ebrain a écrit:
Un article sur la modification de l'option Shadow Only :
http://code.blender.org/index.php/2011/03/improved-shadows-only-material/

Transparency patch: makes sure that materials are not rendered
transparent if the use_transparency check is disabled. Adds a new
transparency option 'MASK' for enabling the old behaviour.

* rationale
The use_transparency check in the transparency panel header may lead
the User to expect that, by unchecking it, every transparency effect
will be disabled.
That’s confusing, since alpha, fresnel and blend parameters are
still used to perform background masking.

* usage
With transparency check ON: the material will render as before.
The new option MASK is analogous for an old material with
transparency check off.

With transparency check OFF:
Every transparency effect in the material will be disabled.
The material will render solid.
- disable alpha, fresnel transp, specular transparency
- disable texture mapped to alpha and transparent facetexture
- disable transparent object color
- will not project transparent shadows
- shadow-only materials will have alpha=1.0
- if reflected or refracted will appear solid