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Is it possible to render a model in isometric view ?
"rt" command can only make perspective view ?
Actually, rt's default is isometric. You have to specifically enable perspective (and can control the angle). On the command line, the -p## option enables perspective. Within MGED or Archer, perspective mode can be disabled on the menu or via "set perspective -1".
Another question. How can I know the ratio between the model real measurement and the pixel dimensions of the rt / rtedge isometric view ?
I'd like to quote the isometric view.
At the beginning of every rt/rtedge rendering is a header of information displayed. Included is all of the details on the view:
$ rt -o/dev/null share/brlcad/7.21.0/db/moss.g all.g
BRL-CAD Release 7.21.0 The BRL-CAD Raytracer RT
Tue, 01 May 2012 10:13:30 -0700, Compilation 9
Tree: 6 solids in 6 regions
Model: X(-50, 90), Y(-70, 70), Z(-24, 63)
View: 35 azimuth, 25 elevation off of front view
Orientation: 0.248097, 0.476591, 0.748097, 0.389435
Eye_pos: 133.511, 79.4814, 84.117
Grid: (0.422386, 0.422386) mm, (512, 512) pixels
Beam: radius=0.211193 mm, divergence=0 mm/1mm
Output file is '/dev/null' 512x512 pixels
For an isometric view, I have the dimensions of a single pixel (0.422386mm x 0.422386mm) and of the whole view (216.261mm x 216.261mm).