shader
stToColor(   
    float s = 0 [[
                string widget = "null",
                int lockgeom = 0
                ]],
    float t = 0 [[
                string widget = "null",
                int lockgeom = 0
                ]],
    float blue = 0,
    output color resultRGB = 0 
            
    )
{
resultRGB = color(1, 0, blue);
}