BUG: Site Rotation Translated Incorrectly

[MatthewSteen]

By 180*. For example if the user enters 90* as the site rotation in VE, the resulting orientation in CBECC-Com will be 270*.

Site Rotation = 90* in VE

https://onedrive.live.com/redir?resid=F ... hoto%2cpng

Results in...

Building Orientation = 270* from CBECC-Com (orange line)

https://onedrive.live.com/redir?resid=F ... hoto%2cpng

[macleodd]

Hi Matthew
I've checked with our in-house Sketchup expert, and he confirms that your second screenshot (from Sketchup) shows a rotation of 90 degrees clockwise from North. This is exactly the same as a 270 degrees anticlockwise rotation in VE ModelIT.

Regards, Donald

P.S. you scared me a little there, as there was a previous issue [0076195] where, as a result of a mix-up between ourselves and the CBECC developers, our generated XML was indeed out by 180 degrees. However this was fixed in the Hotfix issued in February 2015.

[MatthewSteen]

Donald,

Both VE and CBECC-Com read building rotation using the right hand rule or counter-clockwise. I'm still seeing this bug in VE 2015.1.0.0. The images above show a site rotation of 90* entered in VE (north arrow to left) which results in a rotation of 270* in CBECC-Com (north line to right). Am I missing something?

[macleodd]

No I can assure you you are not missing anything Matthew.
On deeper inspection we appear to have misinterpreted the change that CBECC made.
Their (updated) definition is to rotate the y-axis clockwise from North (was previously anticlockwise), while the VE definition is to rotate North anticlockwise from the y-axis. Of course these are actually the same rotation! Drawing a diagram might help

This will be fixed in the next VE release (late November), or in an earlier hotfix if one is scheduled.
In the meantime you could work around it, only for Title24 simulations, by entering into VE the true rotation subtracted from 360 degrees.
Prior to running any Apache simulation, remember to revert to the true rotation.

Regards Donald