//-----------------------------------------------------------------//
bool clumped_bspline(const fvtxs& src, int lod, fvtxs& dst)
{
int size = (int)src.size();
if(size < 4) return false;
dst.clear();
for(int n = -3; n < (size + 1); ++n) {
for(int i = 0; i < lod; ++i) {
float t = static_cast<float>(i) / static_cast<float>(lod);
float it = 1.0f - t;
// bezier
// float b0 = t * t * t;
// float b1 = 3 * t * t * it;
// float b2 = 3 * t * it * it;
// float b3 = it * it * it;
// clumped bspline
float b0 = it * it * it / 6.0f;
float b1 = (3.0f * t * t * t - 6.0f * t * t + 4.0f) / 6.0f;
float b2 = (-3.0f * t * t * t + 3.0f * t * t + 3.0f * t + 1.0f) / 6.0f;
float b3 = t * t * t / 6.0f;
fvtx v0 = get_vtx(src, n + 0);
fvtx v1 = get_vtx(src, n + 1);
fvtx v2 = get_vtx(src, n + 2);
fvtx v3 = get_vtx(src, n + 3);
fvtx v;
v.x = b0 * v0.x + b1 * v1.x + b2 * v2.x + b3 * v3.x;
v.y = b0 * v0.y + b1 * v1.y + b2 * v2.y + b3 * v3.y;
v.z = b0 * v0.z + b1 * v1.z + b2 * v2.z + b3 * v3.z;
dst.push_back(v);
}
}
return true;
}
void asteroid_init(struct asteroid *a, double vel)
{
get_vtx(a, LARGE_RAD);
a->rad = LARGE_RAD;
a->enable_draw_wrap = false;
smp_obj_init((void*)a, 2);
a->is_alive = true;
phys_obj_init((void*)a, &phys_methods, NULL, 0);
set_outside_spawn_pos_vel((void*)a, LARGE_RAD, vel);
a->rotational_vel = drand() * MAX_ROTATIONAL_VEL;
a->bnd = BND_GHOST;
a->hb[0].rad = LARGE_RAD + MAX_VARIANCE * LARGE_RAD / 2.0;
graphics_obj_init((void*)a, &draw_methods);
a->type = OBJ_ENEMY;
a->targetable = true;
}
