Lighting Ratio Tutorials

Lighting Ratio Examples

As we've seen, lighting ratio is the ratio between the strength power in the brightness of the key main light and the fill light. Since light originates from a source and gets bounced off surfaces, it naturally produces lighting ratios. Lighting ratios in 3D are easier to achieve than in the real world, since 3D programs have either a percentage setting or an intensity or multiplier setting for lights. The following tutorials will illustrate the use of lighting ratios in LightWave, 3D Studio...

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Shadow Casting Local Light

lt J lDi tdcB Tt' j 7 Ii 7 X lt y Figure Placement of the omni light that simulates the architect lamp's indirect wall I BiH illumination. Click Exclude and exclude the Floor object from both Illumination and Shadow Attenuation Parameters Decay Type Inverse Square Start 2.5 and Click Show, Use Shadow Map. Color Black Dens 0.25 Click Light Affects Shadow Color. The next step is to simulate the carpet floor light reflection. This is simulated with a spotlight that is positioned below the floor...

Shiny Nonmetal Reflectors

Back Light Shinny

We are all fascinated by glossy and reflective surfaces because of the movement of the reflected environment on their surfaces. Because such objects reflect their surroundings, it is not always easy to light glossy or shiny objects. Reflective objects are hard to light so that their own form and shape will be seen. This is especially tricky with light or dark back- Reflective objects are not forgiving when it comes to improper lighting, which hides them, not emphasizes them. Reflective surfaces...

The Inverse Square

Inverse Suare

Since light is a part of the electromagnetic spectrum, it is nothing but the emission of energy as it is transferred around and seeks a lower, more stable stage. Maxwell accounted for the existence of heat as nothing but radiation that we cannot see but only feel. Our eyes are not sensitive enough to see the extreme far red called infrared. When you approach a light source, it gets hotter as you get closer and cooler as you increase the distance. You will notice that the rate of its warmth or...

The H and D Curve

Density Plotted And Curve

Film cannot possibly capture all the tones present in a scene, especially if the scene is taking place on a bright, sunny day. Films have a limited ability to capture different light levels. In short, film has a dynamic range. This means there is a limit to the range of brightness film can record, that there is a maximum as well as minimum illumination it can capture. Have you ever overexposed or underexposed a frame of film Most likely, you have done so using a flash or under a bright sun or...

Light Meters and Eighteen Percent Gray

In talking to photographers, you often hear the phrase 18 percent gray. This is the kind of gray that a Kodak gray card gives, as well as the tonality you get if you follow the indications on your camera's light meter when you expose a pure white wall. It means that 18 percent of the light striking an object is reflected. Eighteen-percent gray is roughly the tonality you get when you mix equal amounts of white paint and black paint. In short, most light meters, especially light meters built...

Shadow Formation

Shadow Formation

Light interacts with almost any object. It bends, is reflected, or is transmitted. Most light either passes through objects or is reflected. However, when an object obstructs the light and does not let it pass through partially or totally, it creates a shadow, A shadow is defined as the area in which there is partial or total absence of illumination due to an obstruction between the light source and the area of illumination. As you know, shadows are not uniform in shape, form, or quality....