func s_v3 slerp(s_v3 start, s_v3 end, float t)
{
    float dot = v3_dot(start, end);
    dot = clamp(dot, -1.0f, 1.0f);
    float theta = acosf(dot) * t;

    // nocheckin parenthesis?
    s_v3 relative_vec = v3_normalized(end - start * dot);
    return ((start * cosf(theta)) + (relative_vec * sinf(theta)));
}