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Camera:
The way to controll the orthographic camera has changed. The 'old
trick' to put the orthographic statement all the way at the end of
the camera statement results in a error now. Read all about how still to use
this feature in Orthographic projection.
Filter:
In layered textures, filter used to work the same as transmit. It has been
changed to work as filter should. This can change the appearance of "pre 3.5" textures a lot.
Solution: Use the #version directive to switch between desired behavior.
An other option in old scenes is to replace the filter by transmit.
Note: The predefined textures, like in woods.inc, have been changed accordingly.
Gradient:
The gradient pattern used to reverse / mirror for negative values along the specified
orientation vector. This is not the case anymore.
Solution: If only the range -1 to 1 was used of the old gradient, for example in a sky_sphere,
it can be replaced by the planar pattern and revert the color_map.
A more general solution is to use function{abs(x)} as a pattern instead of gradient x
and similar for gradient y and gradient z.
Log:
The float function log used to be the natural logarithm, as per version 3.5 it is 10-based.
For the, e-based, natural logarithm ln is added. This change also affects the julia_fractal.
Solution: replace log by ln.
Media:
In POV-Ray 3.1, it was the use of filter or transmit, in the media container, that
determined whether the media would cast a shadow or not. As per version 3.5 a media
always casts a shadow.
Solution: if shadows are not wanted, add the no_shadow keyword to the media container.
Noise:
New noise functions have been added in POV-Ray 3.5. Noise functions are internaly used in patterns.
The default function in 3.5 is not the same as it was in 3.1 and earlier. This may affect the
appearence of textures in old scenes.
Solution: put noise_generator 1 in global_settings{}.
Radiosity:
In POV-Ray 3.1 radiosity calculations were based on the ambient value of objects. These
calculations are now based on the diffuse value of objects. Also many other aspects of
radiosity have changed.
Solution: Rewrite the scene.
Note: Radiosity is still an experimental feature, for future POV-Ray versions backwards compatibility can not be guaranteed.
Spotlight:
The default values for the spotlight have changed:
radius: 30 (old: 70) degrees
falloff: 45 (old: 70) degrees
tightness: 0 (old: 10)
Also the tighness for cilinder lights has changed to 0 (was: 10).
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