After that you can use that raster as a displacement map in your 3D-modelling software.
When you have the contours prepared with an elevation attribute (or 3D coordinates if you could get them from the source), you can use the interpolation tool in the raster menu in QGIS to turn them into a heightmap raster. However, the best scenario would be if you could get the contours as proper geodata with 3D coordinates from the person who originally created the PDF. If doing it manually is not an option, you could concievably do some Python sorcery to iterate through the lines in some intelligent way to calculate the elevation. Depending on the total number of lines you could possibly do this manually. Once they are in QGIS, you need to create an attribute that contains the elevation of each line (ie. If you export the lines as DXF, you should be able to load them into QGIS. I'm looking to create a 3D representation from the contour lines in order to render it in a 3D modelling program - something like a. I can't seem to find anything that matches my situation.
What is the simplest/easiest way to create a 3D model with the available data? Can it be done with free/open source software? The contour lines (as paths in Illustrator) can be exported as. If it might be useful to know: according to its metadata, the PDF appears to have been exported from AutoCAD. There are two types of lines: 7m and 2m intervals, which are the same color, but have different weights (the 7m contour lines are twice the weight of the 2m contour lines). The contour lines are able to be viewed as paths in Adobe Illustrator. I am looking to create 3D terrain from a contour map that I have (originally inside a PDF).
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