Physic
Temperature
Specifies the main color temperature of the light sources. This is similar to white balance controls on digital cameras. For daylighting, a value of 6500 is recommended, for incandescent lighting, a value of 3700 is recommended. For example, photographs taken indoors might be lit by incandescent lights, which are relatively orange compared to daylight. Defining "white" as daylight will give unacceptable results when attempting to color-correct a photograph taken with incandescent lighting.
Midtones
Controls the level of the areas of the image whose brightness lies between the highlights and the shadows. Higher values yield brighter midtones, while lower values darken the midtones.
Saturation
When the upper part of the dynamic range becomes compressed it naturally loses some of it's former contrast, and one often desire to regain some "punch" in the image by using the crush blacks parameter. When 0, the lower intensity range is linear, but when raised towards 1, a strong to region is added to the transfer curve so that low intensities gets pushed more towards black, but in a gentle (soft) fashion.
Highlights (burn)
Burn highlights can be considered the parameter defining how much "over exposure" is allowed. As it is decreased from 1 towards 0, high intensities will be more and more "compressed" to lower intensities. When it is 0, the compression curve is asymptotic, i.e. an infinite input value maps to white output value, i.e. over-exposure is no longer possible. A good default value is 0.5.
Shadow
When the upper part of the dynamic range becomes compressed it naturally loses some of it's former contrast, and one often desire to regain some "punch" in the image by using the crush blacks parameter. When 0, the lower intensity range is linear, but when raised towards 1, a strong to region is added to the transfer curve so that low intensities gets pushed more towards black, but in a gentle (soft) fashion.
Vignetting
The vignetting parameter simulates this. When 0.0, it is off, and higher values cause stronger and stronger darkening around the edges. Note that this effect is based on the cosine of the angle with which the light ray would hit the film plane, and is hence affected by the field-of-view of the camera, and will not work at all for orthographic renderings. A good default is 3.0, which is similar to what a compact camera would generate.
Physical scale
Determines how 3ds Max Design calculates pixel values when outputting HDR (high-dynamic-range) images. You can use the physical scale inherent in the scene, or set an arbitrary physical scale for non-physically-based lighting situations.
delete BG overbright
Clicking this button will adjust the physical scale of the exposure. Can be used to avoid that vue or HDRI/OpemEXR images will not be over or under exposed.
Exposure BG
Click this button to turn on the exposure for the background.
Dropdownlist: Environment or Mode
Dropdownliste: In this menu you can choose the physical mode (Unit, Indoor, Outdoor, Outerspace).
