Bruce, thanks for you explanation. It appears I missed to carefully read the Therion Book! Marco Marco On Wed, Oct 31, 2012 at 7:08 PM, Bruce <bruce@tomo.co.nz> wrote:
Marco****
I tested your example and got the result you described with both xvi and pdf outputs.****
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I think you have found the transition defined by ‘vthreshold’.****
From the Therion Book…****
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vthreshold <number> <units> ◃ threshold for interpreting LRUD readings as left-right-front-back reading perpendicular to the shot.****
If passeges are horizontal (inclination < vthreshold), LR is perpendicular to the shot and UD is vertical.****
If passages are more or less vertical (inclination > vthreshold), even UD becomes perpendicular to the shot – otherwise passages would not look very good. In the case of vertical shots, UD is interpreted as north-south dimension from the station to allow tube-like modelling of verticals****
“****
I had thought the default value of vthreshold was 60 degrees, but it seems it may be around 67.5 degrees.****
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Bruce****
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