Mapping c3DShininess to property 'Shininess'

Regina Henschel <rb.henschel@xxxxxxxxxxx> · Wed, 19 Jan 2022 18:38:05 +0100

Hi Miklos, hi all,

I'm going to implement 'Shininess' for extruded custom shapes.

The chain is
MS c3DShininess
  |
  | import
  ↓
API 'Shininess' = ODF 'draw:extrusion-shininess'
  |
  | rendering
  ↓
SDRATTR_3DOBJ_MAT_SPECULAR_INTENSITY

From experiments I know
  SDRATTR_3DOBJ_MAT_SPECULAR_INTENSITY = 2^c3DShininess.

I'm going to use API 'Shininess' = 10 * c3DShininess. That maps MS 
default 5 to ODF default 50%. It would imply, that for rendering an ODF 
document SDRATTR_3DOBJ_MAT_SPECULAR_INTENSITY= 2^(ODF/10) is used.

Do you have any concerns or a better idea?

Should I do it immediately in 
https://gerrit.libreoffice.org/c/core/+/128449? Or should I keep the 
fixed value 32 for nIntensity there temporary and implement 'Shininess' 
in a separate patch?

Kind regards,
Regina