Thanks :) it works !string ParamID = "0x003"; // this string tells 3ds Max to use the DXSAS compilerfloat3 colorB< string UIName = "Color 1"; string UIWidget = "color";> = {0.9f, 0.7f, 0.4f};float3 colorA< string UIName = "Color 2"; string UIWidget = "color";> = {0.7f, 0.5f, 0.5f};float4x4 wvp : WorldViewProjection <…