HolisticColorVertexGradient.shader

Shader "Holistic/ColorVertexGradient"
{
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float4 color  : COLOR;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.color = 0;
                // for the 10x10 XZ plane 
                o.color.r = ( v.vertex.x + 5 ) / 10;
                o.color.g = ( v.vertex.z + 5 ) / 10;
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                return i.color;
            }
            ENDCG
        }
    }
}