bool BKE_mball_minmax_ex(MetaBall *mb, float min[3], float max[3],
float obmat[4][4], const short flag)
{
const float scale = obmat ? mat4_to_scale(obmat) : 1.0f;
MetaElem *ml;
bool changed = false;
float centroid[3], vec[3];
INIT_MINMAX(min, max);
for (ml = mb->elems.first; ml; ml = ml->next) {
if ((ml->flag & flag) == flag) {
const float scale_mb = (ml->rad * 0.5f) * scale;
int i;
if (obmat) {
mul_v3_m4v3(centroid, obmat, &ml->x);
}
else {
copy_v3_v3(centroid, &ml->x);
}
/* TODO, non circle shapes cubes etc, probably nobody notices - campbell */
for (i = -1; i != 3; i += 2) {
copy_v3_v3(vec, centroid);
add_v3_fl(vec, scale_mb * i);
minmax_v3v3_v3(min, max, vec);
}
changed = true;
}
}
return changed;
}
void strand_minmax(StrandRen *strand, float min[3], float max[3], const float width)
{
StrandVert *svert;
const float width2 = width * 2.0f;
float vec[3];
int a;
for (a=0, svert=strand->vert; a<strand->totvert; a++, svert++) {
copy_v3_v3(vec, svert->co);
minmax_v3v3_v3(min, max, vec);
if (width!=0.0f) {
add_v3_fl(vec, width);
minmax_v3v3_v3(min, max, vec);
add_v3_fl(vec, -width2);
minmax_v3v3_v3(min, max, vec);
}
}
}