On 10-10-2012 16:41, Anthony D. Baye wrote:
> Thomas de Groot <tho### [at] degrootorg> wrote:
>> On 10-10-2012 12:15, Jaime Vives Piqueres wrote:
>>> On 10/10/12 10:06, Anthony D. Baye wrote:
>>>> The boards are made from an isosurface that uses the function:
>>>>
>>>> f_rounded_box(x,y,z,0.125, W/2-0.03125*OldWood(x-_X,y-_Y,z-_Z).x,
>>>> T/2-0.078125*OldWood(x-_X,y-_Y,z-_Z), L/2+0.25)
>>>>
>>>> Where W, T and L are Width, Thickness and Length and _X, _Y, and _Z
>>>> are supposed to be random translations, but I don't think that
>>>> they're getting re-calculated every time the macro is called, or if
>>>> they are, they're always the same.
>>>
>>>     But there you are translating the isosurface function, not the texture
>>> later applied to it: you need to translate it independently.
>>
>> Exactly.
>>
>>>
>>>     BTW, after seeing at last the "problem object", I think it has an easy
>>> solution, as long the base the texture is the same for all: just lay the
>>> "global" texture at each sub-object:
>>>
>>> union{
>>>     object{board1
>>>       texture{t_wood
>>>         // local transforms here
>>>       }
>>>       texture{t_dirt}
>>>     }
>>>     object{board2
>>>       texture{t_wood
>>>         // local transforms here
>>>       }
>>>       texture{t_dirt}
>>>     }
>>>     ...
>>> }
>>
>> And of course, the randomness of the pattern is easy to include in this
>>
>> union{
>>      object{board1
>>        texture{t_wood
>>          // local random translate here
>>          // local transforms here
>>        }
>>        texture{t_dirt}
>>      }
>>      object{board2
>>        texture{t_wood
>>          // local random translate here
>>          // local transforms here
>>        }
>>        texture{t_dirt}
>>      }
>>      ...
>> }
>>
>> Note that if you use this for the horizontal and diagonal boards, you
>> may have to counter-rotate the dirt texture by the same amount, in order
>> to get a correct (?) image.
>>
> I have been translating the texture.  It's still not having an effect because _X
> _Y and _Z are always the same...  I'll post the source next time I'm at my
> computer.

Hmmm... You need to make a randomness macro, which is called each time a 
texture is applied (not tested):

#local R = seed(123);
#macro RandTrans(R)
   translate rand(R)
#end

which would be used as follows:
         texture{t_wood
           RandTrans
           // local transforms here
         }

>
> As for your texture solution:  It might work if dirt was all I was working
> with.  But I also want to add serial numbers, company logos and handling
> instructions like "this end up" or "fragile" etc...

Yes, that makes it difficult indeed... I have to ponder this a bit more...

Thomas

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