Unity 5 Fade Render mode Sort Order issue

Hi there,

I'm having some ugly sort order problems with the render Fade mode in the unity 5 standard shader. When it is opaque I can see various interior faces related to sorting issues, but does still fade out completely. (Ive also tried Transparent, it has the same sorting issues)

I have some slightly fancy gears/cogs, that have centrally located sensible pivots that cant be changed. I dont have time to break the items up because of the time it would take, and eventual issues with draw calls given the volume and complexity of the scenes.

I have a old non pbr shader that I transitioned with my project from 4 that works fine, but I moved to 5 to push the visual quality forward.

If anyone can help I'd be very grateful, if an old shader can do it I'd really hoped that the new ones would cope fine.

Apologies if anyone else has had the same issue I cant find anyone posting with the same issue

 

I have the same issue - did you solve?

 

Yes please!

 

it try with this script:

var myMaterial = GetComponent.<Renderer>().material;
function Start () {
myMaterial.SetInt("_ZWrite", 1);
}
function Update () {
}

But i still get trasparency not work with DOF.
How to have a standard shader (transparent) to work correct with DOF ?
Please i realy need it.
Thank you

 

ok, i have the same problem. if i set a shader transparent with cull off zwrite off, the effect looks good, i can see both side of the translucent object, but if there is an opaque object inside, there is a sorting problem. if i set zwrite on, there is no sortorder problem but i cant see the backfaces of the translucent object. it was working perfectly with 4x shading. could we have it back as a legacy option?

 

i know the legacy shaders are there, i was more talking about the old way of alpha shading in custom surface shaders. sadly i've udated all my old files but in u4x when i had this very same shader with #pragma surface surf Lambert alpha, if i put an opaque object inside a semitransparent and i set the alpha to 100%, then the semitransparent object completely covered the opaque, but if i pushed the alpha down, looking through the semitransparent object i saw both the front and backside of it as well as the opaque object inside. now if i push the alpha on the transparent object to 100% i can still see the opaque object inside (just its edges, but still, it can be seen). if i try to solve it with zwrite on, then this problem goes away, but in exchange i cant see the effects on the backside of the transparent object :/

this is how it looks now with alpha:fade cull and zwrite off.

 

how would this be correct? a transparent object with 100% alpha should be opaque and whatever is inside or behind shouldnt be visible... and thats how it was working in u4x and it wasnt visible behind other objects

 

Hi UnityGuillaume,

Thanks for the reply. We've added Zwrite into the shader, it seems to work fine for how I need it! Thanks!

 

Is it possible to have the Standard shader render a non-convex Combined Mesh with 5 materials in Fade mode with ZWrite 1 and not see any overdraw in that combined mesh, but only the faces that would render in Opaque mode? I have tried this by setting the mode to Fade for all 5 materials and then setting _ZWrite 1 for all 5 materials, but I am seeing faces that should be hidden by faces on the same object that are closer to the camera.

Do I need to alter the Standard shader to do a ZWrite pass before all the other passes, for this effect, as in Shader "Transparent/Diffuse ZWrite" on Unity/Editor/Data/Documentation/en/Manual/SL-CullAndDepth.html?

 

I tried the "Transparent/Diffuse ZWrite" shader, and it has the same problem of showing faces that should be hidden by faces closer to the camera, at least with a Combined Mesh and multiple materials.

What's the simplest way to have all the materials do a z write on all faces of a Combined Mesh? Or, is there is another technique that could render the same faces as the Opaque Standard shader, but be transparent with respect to other objects behind it in the scene?

 

I ran into a similar issue, as all of the above. The only way I was able to get the results I wanted, was to modify the standard shader to have ZWrite On in the Base forward pass, set the Material to Opaque in the editor, and then manually change the material of the objects I wanted like so:

Code (csharp):

1.  
2. ZWrite On ZTest LEqual
3.  

Code (csharp):

1.  
2. Material mat = (UseSharedMaterial ? r.sharedMaterial : r.material);
3. mat.SetFloat("_Mode", 2);
4. mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
5. mat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
6. mat.SetInt("_ZWrite", 0);
7. mat.DisableKeyword("_ALPHATEST_ON");
8. mat.EnableKeyword("_ALPHABLEND_ON");
9. mat.DisableKeyword("_ALPHAPREMULTIPLY_ON");
10. mat.renderQueue = 3000;
11.  

After I was done messing with the alpha, and wanted it to be opaque again, I reset it back:

Code (csharp):

1.  
2. mat.SetFloat("_Mode", 0);
3. mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
4. mat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
5. mat.SetInt("_ZWrite", 1);
6. mat.DisableKeyword("_ALPHATEST_ON");
7. mat.DisableKeyword("_ALPHABLEND_ON");
8. mat.DisableKeyword("_ALPHAPREMULTIPLY_ON");
9. mat.renderQueue = 2000;
10.  

The problem I was running into, is that if I put all the materials I wanted to Fade, then the object would fade, but leave a 'cut out' stencil of where it was in the other meshes.

By doing it like this, we're forcing the draw order of the faded objects only, so they are drawn 'on top of' the Opaque ones.

It's hacky, but like I said, it is the only thing that worked.

 

Do you have the full code for that shader?