm of the data values rather than the values themselves. The data values should all have the same sign. This option is useful if the data values span many orders of magnitude, and the details of interest occur at different orders. An example is the electron density.
Display the sides of the box in which the volume is defined in the Workspace.
Assign the opacity curve and colors from information contained in the volume file. This button has no effect if the information is not present.
This section displays the data (property) value, opacity, and color of the selected point on the chart. You can edit these three attributes in this section.
Data value of the current point. You can edit the value in this text box to change the property value for the point (horizontal position of the point on the chart).
Opacity value of the current point. You can edit the value in this text box to change the opacity (vertical position of the point on the chart)
Click this button to change the color of the selected point. Opens a standard color chooser. You can also double-click on the point to open the color selector. The color is displayed next to the button.
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