I’ve been googled for hours and haven’t found a solid solution to this problem.
See the attach. I have an arbitrary drawn polygonal object on the top of a curvy terrain (arbitrary = polygon’s vertices doesn’t match to terrain’s mesh vertices, and the size of the polygon is not rectangular). Now I want to apply a texture within this polygon on the terrain surface. How to do that?
Options I’ve read about:
- Create a mash with tiny y-offset. Terrain is curvy, so I need to follow the terrain heights very precisely. Doesn’t seem a right direction to my.
- Use terrain’s alphamap to draw a texture. Alphamap draws textures using heightmap resolution, thus I’ll get a square-ish shaped patch, while I want the texture exactly following the polygon shape.
- Use a Projector. That doesn’t seem working at all. Projector creates a shadow or light, it doesn’t project a full color texture.
- Use Decal shader. This shader returns a strange error
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Rendering.HighDefinition.DecalSystem+DecalSet.InitializeMaterialValues () (at Library/PackageCache/com.unity.render-pipelines.high-definition@7.3.1/Runtime/Material/Decal/DecalSystem.cs:373)… Plus it’s sounds a little odd having a projector on each polygon (there’ll be many of them in the game).
I imagine a shader that’s renders given texture in intersection of the polygon and the terrain. But I failed googling any examples of such shader. Any suggestions? Or maybe the pest solution is something else?
