|
 |
Merci Rene. This is a great help and will save me many hours of research.
Best,
Dennis
"smellenbergh" <sme### [at] skynet be> wrote in message
news:1ezhnxz.1xl4pg916b2xyyN%smellenbergh@skynet.be...
>
> Here are some hints to convert syntax of MegaPov isosurface to 3.5
>
> * braces {} are required with functions
> "function x+y"
> should be
> "function {x+y}"
>
>
> * parameters of a declared function must be specified when called
> #declare FUNC = function {x+y+z}
> isosurface { function {FUNC} }
> should be
> isosurface { function {FUNC(x,y,z)} }
>
>
> * using internal functions (See 7.7 functions.inc)
> all internal functions are included in the functions.inc and start
> with
> "f_xxx". Parameters are set between ( ) braces and begin with the x,y,z
> parameters)
> So, MegaPov's "sphere",<0.8>
> becomes
> #include "functions.inc"
> f_sphere(x,y,z,0.8)
> or, when declaring the function directly, without using the include
> file:
> #declare MySphere = function { internal(61) }
> isosurface{ function{ MySphere(x,y,z,0.8) } }
>
>
> * noise3d
> in 3.5 noise3d is treated as an internal function: use the
> function.inc and
> f_noise3d(x*4,y*4,z*4)/5
> Note that the noise uses pov's noise generator set in the global
> settings:
> global_settings{
> noise_generator 1 file://old 3.1g plateaud noise
> noise_generator 2 file://MegaPov 0.5 noise
> noise_generator 3 file://New 3.5 perlin noise
> }
> ...or use
> f_noise_generator(x,y,z, P0)
> * P0 : Noise generator number
>
> *The func_ names have been renamed
> func_0 > f_ellipsoid
> func_1 > f_blob
> func_2 > f_flange_cover
> func_2b > f_blob2
> func_3 > f_cross_ellipsoids
> func_4 > f_isect_ellipsoids
> func_5 > f_spikes
> func_9 > f_poly4
> func_10 > f_spikes_2d
> func_11 > f_quantum
> func_12 > f_helical_torus
> func_13 > f_comma
> func_16 > f_polytubes
> And the duplicate functions have been removed
> helix1 / func_6 > f_helix1
> helix2 / func_7 > f_helix2
> spiral / func_8 > f_spiral
> mesh1 / func_14 > f_mesh1
>
>
>
> * using function { pigments } in isosurfaces
> the pigment must be declared. When calling it, the dot notation must
> be used: FUNC(x,y,z).x
> This allows to use the channels of the color vector in a controlled way
> Allowed are:
> .x .u .red, .y .v .green, .z .t .blue, .filter, .transmit for the
> separate channels
> .gray or .grey for the gray value of the color vector
> .hf for the height_field value of the color vector (this was the
> method used in MegaPov)
> #declare Granny = function{
> pigment{
> granite scale 3
> color_map { [0 rgb 0] [1 rgb 1] }
> }
> }
> isosurface{function{f_sphere(x,y,z,1)+Granny(x,y,z).hf*0.2}}
>
>
> * sign is no longer used in 3.5 isosurface
> to switch inside/outside, turn the whole function negative:
> #declare Landscape = function { f_ridged_mf(x,y,z,1,2,10,1.1,2) }
> isosurface{function{ Landscape(x,0,z)-y }
> becomes
> isosurface{function{ -(Landscape(x,0,z)-y) }
>
>
> * sqr and cub no longer supported
> use ^2 and ^3 ,or pow(A,2) and pow(A,3)
>
>
> * sqrt x^y and ln are used in the mathematical form in 3.5
> Isosurface MegaPov internal 3.5 internal
> ---------- --------------- ------------
> sqrt(x) = sqrt(abs(x)) =sqrt(x)
> x^y = abs(x)^y =x^y
> ln(x) = ln(abs(x)) =ln(x)
> So, these MegaPov functions might need to be written as they have been
> used internally in MegaPov to get the same results in 3.5
>
>
> * if(A,B,C)
> has been replaced by select (A,C,B)
> MegaPov
> isosurface {function {if(-x, abs(x)+abs(y)-0.5, sqrt(z^2+y^2)-0.5)}
> becomes in 3.5
> isosurface{function{select(-x, sqrt(z^2+y^2)-0.5, abs(x)+abs(y)-0.5)}
>
>
> * method 1 and method 2
> keywords no longer used in 3.5: a method 2-ish method is standard
>
>
> * eval
> eval becomes evaluate and *requires* 3 parameters without the vector
> braces: evaluate A,B,0.99 which is the same as MegaPov's eval <A,B,0.99>
>
>
> I think these are the main changes, but I probably forgot some :-)
>
>
> --
> e-mail:sme### [at] skynetbe
>
> http://users.skynet.be/smellenbergh
Post a reply to this message
|
|
