Hi, I want to colour objects on a city scale drawing, where I need to specify the colour of the buildings per neighbourhood. In Photoshop, I would select the building layer and use a mask on a colour filled layer. Is there such a workflow for illustrator too (one that does not involve using the pathfinder, since that'll be too heavy given the tens of thousand of objects)?
If you can create a shape of the neighbourhood an fill it with black or white, you can put it on top of a rectangle filled with color.
Select both and click Make Mask in the Transparency panel. You will need to check or uncheck the Clip / Invert Mask options, depending on the fill of the mask shape.
That creates a flat color. You may want to experiment with opacity setting and / or blend modes.
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