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Folks,
Beta 35 for Windows is now available via http://www.povray.org/beta/. The
source code isn't updated yet but will be posted in the next few days.
For Linux users, until a updated source archive is available, please follow
the instructions on the source download page for preventing the message
'please obtain an updated version of this application' from happening.
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Changes between 3.7.beta.34 and 3.7.beta.35
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Fixed the following bugs:
http://bugs.povray.org/task/10
http://bugs.povray.org/task/32
http://bugs.povray.org/task/48
http://bugs.povray.org/task/49
http://bugs.povray.org/task/51
http://bugs.povray.org/task/52
http://bugs.povray.org/task/53
http://bugs.povray.org/task/55
http://bugs.povray.org/task/57
http://bugs.povray.org/task/59
http://bugs.povray.org/task/61
http://bugs.povray.org/task/73
Implemented some media improvements that may significantly speed up scenes
using both "heavyweight" averaged or pattern-mapped textures (e.g.
micronormals) and interior media.
Subsurface light transport code should now properly handle light attenuation
due to distance, spotlight falloff or intervening non-opaque objects
(including media and projected_through objects). Diffuse ambient illumination
is also supported to some extent (multiple-scattering term only) when
radiosity is turned on (however, it does not actually call radiosity code at
present).
Radiosity maximum_reuse parameter now governs the maximum effective radius of
a sample more directly.
Various bug fixes and minor improvements in input file reading code.
Added "out-of-the-box" transparency support for GIF files.
Added support for PNG sRGB chunks.
NOTE: Non-legacy scene default gamma handling for image input files has
changed significantly from previous betas, affecting all file formats except
OpenEXR, Radiance HDR and (with minor differences) most flavors of PNG; there
will be NO corresponding warnings. See below for more detail.
---------------------------------------------------
Changes to improve input image file gamma handling.
---------------------------------------------------
Input image files not carrying unambiguous gamma information will now be
assumed to match a common gamma setting, and gamma-adjusted accordingly; this
common input file gamma setting can be specified in the scene file using the
following syntax:
global_settings {
file_gamma GAMMA
}
where GAMMA is either a numeric expression specifying the approximate display
gamma for which input files are assumed to be gamma pre-corrected, or the
keyword 'srgb' indicating that input files are assumed to match the sRGB
standard. (In the latter case, gamma adjustment is applied according to the
sRGB standard, instead of approximating with a gamma 2.2 power-law function.)
The default setting is sRGB.
Regardless of this global setting, gamma correction is not applied if the
image input file is obviously used as a mere data container, such as when
immediately used in a height field.
Default gamma handling rules for any image input file can be overridden by
specifying 'file_gamma GAMMA" immediately after the file name, e.g.:
image_map {
jpeg "foobar.jpg" file_gamma 1.8
interpolate 2
}
This also applies to contexts where gamma adjustment is not normally applied,
e.g. file formats that are defined to be encoded linearly, or files used in
height fields, to simplify handling of files not conforming to standards.
NOTE: Gamma handling for PNG input files has changed as follows in legacy
('#version 3.6') scenes:
- In the absence of an 'assumed_gamma' statement, non-indexed PNG files with
a gAMA chunk (i.e. virtually all PNG files) will appear far brighter than
with POV-Ray 3.6.
- In the presence of an 'assumed_gamma 1.0' statement, indexed PNG files
(uncommon) will appear darker than with POV-Ray 3.6.
- In the presence of an 'assumed_gamma 2.2' statement, PNG files with a gAMA
lower than 2.2 (uncommon) will appear darker than with POV-Ray 3.6.
- PNG files with an sRGB chunk but no gAMA chunk may appear significantly
different than with POV-Ray 3.6.
- PNG files may generally appear slightly different than with POV-Ray 3.6.
A warning will be printed in these cases, except for the latter.
------------------------
Added proximity pattern.
------------------------
The experimental "proximity" pattern uses data collected by the radiosity
code to create a gradient according to the proximity to nearby geometry, in
order to assign different texture properties to crevices; the syntax is as
follows:
texture {
proximity
texture_map { ... }
}
Values start at 1 in crevices, falling off exponentially to 0 in perfectly
open spaces. The pattern can only be applied to surfaces, and will not work
with media. As of now, only texture maps are supported; future versions are
expected to support pigment and normal maps as well.
In scenes not using radiosity otherwise, using the proximity pattern will
automatically activate a subset of the radiosity code with default
parameters. To specify non-default parameters without activating the full
radiosity code, add a radiosity block with "brightness" set to 0.
Note that this feature is still experimental, and both syntax and exact
functionality may be subject to change.
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Chris Cason wrote:
> Folks,
>
> Beta 35 for Windows is now available via http://www.povray.org/beta/.
Got it, and am testing it now. Thanks, everyone!
> texture {
> proximity
> texture_map { ... }
> }
This feature isn't working for some reason :(
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