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How shading of the heightmap using DOT product

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if a direction light vector and has been calculated,How can ifinish the shading of the heightmap using DOT product (N.L)? light vector: float light[3]; float len; light[X] = mx - dimen/2; light[Y] = my - dimen/2; light[Z] = 150; len = sqrt( fabs( dot(light, light) ) ); light[X] /= len; light[Y] /= len; light[Z] /= len; noraml vector: float normal[dimen][dimen][3];

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