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"3D Decals" for roads on terrain.

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Hello! I'm not sure if this is the right place since i'm new to the forums. I'm creating a simple "City creator" right now, and, obviously, i need to create a Road tool for it. I was planning on doing raytracing to make the road snap to the terrain geometry, but it would clip through the terrain in places with mountains or different heights. I don't want to make a simple 2D decal because it would not look good without shape(The sidewalk is of course going to be taller and have a different geometry than the road itself) and i want to make it "bendable". I'm not the best at maths and geometry manipulation so i don't know where to start... I'm using Unity by the way, and sorry for my bad English!

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