[Bf-committers] Re: [Bf-blender-cvs] CVS commit: blender/source/blender/makesdna DNA_material_types.h blender/source/blender/render/intern/source rendercore.c blender/source/blender/src buttons_shading.c

[Matt Ebb]

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On 29 Jul 2004, at 9:05 PM, Ton Roosendaal wrote:

> Hi,
>
> Order as I prefer is based on operations and its negation together;
>
> 1. Mix
> 2. Add / Subtract
> 3. Mult / Screen
> 4. Divide / Difference
> 5. Darken / Lighten
>
> Coincidentally, the first four is in similar order as previously in 
> Blender, with new options added. The 'screen' command is a variation 
> of multiply.
>
> The last 2 have wrong names btw, the operation doesnt darken/lighten 
> at all, but is a comparision between 2 colors, choosing either the 
> lightest or darkest. It seems to be common to name it this way though.

How does that help a user? I look through the blend modes with a 
purpose in mind "Hmm, I want something to make the texture look 
darker". It's not nearly as conceivable that one will look through the 
list thinking "Hmm, I want something to  compare two colours and choose 
the darkest or lightest", and that's assuming that an artist will know 
that this is how it works at all, which is not very probable.

Your example of screen and multiply shows that you're thinking from a 
developer's point of view. In terms of the end result shown to an 
artist, 'screen' is in no way a variation of multiply. Until I actually 
looked at the example source code, I had no absolutely no idea that 
screen and multiply were related and I'd been using them in Photoshop 
for years and years.

Apologies to all who may see this discussion as petty, but user-centred 
design is important.

Matt
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