Am 01.09.2010 16:55, schrieb Darats:
> Hi,
>
> I've just tried the new 3.7 beta 38 for windows (which is the first beta release
> I've tried).
>
> My problem is that when I try to render the rad_def_test.pov, I only get a black
> image, and I can't figure out why.

POV-Ray 3.7 complements the "ambient" finish parameter with another one, 
"emission", to distinguish between some added brightness for fake 
ambient illumination (classic "ambient" keyword), and genuine object 
glow (new "emission" finish keyword).

The fake ambient illumination is now automatically turned off when 
radiosity is used, as that's exactly what radiosity is designed to 
compute more realistically. (Think of "ambient_light" automatically 
being forced to zero.) As a consequence, the "ambient" mechanism can no 
longer be used to model light sources in radiosity-only scenes.

Enter emission. This new mechanism does virtually the same as "ambient", 
except that it is unaffected by the global "ambient_light" parameter, 
and is active in both classic and radiosity scenes.


There are two simple solutions to fix existing scenes:

(A) Replace the "ambient" keyword with "emission" wherever it is used to 
model a light source.

(B) Alternatively, place a "#version 3.6" statement in the scene. 
POV-Ray will then revert to a backward-compatibity mode, leaving the 
"ambient" mechanism active in radiosity scenes.


> I'm sure it's just some settings I haven't thought about but I don't know what.

Nothing wrong on your side. The sample scenes just haven't been updated 
yet to match the new mechanism.

Post a reply to this message