Controllable region via texture projection for stylized shading

Existing texture projection methods are capable to produce irregular gradation shading, but still can not provide region control for acquiring artistic styles such as multiple lights effects and more detailed shading by painting. We improved the capability of light space normal notion from [Todo et al. 2013] by adjusting the z component so that region control can be achieved. Our approach effectively helps artist create smooth multiple lighting effects with additional painting control while keeping the high quality shading of the texture projection method..