Hi Aurora, With his proposition, you can create the color that you need. Setcolor(vec4) uses RGBA (Red, Green, Blue, Alpha) color (if i remember well) so put A to 1.0 (opacity) , and the RGB can be defined using the function he gives to you... you can use it for each component if you want a greyscale color (R=G=B) or only use it on one component... try it and you will see...
for greyscale image, you can try : hightcolor = 1.0 lowcolor = 0.0 and then R =(highColor - lowColor) * ((altitude - minAltitude) / maxAltitude) + lowColor; G =(highColor - lowColor) * ((altitude - minAltitude) / maxAltitude) + lowColor; B =(highColor - lowColor) * ((altitude - minAltitude) / maxAltitude) + lowColor; this is just a simple example... Regards, Vincent. 2008/2/29, aurora restivo <[EMAIL PROTECTED]>: > > The Sukender ha scritto: > > Hum... I don't have a global solution, but you may set a color for each > vertex with something lile : > color = (highColor - lowColor) * ((altitude - minAltitude) / maxAltitude) + > lowColor; > > > > > I apologize but I am still inexperienced. > > I have a HeightField associated to shapeDrawable (this because if I use > Locator and GeometryTechnique I succeed in visualizing the alone ground > "GEOCENTRIC"), > therefore if I use > > shapeDrawable - > setColor (Vec4); > > I don't know whether to plan the values of the Vec4 with the formula that > you have sent me > > besides of what type it is color? > > Aurora > > > > You can allso do it in HSL coordinates (instead of RGB). > > Sukender > > ---------------------------------------- > > Date: Fri, 29 Feb 2008 12:54:48 +0100 > From: [EMAIL PROTECTED] > To: [email protected] > Subject: Re: [osg-users] [Fwd: Re: to draw landscapes beginning from a > matrix] > > Hi! > > does a way exists to color from the tallest altitude of a ground to the > lowest with gradations of color? > > thanks > Aurora > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _________________________________________________________________ > Votre contact a choisi Hotmail, l'e-mail nouvelle génération. Créez un compte. > http://www.windowslive.fr/hotmail/default.asp > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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