#3600: m.nviz.image doesn't produce any output
--------------------------+-------------------------
Reporter: guano | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone:
Component: Default | Version: 7.0.4
Resolution: | Keywords:
CPU: Unspecified | Platform: MacOSX
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Comment (by hellik):
Replying to [comment:54 hcho]:
> Only Windows defines double buffering; that's why Linux works without
buffer swapping because it has only one buffer. BUT, glGetError() still
returns GL_INVALID_OPERATION according to https://www.khronos.org/registry
/OpenGL-Refpages/gl4/html/glReadBuffer.xhtml. Probably, that's why some
Linux drivers and MacOS don't work at all.
>
> Windows is also broken because nviz draws to the back buffer, but it
reads from the front buffer without buffer swapping.
tested with
{{{
GRASS version: 7.5.svn
GRASS SVN revision: r72969
Build date: 2018-07-10
Build platform: x86_64-w64-mingw32
GDAL: 2.2.4
PROJ.4: 4.9.3
GEOS: 3.5.0
SQLite: 3.17.0
Python: 2.7.14
wxPython: 2.8.12.1
Platform: Windows-10-10.0.17134 (OSGeo4W)
}}}
{{{
C:\>m.nviz.image elevation_map=elevation output=D:\temp\mnviz\elev
perspective=15
Loading raster map <elevation@PERMANENT>...
100%
Loading raster map <elevation@PERMANENT>...
100%
Translating colors from raster map <elevation@PERMANENT>...
100%
WARNING: Unable to get image of current GL screen
ERROR: Failed to write image
}}}
{{{
C:\>m.nviz.image elevation_map=elevation output=D:\temp\mnviz\elev
perspective=15 format=tif
Loading raster map <elevation@PERMANENT>...
100%
Loading raster map <elevation@PERMANENT>...
100%
Translating colors from raster map <elevation@PERMANENT>...
100%
WARNING: Unable to get image of current GL screen
ERROR: Failed to write image
}}}
--
Ticket URL: <https://trac.osgeo.org/grass/ticket/3600#comment:58>
GRASS GIS <https://grass.osgeo.org>
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