3D Textures on Android?

Unity Engine
1

Hey Everyone,

I’m running into issues trying to get 3D Textures working on Android. Pink (error) materials are appearing on objects that are using this shader.

Below is the 3D Texture shader. This works fine in windows builds and in the editor. But not with Android.

Please let me know if you need any more information. My hunch is that Android doesn’t support 3D textures. (Unity - Manual: 3D textures) Though, I’ve tried searching for proof and cannot seem to find anything. I’m no Android / OpenGL / Shader whizz so I may be missing something simple!

Is there any reason the below shader wouldn’t work on Android?

Thanks in advance,
Harrison

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

Shader "Unlit/_3DTextureTest_Trans"
{
    Properties
    {
        _MainTex("Texture", 3D) = "white" {}
        _Alpha("Alpha", Range(0, 1)) = 0.2
       
    }
        SubShader
    {
        Tags{ "Queue" = "Transparent" "RenderType" = "Transparent" }
        ZWrite Off
        Blend SrcAlpha OneMinusSrcAlpha
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                UNITY_FOG_COORDS(1)
                float4 vertex : SV_POSITION;
                float3 wpos : TEXCOORD1;
            };

            sampler3D _MainTex;
            float4 _MainTex_ST;
            float _Alpha;

            v2f vert(appdata v)
            {
               
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
                o.wpos = worldPos;
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                // sample the texture
                float3 texcoord = i.wpos.xzy;
                //texcoord.xy = texcoord.yx;
                texcoord.z += 1.5f;
                texcoord.z = texcoord.z / (3*3);

                texcoord.x /= 13.6875;
                texcoord.y /= 10;

                texcoord.x /= 30;
                texcoord.y /= 30;

                fixed4 col = tex3D(_MainTex, texcoord  );

                if (texcoord.x > 1)
                    col = float4(0, 0, 0, 1);
                if (texcoord.x < 0)
                    col = float4(0, 0, 0, 1);

                if (texcoord.y > 1)
                    col = float4(0, 0, 0, 1);
                if (texcoord.y < 0)
                    col = float4(0, 0, 0, 1);

                col.a = _Alpha;

                // apply fog
                UNITY_APPLY_FOG(i.fogCoord, col);
                return col;
        }
    ENDCG
}
    }
}
2

Hi!

Android devices running OpenGL ES 3 should support 3D textures, as well as ES 2 devices with an GL_OES_texture_3D extension.

Check the device logs, they should contain the actual reason.

3

Hey aleksandrk,

Thanks for getting back so quickly. I’ve made an empty project with just a cube, material, and the shader. It works on Android! Probably should have tried that first… I’ll have to do some more digging in the actual application. Annoyingly, the device logs aren’t printing anything useful.

Thanks again!

EDIT:

It’s working! I had to change Graphics API levels! Thanks so much!