b3dCollisionY

Returns Y world position of collision contact point (vertical coordinate, height). Takes entity (entity handle), index (collision index 0 to count-1). Returns Y coordinate (world space, vertical position). Gets collision[index].position.GetY() from g_entityCollisions. Use for spawn height, ground detection, or vertical impact analysis. Same behavior as b3dCollisionX but Y axis (up-down). Thread-safe, O(1), returns 0.0 if out of bounds.