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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Jim, you are right, that is not exactly what I wanted. However I confirm you that the original image din NOT have alpha values, I forced it to have alpha. Since you ask, probably the problem lies exactly there :). I will check later on, I didn't want to use the modified Imageadaptor anyway. Regards, Andrea * [A.D. 15/11/06 07:12], Jim Koutsovasilis <J.Koutsovasilis@xxxxxxxxxx> probably wrote: > Hello Andrea, > > not sure about this, but could you try the following: > > > ScalarMap elevationAlphaMap = new ScalarMap(demElevation, Display.Alpha); > > display.addMap(elevationAlphaMap); > > and comment out the lines: > > ScalarMap alphaMap = new ScalarMap(alphaType, Display.Alpha); > > display.addMap(alphaMap) > > This will map elevation to alpha, meaning that the hill tops will be solid, > while the valleys will be transparent (or the other way around...) This is > probably not what you wanted though, as you were using the RGBA values from > the > image to map the A component of RGBA to Display.Alpha. > > Can you confirm that the original image has alpha values in it? I don't know > what visad does if you give it an RGB image, but then treat the range as RGBA. > > (Don't think this is much help) > > Regards, > Jim. > > > > -----Original Message----- > From: Andrea Antonello [mailto:andrea.antonello@xxxxxxxxx] > Sent: Tue 14/11/2006 8:29 PM > To: Jim Koutsovasilis > Cc: visad@xxxxxxxxxxxxxxxx > Subject: Re: RE: ogc features over orthophoto over dem > > > Thanks Jim, > the alpha sucks a lot of additional ram, so I switched it off. > Good you asked, since something very strange happens when using alpha: > http://www.jgrass.org/cgi-bin/moin.cgi/HowItIsGoingWithVisad?action=show > > The photo behaves like having alpha on itself (you can see the > overlays), but it doesn't. You can see the axes, but not the map below. > > I also tried to do the alpha with a ConstantMap[], but I went out of > memory with 2 gigs of dedicated ram. And that on a raster of about > 200x200. This hurts. > > Any idea about the transparency problem? > > Andrea > > > > > > > * [A.D. 14/11/06 09:49], Jim Koutsovasilis <J.Koutsovasilis@xxxxxxxxxx> > probably wrote: > > Hello Andrea, > > > > your screenshot is very impressive and inspiring. > > > > Most of your Display.Alpha code is commented out - I am wondering how > > the screenshot would have looked with transparency turned on. > > > > Regards, > > Jim. > > --- > > Jim Koutsovasilis > > CSSB / Communications / AMDISS > > Australian Bureau of Meteorology > > > > Phone: +61 3 9669 4303 > > Email: jimk@xxxxxxxxxx > > > > > > -----Original Message----- > > From: owner-visad@xxxxxxxxxxxxxxxx [mailto:owner-visad@xxxxxxxxxxxxxxxx] > > On Behalf Of Andrea Antonello > > Sent: Tuesday, 14 November 2006 05:28 > > To: visad@xxxxxxxxxxxxxxxx > > Subject: ogc features over orthophoto over dem > > > > > > > > I prototyped around a little bit adding also shapefiles to my testcase > > and I must say: visad rocks! > > > > I have huge performance problems, which I hope to resolve somehow later. > > > > I put the resulting screenshot at: > > http://www.jgrass.org/cgi-bin/moin.cgi/HowItIsGoingWithVisad?action=show > > I hope someone is interested in this first draft and has some ideas on > > how to do things better. I welcome all critics (Don Murray, I wasn't yet > > able to get things work following your advices, I will come back on that > > later). > > > > I have a couple of rather different questions I would like to post, in > > the hope they are not too scattered. > > > > - in visad, is there some kind of caching system that gives the > > possibility to work with huge files that can't be kept in memory? Kind > > of tiling mechanism. LIDAR and friends are a now used reality, has > > anyone experience? > > > > - in the image I made the river with a Gridded3DSet. I'm not sure if > > that is the proper way. Should I use some VisadLineArray? > > > > - also, I had to elevate the river of some meter, since in certain parts > > it went below the elevation model (which by the way is right, since the > > river is made of coarser points as the dem and the lines in some parts > > "intersect" the dem). Has anyone a better idea to overlay the shapefile > > over the dem? > > > > - I tried to simulate a line with borders by painting a thinner after a > > thicker one of different color. The result is weak as expected, is there > > any way to do styling of lines (apart of dashing, which I read is > > supported)? > > > > And last but not least (even if really not so important :)): > > - has anyone an idea about how to put a filled polygon over the dem? I > > tried as a joke to do it with Delauny, but it doesn't permit 3D. > > Perhaps the best would be to create an image and use it as a texture > > over the dem and photo (does this last sentence make a sense?). > > > > > > Thanks in advance for any comment. > > Andrea > > > > ======================================================================= > > ====== > > To unsubscribe visad, visit: > > http://www.unidata.ucar.edu/mailing-list-delete-form.html > > ======================================================================= > > ====== > > > > -- > ____________________________________________________________________________ > HydroloGIS - Environmental Safety Modelling > Siemens Str. 19 via Siemens > I-39100 Bozen - Bolzano > www.hydrologis.com > > Andrea Antonello > Environmental Engineer > tel. +39 0471 068065 > mobile: +39 328 8497722 > fax: +39 36 328 8497722 > email: andrea.antonello@xxxxxxxxxxxxxx > > "Let it be as much a great honour to take as to give learning, > if you want to be called wise." > Skuggsja' - The King's mirror - 1240 Reykjavik > ____________________________________________________________________________ > > -- ____________________________________________________________________________ HydroloGIS - Environmental Safety Modelling Siemens Str. 19 via Siemens I-39100 Bozen - Bolzano www.hydrologis.com Andrea Antonello Environmental Engineer tel. +39 0471 068065 mobile: +39 328 8497722 fax: +39 36 328 8497722 email: andrea.antonello@xxxxxxxxxxxxxx "Let it be as much a great honour to take as to give learning, if you want to be called wise." Skuggsja' - The King's mirror - 1240 Reykjavik ____________________________________________________________________________ ============================================================================== To unsubscribe visad, visit: http://www.unidata.ucar.edu/mailing-list-delete-form.html ==============================================================================
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