"Tek" <tek### [at] evilsuperbraincom> wrote:
> That's a very different approach to what I'm doing. Though the results look
> nice.

For the more artistic matter, here are two different function blob macros of
mine. If you want to create a surface that is as smooth as possible, the
exponential blob is the right choice, but the final shape is hardly predictable,
so it's a bit of trial-and-error. The arctangent blob is less smooth, but it's
easier to handle, because the shapes do not change as much as in the first case.

The code:

// exponential blob
// fn_exp_blob (FUNCTION, FLOAT)
// fn_exp_blob_element (FUNCTION, FLOAT)
// [fn_exp_blob_element (FUNCTION, FLOAT)]
// ...
// fn_exp_blob_end ()
// param#2: threshold
#macro fn_exp_blob (fn_1, fn_th)
    function {1 + fn_th - pow (fn_th, fn_1 (x, y, z))
#end
#macro fn_exp_blob_element (fn_1, fn_th)
    - pow (fn_th, fn_1 (x, y, z))
#end
#macro fn_exp_blob_end ()
    }
#end

// arctangent blob
// fn_atan_blob (FUNCTION, FLOAT)
// fn_atan_blob_element (FUNCTION, FLOAT)
// [fn_atan_blob_element (FUNCTION, FLOAT)]
// ...
// fn_atan_blob_end ()
// param#2: threshold
#macro fn_atan_blob (fn_1, fn_th)
    function {(atan (fn_1 (x, y, z)/fn_th)
#end
#macro fn_atan_blob_element (fn_1, fn_th)
    + atan (fn_1 (x, y, z)/fn_th) - pi/2
#end
#macro fn_atan_blob_end ()
    )/pi*2}
#end


You can use it like this:

#declare my_blob_function =
    fn_exp_blob (function_1, threshold_1)
    fn_exp_blob_element (function_2, threshold_2)
    [fn_exp_blob_element (function_3, threshold_3)]
    ...
    fn_exp_blob_end ()


Florian

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