> Working... whether (t1 >= ofs && t2 >= ofs) for he front child or (t1 < -ofs && t2 < -ofs) for the back child. When the bbox straddles the plane, I need to find where it first contacts. the plane during traversal. f moving from front to back, the contact point is at ((t1- ofs) / (t1 - t2)). HIGHLIGHTED: I’m looking at how the Source engine implements this with box expansion. Implementing box offset logic... I’m working through the math here— when the normal components positive, | pick the minimum coordinate, and when its negative, | pick the maximum. This gives me a signed distance that's always non-positive, which effectively moves the plane backward along its normal. The key insight s that this computes the.