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I'm modeling a specific hill. I have a topographical map of the hill and wish to plot the 1 meter height contour lines accurately. What's the best way to do this?

I cannot find a tutorial like this on Blender, but found one for 3ds Max: https://www.youtube.com/watch?v=EVuY3dBYQfk (from 1:55).

The image below shows a model I made in sketchup; I created a plane, drew in the squiggly lines with its freehand line tool, then extrude.

enter image description here

enter image description here

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Assuming your landscape is a mesh, you may try the following:

  1. add a plane a little bigger than your landscape, and at the base (or lower than) of landscape
  2. with plane selected, and under "modifier tab", you add an "array" modifier. You set to constant offset, X and Y to 0, Z to a distance that suits your needs, and you should increase the count to get as much planes as you need to cover the top (or pass a bit) of your landscape). If your landscape is in "real" scale, you can set the Z to 10m, to get the 10m isocontours.
  3. with plane selected, under "boolean" you set to "intersect" with the landscape
  4. apply your modifiers to the plane (you will have horizontal planes by choosen iso Z value)
  5. press "space", write "convert to" and select "curve from mesh/text" (you will convert the planes to lines, to get their perimeter - if you need, you can then increase thickness of lines, etc)
  6. optional step if you want to control the material (colours, etc) of your contours: you again "convert to" "mesh from curve/text"

Following the exact steps mentioned above you get the following result:

enter image description here enter image description here

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  • $\begingroup$ Thanks for your help. I'm new to Blender; I followed your instructions up to 3 and am a bit lost. How did you get the contour lines in? Is there a tool where I can draw them in? Because I need to trace them off an image file (jpg, png, etc). I added another image above to show how I did that big model in Sketchup; not sure if Blender has the same modeling process though. $\endgroup$ – Silk Mar 28 '20 at 7:27
  • $\begingroup$ considering your new information you can add "curves" than draw them along the isocontours. Then press "G", then "Z", to grab and move on Z axis, then you type how much you want to move (example: G then Z then 10m). When all iscontours are drawn, you select them all, and join them into a single object. Then you triangulate the surface. This way, in my opinion is not the most suitable. You should trace the isocontours on QGIS, assign a Z value for each, then export to obj, or directly in QGIS build the DTM. Follow the next instructions: makoj.com/blog/2018/april/contours-dem $\endgroup$ – MCunha Mar 28 '20 at 9:34
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I am not expert, but seeing your detailed layers of planes extruding little by little like that, and they are not connecting to each other, I think you can use Bezier Curve, and add extrude to the Geometry tab. Or you can convert the curve into mesh and extrude them. For exact dimension of 1m, by default Blender is using meter, so 1 unit of Blender is 1 meter, check Scene Properties > Units.

So, this is simplified example from what I understand to what you want: Example terrain layers with extruded bezier curve The dimension is accessed from 3D View, press N to toggle show/hide it.

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