Function ConvertFakePlaneToPlane

TombEngine/Specific/level.cpp:837–849

The way floordata "planes" were previously stored was non-standard. Instead of a Plane object with a normal + distance, they used a Vector3 object with data laid out as follows: x: X tilt grade (0.25f = 1/4 block). y: Z tilt grade (0.25f = 1/4 block). z: Plane's absolute height at the sector's center (i.e. distance in regular plane terms).

// y: Z tilt grade (0.25f = 1/4 block).
// z: Plane's absolute height at the sector's center (i.e. distance in regular plane terms).
static Plane ConvertFakePlaneToPlane(const Vector3& fakePlane, bool isFloor)
{
	// Calculate normal from tilt grades.
	int sign = isFloor ? -1 : 1;
	auto normal = Vector3(-fakePlane.x, 1.0f, -fakePlane.y) * sign;
	normal.Normalize();

	// Determine distance.
	float dist = fakePlane.z;

	// Return plane.
	return Plane(normal, dist);
}

void LoadDynamicRoomData()
{