Extract H S and V seperately in matlab from an HSV image

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MatLab

image-processing

Hi I need to extract H s v from an HSV image in MATLAB So that i can convert it to a linear space.So far i have done this but it does not show a cone in the end instead it shows a cube.

colorLinear(1) = colorHsv(1);
colorLinear(2) = colorHsv(2);
colorLinear(3) = colorHsv(3);
a=colorHsv(2)*colorHsv(3)*cos(2*pi*colorHsv(1));
b=colorHsv(2)*colorHsv(3)*sin(2*pi*colorHsv(1));
c=colorHsv(3);

Thanks anyways