New to Blender here! I'm trying to build a rudimentary race track with Blender 2.79b which currently consists in:

  • a square plane subdivided n times to create a terrain which will have bumps
  • a track modeled using Array and Curve modifiers that fit to a Bezier curve.

What I'd like to achieve is merging the two planes so that:

  • the track will be correctly rendered
  • sculpting the terrain will affect the surrounding track

However, I may be going in the wrong direction trying to do this, so I'm grateful for any proposal that is better practice!

Wireframe planes Material rendering


Hi Zim in this case its best to use the ShrinkWrap or KnifeProject. The 1st one is more simple to use so thats what we try. I prepared the scene looking like this:

enter image description here

You could see the road above the terrain so now its good to make the road subdivided (preferably more that the terrain) for ShrinkWrap being possible so use Subdivide to achieve this result:

enter image description here

Its enough to acomplish what we want so now the modifier takes place. Add it and as a target choose the terrain object (in my case its "Plane"). Now use the settings as below (GREEN). As a MODE use the Project and dont forgot to check the Negative projection (in our case we have road above the surface so its negative). Also dont forget to set the Offset to about 0.01 (lets try lowest value possible) to avoid overlapping faces.

enter image description here

Everything is done so hope it helps Buddy.

Sincerely, Jan

  • $\begingroup$ Hi Jan thanks for your answer which gives a satisfying result, but this does not help regarding my second expectation (sculpting the terrain will affect the surrounding track): sculpting a bump next to a curve will sculpt over the track... I don't know if it's ever possible so I ended up drawing the track directly on the ground texture in an image editor. (upvoting anyway :) $\endgroup$ – Zim Nov 17 '18 at 10:08
  • $\begingroup$ Hi Zim it sound like a "glitch" cause it does not matter if You sculpt the terrain the road should be above it no matter what so please share the blend file here so I could look. $\endgroup$ – Jan Matys Nov 19 '18 at 20:00
  • $\begingroup$ Here it is: s000.tinyupload.com/index.php?file_id=28872486417056360452 (edit: reuploaded without textures) $\endgroup$ – Zim Nov 20 '18 at 8:54
  • $\begingroup$ blend-exchange.giantcowfilms.com/b/5525 ... problem SOLVED ;). The reason for the error was that You did not subdivide the basic mesh as I mentioned in the step 2 of my answer. Explore the file and especially the ROAD modifiers and settings. $\endgroup$ – Jan Matys Nov 20 '18 at 15:23
  • $\begingroup$ Awesome! Thank you very much for you help Jan :) The terrain sculpting is very slow on my computer but it behaves exactly as I wish! $\endgroup$ – Zim Nov 20 '18 at 17:31

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