void
newimage( /* start a new image */
char *s
)
{
int newnp = 0;
/* # rendering procs arg? */
if (s != NULL)
sscanf(s, "%d", &newnp);
/* free old image */
freepkids(&ptrunk);
/* compute resolution */
hresolu = dev->xsiz;
vresolu = dev->ysiz;
normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu);
ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0;
ptrunk.xmax = pframe.r = hresolu;
ptrunk.ymax = pframe.u = vresolu;
pdepth = 0;
/* clear device */
(*dev->clear)(hresolu, vresolu);
if (newparam) { /* (re)start rendering procs */
if (ray_pnprocs)
ray_pclose(0); /* should already be closed */
if (newnp > 0)
nproc = newnp;
if (nproc > 1)
ray_popen(nproc);
newparam = 0;
} else if ((newnp > 0) & (newnp != nproc)) {
if (newnp == 1) /* change # rendering procs */
ray_pclose(0);
else if (newnp < ray_pnprocs)
ray_pclose(ray_pnprocs - newnp);
else
ray_popen(newnp - ray_pnprocs);
nproc = newnp;
}
niflush = 0; /* get first value */
paint(&ptrunk);
}
void
ray_pinit( /* initialize ray-tracing processes */
char *otnm,
int nproc
)
{
if (nobjects > 0) /* close old calculation */
ray_pdone(0);
ray_init(otnm); /* load the shared scene */
ray_popen(nproc); /* fork children */
}