Shadow corresondance between SU and TWILIGHT

[archigrafix]

I am sure I've already seen a topic about this but cant find it in the Forum... so I ask about it..!?
In fact I've to do a sun study for a client and I see that shadow direction is totally different from SU to twilight...hugh!
tried many things to solve but nothing. North direction is personnalised in SU perhaps it's the problem but I cant do else (of course I could rotate the model but it's counter productive way of working...all views are lost etc...)
thanx to help I am in a rush to render and thought it would be easy

[Chris]

There can be a difference between SU and Twilight when it comes to shadows, yes, that is true. But a huge difference? That shouldn't be. Can you post pictures?

[flipya]

Apart from your specific problem, rotating the model to change the sun's relative trajectory is not necessary. Just go to Window->Model Info and click Location, you can change the northangle here without messing up your views.

[Gaieus]

Apart from your specific problem, rotating the model to change the sun's relative trajectory is not necessary. Just go to Window->Model Info and click Location, you can change the northangle here without messing up your views.

North direction is personnalised in SU perhaps it's the problem

Could that actually be?

[Chris]

Twilight accounts for the possibility of the north angle being different than 0. If you change it, the Twilight shadows will adjust for the angle.

Like I said earlier, there is a difference in shadows because SU shadows are just a linear projection, where Twilight shadows are generated from a point light. But those differences should not be large.

[Gaieus]

Twilight accounts for the possibility of the north angle being different than 0. If you change it, the Twilight shadows will adjust for the angle...

True, I have tried ever since just forgot to come back to the topic.