Control light intensity decay over distance.
- [Narrator] Arnold obeys physical laws,…but also gives us the freedom to art direct…the look of our lighting, using physical parameters,…just like a real cinematographer or photographer would.…Also, to a considerable extent we are…permitted to bend or break physical laws…to achieve our desired production goals.…In lighting, one of the primary concerns…is control over attenuation or light decay.…In physics, this is described…by the so called inverse square law.…
It states that a radiant energy source…will diminish in intensity, according…to the inverse square of the distance.…In Maya terms this is known as a Quadratic Decay.…In Arnold version five, point spot…area and mesh lights all use Quadratic Decay.…The decay rate setting that you may…be familiar with in the Maya light attributes is ignored.…Intensity curves do work correctly,…but the effect of the intensity curve…is combined with the Arnold decay.…
For physically accurate illumination…with omni directional light sources…then we need Quadratic Decay.…However, many lighting instruments…
AuthorAaron F. Ross
- Arnold rendering concepts
- Lighting with Maya and Arnold lights
- Controlling exposure
- Filtering light with Gobo
- Light attenuation with Decay
- Image-based lighting with Skydome
- Exterior daylight with Physical Sky
- Arnold Standard Surface material attributes
- Mapping material attributes
- Rendering refractions
- Mesh subdivision and displacement at render time
- Shading effects such as ambient occlusion and vertex color
- Camera effects such as fisheye and depth of field
- Animation image sequence rendering
Skill Level Intermediate
2. Studio Lighting
3. Natural and Environmental Lighting
4. Materials and Mapping
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