How to work with volume renderings
You can download example source code for this HowTo here.
Before reading this HowTo, it may be helpful to read The relation between Content and Universe.
It is possible to edit a volume rendering.
VoltexGroup provides a method
fillRoi(), which takes as input parameters a ROI and a fill value. The ROI (in canvas coordinates) is projected onto the volume, and the covered part of the volume is filled with the specified fill value.
fillRoi() is a method which only applies to volume renderings (orthoslices being an exception), this method is not located in Content.java, but in VoltexGroup.java.
VoltexGroup is a subclass of
ContentNode, and can be retrieved from a
Content (one which is displayed as a volume rendering) with
// Add the image as a volume Content c = univ.addVoltex(imp); // Retrieve the VoltexGroup VoltexGroup voltex = (VoltexGroup)c.getContent(); // Define a ROI Roi roi = new OvalRoi(240, 220, 70, 50); // Define a fill color byte fillValue = (byte)100; // Fill the part of the volume which results from the // projection of the polygon onto the volume: voltex.fillRoi(univ.getCanvas(), roi, fillValue);
One thing worth to keep in mind is that also the original image is changed, and can in this form be saved, if desired.