An image is used as an 'underlay', and Im tracing on top of it .
- For example I could use an aerial photo,and trace over the outlines of buildings. I dont want to modify or replace the aerial image, I just draw faces on top of it, move them around, etc.
Once I have created faces, these are co-planar with the image. When I begin coloring them, it is quick for me to use the eyedropper to select colours from previously coloured faces..however, the eyedropper tool always wants to select the background image...even if the image is locked.
Drawing buildings on an aerial is a simple example. What I typically find myself doing is converting 2d information (from PDFs and scanned images) to create a 3d model, adding my own design information as I go. 2d images can include aerials, detailed architectural plans, landscaping and engineering site plans, topographical info, etc. I would be tracing and creating new geometry for buildings, carparks, hard surface treatments, plus 100s of other urban objects. It can get very complicated.
I just find the eye dropper keeps selecting the background image rather than the faces I've been working on..and that behaviour seems illogical to me.