Displacement/Tessellation Tearing/Cracks

Hey!

For Shader Forge users: This is a bug in Shader Forge, so it's not your fault! That being said, I have now fixed it in version 1.01 - update and see if it works :)

For shader coders: This issue appears when using a naive implementation of non-uniform tessellation factors. You have to make sure the tessellation factor is calculated for each vertex in every triangle, and then you average each pair to get the tessellation factor for each edge, and then average all three to get the center factor.

This is my solution:

 // Your per-vertex tessellation factor here
 float Tessellation(TessVertex v){
     return (64.0/distance(_WorldSpaceCameraPos,mul(_Object2World, v.vertex).rgb)); 
 }

 // Calc factors for all three edges + center
 float4 Tessellation(TessVertex v, TessVertex v1, TessVertex v2){
     float tv = Tessellation(v);
     float tv1 = Tessellation(v1);
     float tv2 = Tessellation(v2);
     return float4( tv1+tv2, tv2+tv, tv+tv1, tv+tv1+tv2 ) / float4(2,2,2,3);
 }

Hope it helps, and happy holidays :)

// Joachim

@Acegikmo I still seem to have this issue with 1.38v . Is there any particular setting i should be aware of?

Thanks

Daniel https://imgur.com/a/U7maW https://imgur.com/a/X5UnS