Hi I have two datasets, one is 350x700 another is 900x1500. I use the alomost same VisAD code to display them in Lat-Lon 2D domain, except the length of data samples is different, display = new DisplayImplJ3D("display", new TwoDDisplayRendererJ3D()); latMap = new ScalarMap(RealType.Latitude, Display.YAxis); lonMap = new ScalarMap(RealType.Longitude, Display.XAxis); display.addMap(latMap); display.addMap(lonMap); imageValue = RealType.getRealType("image"); rgbMap = new ScalarMap(imageValue, Display.RGB); display.addMap(rgbMap); imageRef = new DataReferenceImpl("image"); display.addReference(imageRef); ......... I could get a color display for dataset with less data samples but a grey display for the large dataset. The interest thing is: when I click on the display (since PointManipulationRendererJ3D has been added to the above display), I could get the correct lat, lon and data value at the point I have clicked. Does anyone know why I end up with a grey display for the larger dataset? By the way, I am on SGI IRIX with 2 600 MHZ IP30 Processors CPU: MIPS R14000 Processor Chip Revision: 2.4 FPU: MIPS R10010 Floating Point Chip Revision: 0.0 Main memory size: 1536 Mbytes java version "1.3.1" Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-mtibuild-011130-22:40) Classic VM (build 1.3.1-mtibuild-011130-22:40, native threads, mipsjit) Java 3D 1.2.1 from SGI Thanks for your great help.