66     ring *r;  in newring()  local
68     r = (ring *)rt_getmem(sizeof(ring));  in newring()
69     memset(r, 0, sizeof(ring));  in newring()
70     r->methods = &ring_methods;  in newring()
72     r->tex = (texture *)tex;  in newring()
73     r->ctr = ctr;  in newring()
74     r->norm = norm;  in newring()
75     r->inrad = inrad;  in newring()
76     r->outrad = outrad;  in newring()
78     return (object *)r;  in newring()
82     ring *r = (ring *)obj;  in ring_bbox()  local
84     min->x = r->ctr.x - r->outrad;  in ring_bbox()
85     min->y = r->ctr.y - r->outrad;  in ring_bbox()
86     min->z = r->ctr.z - r->outrad;  in ring_bbox()
87     max->x = r->ctr.x + r->outrad;  in ring_bbox()
88     max->y = r->ctr.y + r->outrad;  in ring_bbox()
89     max->z = r->ctr.z + r->outrad;  in ring_bbox()