[Therion] Conflict between "extend ignore" command and inverse legs

[Bruce Mutton]

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 <therion-bounces at speleo.sk> On Behalf Of Marco Corvi via Therion
Sent: Thursday, 7 June 2018 11:29 PM
To: therion at speleo.sk
Cc: Marco Corvi <marco.corvi at gmail.com>
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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