Master renderman procedural primitive DSO

Renderman provides a wide range Program Methods for generating ry, including rib Generation Based on external programs and direct interface call based on dso. I will create a PRT particle file that directly renders karakatoa to demonstrate how to make a similar plug-in to improve production efficiency. The DSO in this article is compiled under the vc8 32bit compiler, and the results obtained under RPS 13.5.2 and aqsis 1.6.0 are identical. The following is a starting DSO used to generate a 3D Sobol sequence and display it.

Code
// Prtrender

# Ifdef windows
# Define Prtrender extern "C" _ declspec (dllexport)
# Pragma Comment (Lib, "prman. lib ")
# Pragma Comment (Lib, "libgsl. lib ")
# Else
# Define Prtrender extern "C"
# Endif

# include stdlib. h >
# include stdio. h >
# include string . h >
# include math. h >
# include time. h >

# Include<Ri. h>

# Include<GSL/Gsl_qrng.h>

Prtrender
Rtpointer convertparameters (rtstring paramstr)
{
//Rtstring filepath = strdup (paramstr );
//Fprintf (stdout, "prtrender DSO info: Import PRT @ [% s] \ n", filepath );
//Return (rtpointer) filepath;
}

Prtrender
Rtvoid subdivide (rtpointer data, rtfloat detail)
{
Rtint n =   1024 ;
Rttoken varp = { " P " };
Rttoken varcwidth = { " Constantwidth " };

Gsl_qrng * Qrng = Gsl_qrng_alloc (gsl_qrng_sobol, 3 );

Rtfloat * P = (Rtfloat * ) Malloc ( Sizeof ( Float ) * N * 3 );

For ( Int I = 0 ; I < N; ++ I)
{
Double Singlesobol [ 3 ];
Gsl_qrng_get (qrng, singlesobol );

Int J = I * 3 ;
P [J + 0 ] = Singlesobol [ 0 ] *   2.0   -   1.0 ;
P [J + 1 ] = Singlesobol [ 1 ] *   2.0   -   1.0 ;
P [J + 2 ] = Singlesobol [ 2 ] *   2.0   -   1.0 ;
}

Rtfloat cwidth =   0.01f ;
Rttoken datavar [ 2 ] = {Varp, varcwidth };
Rtpointer datapointers [ 2 ] = {P, & Cwidth };

Ripointsv (n, 2 , Datavar, datapointers );

Free (P );
Gsl_qrng_free (qrng );
}

Prtrender
Rtvoid free (rtpointer data)
{
//Free (data );
}

This is the particle model created in Maya, exported as a PRT file, and then directly rendered after reading it using DSO.

Renderman supports to generate procedural primitives dynamically, based on both external stdin/stdout execute or DSO. the first is less efficient because the render has to parse the rib into Ri callagain. I will show you how to use this feature to render karakatoa participant from an PRT file in renderman-like render. this DSO has been tested in RPS 13.5 and aqsis 1.6. let's begin from an tiny DSO which generate 3D Sobol quasi-random sequence. we made the participant in Maya, exported it as PRT file, and then rendered it by DSO directly.