Particles shader struggling

Hello,

I'm having some problems with a particles shader.
I just would like to extend a quad relative to the uv mapping.
So if the uv.v of the vertex is 0 no offset is added, if it's 1 then add an offset that I set externally.
I actually achieved the result on a non particles mesh.
But when I apply the shader to a particles seems like he coordinates space change.
And actually I read that the vertex position in Particles is worldSpace.

https://forum.unity.com/threads/particle-world-space-coords.82640/

So how can I achieve this on particle shader?

This is done my vertex shader.

Code (CSharp):

1.  
2. float uvV = v.uv.y;
3. //(x >= y) ? 1 : 0
4. //step(y,x)
5. int isFarEdge = step(0.9, uvV);
6.  
7. float zlerp = lerp(v.vertex.z _ZAdd, isFarEdge);
8. v.vertex.z = zlerp ;
9. o.vertex = UnityObjectToClipPos(v.vertex);
10.  

 

Line 7 looks wrong... you're not actually doing any math.

 

I actually missed a comma on that line.
But the principle is the same, if isfaredge is 1 then z.lerp is zAdd
otherwise zlerp is always v.vertex
Am I wrong?

 

I just opened the scene with an old Unity version , and the result is correct.
Something is changed in Unity 2017 but I can't understand what exactly.

 

Yeah something is still ocasionaly wrong with HLSL. Just last week it wouldn't let me use

Code (CSharp):

1. asuint( floatVar )

so I could check for NaN. Had to do some messy stuff like

Code (CSharp):

1. return floatVar == sqrt(-1);

(Don't ask why NaN check was written the way it was. Error was thrown in a script that unity documentation pointed to)

 

So, because your particles are batched, you're lerping those verts from whatever position they are at to a fixed number...

I assumed from you saying "offset" you wanted something like:

Code (csharp):

1. float zlerp = lerp(v.vertex.z, v.vertex.z + _ZAdd, isFarEdge);