Demo 53 - Vertex color depending ID

Shader "Custom/VertexID"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Val ("Value 1", Range(1, 50)) = 2
        _Val2 ("Value 2", Range(1, 50)) = 7
        _Val3 ("Value 3", Range(1, 50)) = 5
        _Color1 ("Color 1", Color) = (1, 1, 1, 1)
        _Color2 ("Color 2", Color) = (1, 1, 1, 1)
        _Color3 ("Color 3", Color) = (1, 1, 1, 1)
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

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

            struct v2f {
                float4 pos : SV_POSITION;
                float2 uv : TEXCOORD0;
                fixed4 col : COLOR0;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float _Val;
            float _Val2;
            float _Val3;
            fixed4 _Color1;
            fixed4 _Color2;
            fixed4 _Color3;

            v2f vert(appdata_base v, uint id : SV_VERTEXID) {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
                o.col = fixed4(1, 1, 1, 1);
                if(fmod(id, floor(_Val)) == 0)
                    o.col *= _Color1;

                if(fmod(id, floor(_Val2)) == 0)
                    o.col *= _Color2;

                if(fmod(id, floor(_Val3)) == 0)
                    o.col *= _Color3;

                return o;
            }

            fixed4 frag(v2f i) : SV_Target {
                fixed4 col = tex2D(_MainTex, i.uv);
                return i.col * col;
            }

            ENDCG
        }
    }
}