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Constant radius corners and sloping ground?

R Soul

1000RPM
Apr 19, 2009
1,021
220
38
Does anyone know how real track builders create constant radius corners when the ground is not flat? Usually a track is designed in top view (not just BTB, but CAD and other methods too). However if you take a circle and project it down onto a slope (imagine a perfect shadow), the resulting line will no longer be a perfect curve from the driver's point of view.

In top view this corner is perfectly circular:


But when projected onto a steep slope like this (imagine just moving a node downwards):


I think the driver's experience would be that the corner's radius changes:


So, should a track's top view be changed to take this effect into account?
 

Emery

2000RPM
Jun 6, 2009
2,550
1,181
Laguna Seca (er, Mazda Raceway Laguna Seca) and Mosport (er, Canadian Tire Motorsport Park) both have published plans and they show the constant radius turns from a top view despite elevation changes.
 

R Soul

1000RPM
Apr 19, 2009
1,021
220
38
Thanks for your reply. I'm probably over-thinking things. I think I'll just plan constant radius corners and adjust the exits if the seem to get tighter.