Re: [geomview-users] Geomview OpenGL rendering on sgi irix

[<llo...@ya...>]

Claus,

I doubt it's an endianness problem, as at that point
things would be much more wrong.

SaVi's vector map wireframe is drawn above (outside) the
Earth sphere and surface/coverage texturemap, once I
realised I could do that for better results than a
pixelated continents map within the texturemap itself.
It just happens to be a good check that texturemap
rendering is done right and lines up properly, exposing
this bug, which would be slightly less obvious otherwise.

(Understanding d3.js and its mapping to generate better
maps and masks for SaVi is long on my todo list.)

I would quite like to draw a slightly translucent
coverage texturemap sphere around an inner solid
Earth rendering, but since texturemapping doesn't (yet?)
support translucency, I can't see that happening. (SaVi's
coverage map did support an unused alpha channel, way back
when - that was just wasting memory.)

Possibly related: bugs in X rendering (or geomview?) in
e.g. the SaVi logo in the camera viewport being drawn
upside down on Solaris as opposed to the Irix in use
at the Geometry Center, and the original SaVi tested
for specific geomview versions to display an inverted SaVi
logo that looked right. See buggy_geomview code in
http://savi.cvs.sourceforge.net/viewvc/savi/savi-dev/src/gv_init.c?revision=1.1&view=markupWhether using IrixGL or OpenGL might matter?

 
Lloyd Wood
http://savi.sf.net/
----- Original Message -----
From: Claus-Justus Heine <hi...@cl...>
To: geo...@li...
Sent: Sunday, 17 April 2016, 2:13
Subject: Re: [geomview-users] Geomview OpenGL rendering on sgi irix

Am 16.04.2016 um 17:58 schrieb Claus-Justus Heine:
> Hi Lloyd,
[snip]
> Could be some hidden endianess problem, Irix has the wrong (aka network)
> byte ordering. Is this visible on the picture from the "viewtopic" link,
> i.e. should the north-pole be "down under" on the picture?

I see what you mean (further below in that thread). Is it possible to
get a snippet of Geomview input which generates the textured sphere? I
suppose that the wireframe as well as the colouring of the continent is
generated by 2 different textures, which different mappings of texture
coordinates?


Best,

Claus

-- 
Claus-Justus Heine                      hi...@cl...

http://www.claus-justus-heine.de/

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