Hi Marco
I am not sure I understand, let me test my thinking, for everyone to pick apart
:)
I think the extend options provide control of the non-splay survey legs. In
general that control amounts to left, right, vertical, not at all, or not
visible.
The splay legs should just ‘wobble around’ as a second order effect, in
response to the extend parameters applied to the non-splay legs.
So the only sensible behaviour for splays is ‘extend auto’, and my observation
is that this is already coded into PocketTopo and Therion, and so there is no
reason to require the user to invoke ‘extend auto’ manually.
As noted in previous threads, Therion and PocketTopo do manage to orient splay
legs differently. Quite often I have to mentally reorient splays when drawing
in Therion Drawing Editor. Neither application seems to do it perfectly, but
then because the shape of the extended centreline network is as much an
arbitrary artistic choice on the part of the user, as it is based on hard
numeric data, there is perhaps no ‘right approach’ for the software to take. I
suspect that I have observed that TopParser can affect the orientation of
splays as well, but I am not sure of that.
I think the right approach is to aim for Therion (and PocketTopo, TopoDroid) to
orient splays automatically, based on the extend directions of the incoming and
outgoing non-splay legs. If the applications were to allow direct user control
of splay extend direction, then the statements should not be able to be
confused with existing statements that control the non-splay legs (ie adopt
extend splay left, extend splay right, extend splay vertical, extend splay
auto). Perhaps this topic is something the authors should collaborate on to
achieve a consistent behaviour?
What do you think?
Bruce
From: Therion On Behalf Of Marco Corvi via Therion
Sent: Thursday, 7 June 2018 11:29 PM
To: therion@speleo.sk
Cc: Marco Corvi
Subject: Re: [Therion] Conflict between "extend ignore" command and inverse legs
I have commented all the splays "extend ignore", and Therion is doing
now a good job, ignoring the appropriate leg (extend ignore 83 92). All
the splays "extend ignore" was confusing the Therion compiler.
This data is an export from Topodroid, that incorporates the "extend
ignore" command before the splays shots. I will comment to Marco Corvi
on the problem.
@ Evaristo & Bruce:
what about a command "extend auto", which means let therion decide how to
extend the splay shot ?
for the moment therion parser could behave as if the command weren't there.
marco
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