[tuhopuu-devel] New development of the material system.

[Chris Want]

As I mentioned in our conversation, I'm a
bit apprehensive about changes that break
reverse compatibility, and as this relates to
the material settings it would potentially
effect almost every blend. Please note that
there is a function do_versions() in
source/blender/blenloader/intern/readfile.c
that is used for loading older blends and
making them compatible with changes that
would otherwise break reverse compatibility.

Also of note: the 'Parameter' pull down that sets what
material property is effected by the texture
does not support negative values (remember those
were tri-state buttons) and also one can not
set more than one channel per texture
... what's up with that?

Chris

P.S. can you supply an example blend that
exhibits this 'non-fatal' reverse incompatibility?

Nathan Vegdahl wrote:
>    I have made yet another addition/modification to the material system.  
> However, it breaks compatability (non-fatally) with older blend files: the 
> texture mixing settings are not loaded correctly.
> 
>    The addition is as follows: textures can now effect the parameters of the 
> previously added material models.  If have structured it in such a way as to 
> prepare for the plugin system.  Unluckily, it is this very structure that 
> causes the compatability problem.
> 
>    Here is a diff, so that you can try it out yourself:
>    http://www.brunslo.com/cessen/blender_stuff/cessen.diff
> 
>    I would like to start a list discussion about the following two things:
>       1) How it could be changed to still be compatable with old blend files, 
> while not making it complete pain to impliment the plugin system.
>       2) Whether or not it should be committed as-is.
> 
>    Thanks!
> 
> --Nathan Vegdahl (Cessen)
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