v3f ax, ay, az, bx, by, bz;
m3x3_mulv( ra->to_world, (v3f){1.0f,0.0f,0.0f}, ax );
m3x3_mulv( ra->to_world, (v3f){0.0f,1.0f,0.0f}, ay );
v3f ax, ay, az, bx, by, bz;
m3x3_mulv( ra->to_world, (v3f){1.0f,0.0f,0.0f}, ax );
m3x3_mulv( ra->to_world, (v3f){0.0f,1.0f,0.0f}, ay );