Mapping continuity

Hello

Maybe some of you guys can help me out with this Idea that I have.PLEASE!

I am trying to map some lines in 2 geometries. A plane and a brep.

but I want to have continuity from the plane to the brep.

I am obviusly doing this in grasshopper (using a image to map the lines with the imagesampler) but this question goes beyond the software. it is more about geometry, I guess.

it involves to unwrape a geometry, but having always continuity from one to an other.

here a image of the concept

You have to keep in mind that the brep (in this case a circular shape) its longer than the shape of the plane. so it is difficult to place them flat in photoshop to paint and create the continuity.

here the images that I am using to map the lines on the geometries. I am using a definition that creates lines from a image black&white like this one

but in order to achive the continuity from the ground to the facade of the building I am thinking that the only posibility would be to use a software where I can paint a gemetry in 3D. LIKE ZBRUSH

but how do I get the map back out and flat to use is correctly in grasshopper?

anyone as any ideas?

Please!!!

THANKS!

HAVE A GREAT DAY!