In article <38c02ff0$1@news.povray.org>, "Hartmut Wagener" 
<har### [at] arcormailde> wrote:

> Hi,
> 
> one of my old pov-files renders extremely dark. After replacing the
> pvengine-file to the old one, the files render o.k. .
> 
> What can be done against this?

Are you using radiosity or layered textures using filter instead of 
transmit?

Radiosity went through quite a few changes, the updated version in 
MegaPOV fixes some bugs, and removes some of the limits on the old 
version. It is also quite a bit faster and gives better results, at 
least if you use the right settings. If you just reuse the settings for 
the old version, it almost definitely won't come out right.

Also, in MegaPOV, layered textures using filter will filter the layers 
beneath them. In the official version, filter and transmit both behaved 
like transmit. If you are using filter and want to convert your layered 
textures to MegaPOV(and probably POV 3.5, when it is released), just set 
the value for filter to 0(or leave it out) and add it's value to 
transmit. If your scenes use notation like rgbf <...>, the conversion is 
easy, just change "rgbf" to "rgbt".
Note that this is only for layered textures, though. Ordinary textures 
work as you would expect.

You can also use the #version directive to use older textures, like this:
#version official 3.1;
...old version texture stuff...
#version unofficial 0.4;
...MegaPOV scene stuff...
but you should probably go to the trouble of fixing your textures.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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