2D volume rendering

[typically]

When colour mapping is updated on a Volume3DInt, 2D rendering updates accordingly. After a pause (~20 s ??), the rendering changes in 2D but not 3D. Transparency appears to be lost. Need to understand:

• Why is this change occurring after 20 sec?
• What is causing the change?

Attached screenshots:

• 2D before
• 2D after
• 3D after

OS: Mac, running Catalina 10.15.6 JDK: 1.8.0_161 (Oasis)

[typically]

Persists with regeneration and section changes. Requires full reapplication of colour map, which then reverts again after 20 s.

[typically]

This is due to a delay on line 2800 of InterfaceVolumePanel.java for a large (0.5mm^3 resolution) volume:

'currentVolume.updateTexture();'

...which updates the texture and repaints the 2D window. The subsequent line (executed after the delay) fires a shapeModified event, resulting in the colour map issue:

currentVolume.fireShapeModified();

Fix:

• Remove call to fireShapeModified on line 2801 of InterfaceVolumePanel.java
• Change line 1497 of Volume3DInt (function updateTexture) from fireChildren2DModified(); to fireShapeModified();

Bug no longer appears. Both 2D and 3D images update properly.

[typically]

Bug reoccurs when new objects are loaded. May be an issue with the WindowedColourModel (cloning?).