Hack to get up to 15 dynamicly changing colors in a single PicaVoxel model

gistfile1.shader

           VertexOutput vert (VertexInput v) {
                VertexOutput o = (VertexOutput)0;
                o.uv1 = v.texcoord1;
                o.uv2 = v.texcoord2;
				float4 color = v.vertexColor;
				uint index = ceil(color.a * 15);
				if (index < 15) {
					color = _ColorReplace[index];
				}
				o.vertexColor = color; //  v.vertexColor;
                #ifdef LIGHTMAP_ON
                    o.ambientOrLightmapUV.xy = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
                    o.ambientOrLightmapUV.zw = 0;
                #elif UNITY_SHOULD_SAMPLE_SH
                #endif
                #ifdef DYNAMICLIGHTMAP_ON
                    o.ambientOrLightmapUV.zw = v.texcoord2.xy * unity_DynamicLightmapST.xy + unity_DynamicLightmapST.zw;
                #endif
                o.normalDir = UnityObjectToWorldNormal(v.normal);
                o.tangentDir = normalize( mul( unity_ObjectToWorld, float4( v.tangent.xyz, 0.0 ) ).xyz );
                o.bitangentDir = normalize(cross(o.normalDir, o.tangentDir) * v.tangent.w);
                o.posWorld = mul(unity_ObjectToWorld, v.vertex);
                float3 lightColor = _LightColor0.rgb;
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex );
                UNITY_TRANSFER_FOG(o,o.pos);
                TRANSFER_VERTEX_TO_FRAGMENT(o)
                return o;
            }