Question by birdwest · Apr 10, 2018 at 10:52 AM · shader depth

Writing depth value in shader but nothing happens

Hey Guys, I really need your help.

I'm trying to change the depth values of gameObjects so that images from webcam can occlude virtual objects alt text I'm doing this by changing the depth values in the fragment shader according to a depth camera. (depth data is stored in the texture's alpha)

fout frag(v2f i) {

     fout fo;
     fo.color = float4(tex2D(_MainTex, i.uv).rgb, 1);
     //2000 = far plane; 0.05 = near plane
     fo.depth = ((1 / (1 - tex2D(_MainTex,i.uv).a)) - 2000 / 0.5) / (1 - 2000 / 0.5);
     if (fo.depth > 0.9999999)
     {
         fo.depth = 0.9999999;
     }        
     return fo;
 }

it works pretty well in Unity 5.4.3 but when i change to Unity 2017.3.0f3, this method just doesn't work. alt text No matter where i place my cubes, it just won't appear in front of the image