stephen parkinson nous apporta ses lumieres en ce 2005-06-16 23:18:

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> is it me or are the chainwheels different sizes ?
> 
> stephen
To Stephen:
On modern tandem, there are 2 chains. The first runs between the 2 pedaliers, It use
smaller gears. 
The second one runs from the back pedalier to the rear wheel and use a larger gear.
Those chains are 
also on oposite sides, the front one been on the left side. This is to let you have a
front deraileur.

To 3D_Fusion:
You may want to tweak your radiosity settings.
ambient_light in global_settings multiply any ambient value used, set to zero, it
prevent you from 
using any high ambient object as light source. Better to set #default{finish{ambient
0}}
Setting pretrace_end to a lower value may give some improvement, try 0.02 or 0.01 (use
the 
pretrace_start value divided by a power of 2 for _end as POV Ray divide the tiles size
by 2 for each 
step)
Increasing brightness to a little over 1 will brighten the whole scene.
assumed_gamma 2.50 darken the scene, try reducing this value closer to 1.
If you don't use normals in the scene, you should set normal off, it will save you
some render time.
The 3 auxiliary lights can be replaced by one having the following colour: rgb<2.2,
2.2, 1.2> adding 
all 3 in one. This will accelerate the rendering speen by reducing the number of
lights.
In fact, I'd replace the main light and the 3 auxiliary ones by 1 much stronger one.
Keep the 
area_light, but add fade_distance dist and fade_power 1.8. Set it's colour to
something like 
rgb<120,120,100> fade_distance 1 (the extent of the area_light) fade_power 2
You can use a larger value for the area_light aray, 17*17 is a good choice, very
smooth results, not 
much longer using adaptive 0. I'd use adaptive 1, or use no_shadow on the pull chain,
now your pull 
chain will cast 2 shadows, unless that's what you want.  (small object close to the
area_light)

Alain

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