The Modeling Toolkit in Maya 2014 finally allows us to properly trace background polygon objects while modeling.
1. Open up the Toolkit (icon top right corner)
2. Activate the Toolkit (options - Activate Modeling Toolkit)
3. Select the reference object to snap to...
Transform Constraints - Other Surface - (Pick Object)
4. Now tweak the vertices
An easier method uses my Toolkit Marking Menu (ctrl alt d)
1. Select the reference object
2. ctrl alt d - select constrained object
to switch off constrained object
ctrl alt d - Constrained Off
Presenter: Andrew Silke (Avatar, Harry Potter, Gravity)
Website: www.create3dcharacters.com
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Software: Maya 2014