Blend at Edges of Cartographic Polygon

Cesium for Unreal
1

Hi,

Is it possible, and is there an example of how to create a blend at the edges of the cartographic polygon so that the transition between the manually built site and the Google-generated stuff is less harsh?

Thanks,

Aidan

Cesium_Polygon_Blend_Question
Cesium_Polygon_Blend_Question1046Ă—815 146 KB

2

I’m not aware of any way to do that. The cartographic polygon clipping works by using the “opacity mask” output of an Unreal Material, which only allows ON/OFF. Even if we could do alpha blending, I don’t think it would work very well here (and the usual depth ordering concerns with alpha blending geometry would apply). Your best bet - though I realize it’s a fair bit of work - might be to manually create a blend region, either as part of the manually built site or as a third model.

3

Thanks, Kevin!

4

Hi kevin. Did you find workaround for this?

5

There’s a way to do it.

Here’s the tutorial - https://www.artstation.com/blogs/immerse/YQNWN/cesium-for-unreal-smooth-blending-for-clipping-polygons.

If I recall correctly, this process didn’t work in my scenario because in my scene, a variety of materials are used across multiple objects, and this works best if you’re blending with a single Landscape Material.

2 Likes
6

This link works only for square/rectangle shape cartographic polygon. I have multiple raster overlays. Each raster overlay have multiple number of irregular shaped/size cartographic polygons. Is there a workaround to achieve it so that the edges should be fade for each one of them?

7

Not with the above solution. That’s something I was hoping for as well.

8

Hi aidnewsome. Any update regarding the problem?