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How to mask or exclude everything outside the contour line shapes.

Question asked by RC123 on Dec 30, 2016
Latest reply on Dec 30, 2016 by RC123

The images below are kind of crude but I hope they help explain what I am trying to accomplish.  The blue background is a TIN and the star shapes are from a shapefile with contour lines.  How can I get the TIN to only show the data inside the contour lines?  Do I mask the TIN or re-create the TIN?  Or, extract by mask?  The contour lines represent lake depths and there are actually many more lines within the shapes/lakes.  The TIN shows the depths which are negative.  The blue area outside the shapes is identified as having a depth of -5 so that area might be lowland or swamp or something but I want to exclude it from the TIN.  If I try to change the color of any area that is -5 then I loose the color inside the shapes as well as outside the shapes.

     what it looks like now above and what I want it to look like below

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