This is easy to achieve by turning off global illumination set the Diffuse Depth and Specular Depth to zero (this essentially turns off all global illumination). If the issue is noise in a specular highlight, you will need to confirm that the source is the direct light and not a secondary ray type (such as specular). Specular roughness from top to bottom: 0, 0.1, 0.2, 0.3 If you are not used to working with exposure in the lights, you can simply leave the exposure parameter at its default value of 0 (since 2 0 = 1, the formula then simplifies to: color * intensity * 1). Also, working with exposure means you won't have to type in huge values like 10,000 in the intensity input if your lights have quadratic falloff (which they should). Other than that, this light parameter has nothing to do with a real camera's f-stop control. You may be asked by the director of photography (who is used to working with camera f-stop values) to increase or decrease a certain light by 'one-stop'. The reasoning behind this apparent redundancy is that, for some people, f-stops are a much more intuitive way of describing light brightness than raw intensity values, especially when you're directly matching values to a plate. You can get the same output by modifying either the intensity or the exposure. For example, intensity=1, exposure=4 is the same as intensity=16, exposure=0. In Arnold, the total intensity of the light is computed with the following formula:
Color temperature enabled overrides color texture mapĮxposure is an f-stop value that multiplies the intensity by 2 to the power of the f-stop. Increasing the exposure by 1 results in double the amount of light.
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