According to my experiences before, there is something troublesome and inconvenient in lighting design of 3D animation making. As pictures of three-dimensional animation are rendered out by computer calculation. In order to obtain a satisfied effect, so many parameters need to be constantly adjusted and a lot of rendering tests are performed, which would obvioulsy consume a lot of time and resources. Especially the final render, it would greatly degrade the efficiency of the whole film making. So It is a major task to reduce the time for rendering as possible as I can.
However, the lighting set is one of the primary elements influncing the rendering efficiency. Generally speaking, the lighting illumination could be divided into traditional triangle illumination and high-level illumination which includes Global Illumination as well as Final Gathering. Global Illumination is through launching photons to imitate the real lighting effect in the world. Such an illumination is a killer for render time as there exists both the refraction and the secondary reflection between the surfaces of objects which would spend a lot of system resources on calculating. Moreover the more numbers of photons, the better effect and the lower efficiency. Apparently, It will take a computer much more time to calculate and to render if you want to use Global Illumination in order to get an ideal lighting effect. Whereas the traditional triangle illumination can hardly obtain such satisfactory effect. How to balance them is what I will focus on in current animation..
" The Ice Age" produced by 20th Century Fox was a good example which has well solved such a problem. The makers got rid of the restriction of high-level illumination, using conventional illumination way created a real and slightly exaggerated effects, which saved lots of time from rendering and made the film lifesome and dynamic. How they could create such a gorgeous lighting effect by the conventional illumination? In my opinion, to obtain a comfortable visual effect on lighting, most importantly, we have to follow the lighting laws of nature. Animation is a piece of artwork and computer technology is just a tool to achieve. So firstly it is necessary for me to improve aesthetic standard and the master the theory of art. I can treat the lighting design as making a color painting. I will use the Global Illumination as the foundation, but less number of photons. Then to take advantages of complementary color, contrast of warm and cool color tone, create the light one by one according to the art knowledge under the Triangle illumination. According to David Hays( 1989), the book of "Light on the Subject," Colors, like people, will seem different depending on their companions. Clear will seem warm if the other side of the face is hit by cool, or if the background is cool. Clear light may seem cool if its surround is warm." Setting the color and modulating the light intensity step by step is just like painting harmonic color little by little on the canvas. However It will not waste too much time acquire desired effect even though many lights are used. Of course this is just a theory of my analysis and I need a lot of tests to Identify.
The lighting design in Three- Dimensional also has so many advantages over that in the realistic movie. First of all, the intensity of light can be infinitely magnified and reduced. It also could be set to negative number which does not have the lighting object function but can obsorb the light. Second, the brightness of light could be only related with the light position, which has nothing to do with the distance between light and object. Moreover it is flexible that can be set to identify which object need to be light up and which need not. Forth, you can choose whether open the shadow choice, even its shade and color. Most important, object also has the choice whether accept the shadow of other objects. Finally, it could not only simulate realistic lighting effects in reality but also imitate the effects which is not existing in the real world.
Through such a task, it will bring my lighting design and animation making to a new level and high efficiency. Finally I can use light more flexibly and more technically to well express movie themes and my ideas.
Reference:
Heys, D. (1989). Light on the subject. The United States: Proscenium Publishers Inc.
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