Texture on one face of a cube

Questions & Answers
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1

Hey everyone,

I'm trying to figure out how to texture one side of a cube. I first tried to make the cube really thin and did a transparent diffuse on it but occasionally you can see pixels on other sides.

Also, is there a better easy way to get the illusion of an animated 2D Sprite than putting the animated texture on the side of a cube?

thanks!

4

No point in "faking" a sprite with a cube. Just use a plane instead. It only has one polygon.

2

UV map the cube the way you want in a 3D app. For a sprite, it would be better to put it on a quad, either made procedurally or in a 3D app.

3

Get a 3D application, like 3Ds Max, Blender for free.

UV map it (www.google.com), and then you want to apply the texture as the UV map... Then you can alter it that way.

5

What about adding quad/plane inside of cube, set the position and texture it?

6

This shader will work for this

Shader "Custom/CubeSurfaceShader"
{
 Properties {
        _MainTex ("Texture", 2D) = "white" {}
        _Face1 ("Face 1", 2D) = "black" {}
        _Face2 ("Face 2", 2D) = "black" {}
        _Face3 ("Face 3", 2D) = "white" {}
        _Face4 ("Face 4", 2D) = "white" {}
        _Face5 ("Face 5", 2D) = "white" {}   
        _Face6 ("Face 6", 2D) = "white" {}
        _BorderSizeF1 ("Border Size Face 1", Range(0, 0.5)) = 0
        _BorderSizeF2 ("Border Size Face 2", Range(0, 0.5)) = 0
        _BorderSizeF3 ("Border Size Face 3", Range(0, 0.5)) = 0.03
        _BorderSizeF4 ("Border Size Face 4", Range(0, 0.5)) = 0
    }

    SubShader {
        Tags {"RenderType"="Opaque"}
        LOD 100

        Pass {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            struct appdata {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
                float2 uv : TEXCOORD0;
            };

            struct v2f {
                float2 uv : TEXCOORD0;
                float3 normal : TEXCOORD1;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            sampler2D _Face1;
            sampler2D _Face2;
            sampler2D _Face3;
            sampler2D _Face4;
            sampler2D _Face5;
            sampler2D _Face6;
            float _BorderSizeF1;
            float _BorderSizeF2;
            float _BorderSizeF3;
            float _BorderSizeF4;

            v2f vert (appdata v) {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.normal = v.normal;
                return o;
            }

            float4 _MainTex_ST;

            float4 frag (v2f i) : SV_Target {
                float4 col;
                if(i.normal.z > 0.999) {
                if(i.uv.x > (1.0 - _BorderSizeF1) || i.uv.x < _BorderSizeF1 || i.uv.y > (1.0 - _BorderSizeF1) || i.uv.y < _BorderSizeF1)
                    col = float4(0,0,0,1);
                else
                    col = tex2D(_Face1, i.uv);
            }
            else if(i.normal.z < -0.999) {
                 //flipping face 3 texture so that it is orientated the same as sides 1,2&4
                float2 uv = i.uv; 
                uv.x = 1.0 - uv.x; //flip texture in the X
                uv.y = 1.0 - uv.y; //flip texture in the Y
                if(i.uv.x > (1.0 - _BorderSizeF3) || i.uv.x < _BorderSizeF3 || i.uv.y > (1.0 - _BorderSizeF3) || i.uv.y < _BorderSizeF3)
                    col = float4(0,0,0,1);
                else
                    col = tex2D(_Face3, uv);
            }
            else if(i.normal.x > 0.999) {
                if(i.uv.x > (1.0 - _BorderSizeF2) || i.uv.x < _BorderSizeF2 || i.uv.y > (1.0 - _BorderSizeF2) || i.uv.y < _BorderSizeF2)
                    col = float4(0,0,0,1);
                else
                    col = tex2D(_Face2, i.uv);
            }
            else if(i.normal.x < -0.999) {
                if(i.uv.x > (1.0 - _BorderSizeF4) || i.uv.x < _BorderSizeF4 || i.uv.y > (1.0 - _BorderSizeF4) || i.uv.y < _BorderSizeF4)
                    col = float4(0,0,0,1);
                else
                    col = tex2D(_Face4, i.uv);
            }
            else if(i.normal.y > 0.999) col = tex2D(_Face5, i.uv);
            else if(i.normal.y < -0.999) col = tex2D(_Face6, i.uv);
            else col = tex2D(_MainTex, i.uv);
                
                return col;
            }
        ENDCG
        }
    }
    FallBack "Diffuse"
}