Hi Dom - a bit of delay to answer but I didn´t find any time earlier Which kind of shadows are weird or unfiting for you?
Or maybe you could post an example here for either: what do you want to avoid or: any example for your desired result?
Basically I see 3 possibilities to render a ground plan - these possibilities also apply to other render tasks as well of course.
I’d like to state before, that within RI always shines a physical sky sun, which always does this in dependence of your used SU-sun settings.
RI´s physical sky sun always produces shadows !!! - I hope we get more options here in future RI versions
PIC. 1 is the SU standard situation: daylight with shadows on the ground.
The ground here is provided by RI and it is located on level 0 (as if it would be the SU standard ground)
PIC. 2 is the SU standard situation: daylight with shadows on the ground like in PIC. 1
The ground here is also provided by RI but it is located on level -1000.000. (as if you would turn off SU shadows on ground within SU)
This floor setting avoids shadows in the surrounding area at least.
Of course, shadow remains here as well, but this is now so far away that it is not in the field of view in general - just a little work aröund
PIC. 3 isn´t the SU standard situation ! - Within SU I’ve set a night time-scene which avoids all shadows which might be caused by the sun.
So instead of sunlight, I have placed artificial light sources here, which are also set to 0 shadow causing. This little trick provides the most neutral lighting.
Whether this kind is a better lighting - you have to decide for yourself - Anyway - artificial lighting provides the most of lighting influence for you.
Another tip is - always export to PSD what gives you the best possibility to remove disturbing environment with one click for further postpro.
I hope this will help you further on and please let me/us know and see what you will achieve