I’m rewrote the OP to reflect what this thread has been through. 5.9.2017
How many people need Spline Decals?
Almost everyone. It’s the most wanted feature by the UE4 community. Check out the link below!
Why people need spline decals:
It saves everyone tremendous amount of manual work and tweaking, it can also be used for many different purposes. We’ve also done a comparison between Spline Decals and the current Landscape Spline Tool.
Example of Spline Decal in Cryengine:
https://www.youtube.com/watch?v=Tb60V05bg1U And documentation http://docs.cryengine.com/display/SDKDOC2/The+Road+Tool
What features would it benefit from:
1. Blocking Grass Tool from distributing meshes within the spline width.
**2. **Remove painted foliage that are within the spline width.
3. Displacement. With spline decals supporting displacement mapping (overriding landscape’s displacement map) we can make non-destructive changes to landscape if/when landscape uses tessellation and displacement mapping. If displacement mapping on spline decals come true, it opens the doors for many more uses on landscape besides projecting a material on a surface. (This is more important than the other 2). Spline Displacement should support collision (or better say landscape collision should update to cover the deformation caused by spline displacement) otherwise we’d go through the raised/lowered areas.