Arrow Group Industries LM86 Manual do Utilizador descarregar pdf (Página 47)

Maxwell Render 2.5 User Manual

Chapter 9. The core rendering application | 47

• Color Space: Choose your desired color space for the rendered image. Available

color spaces are sRGB, Adobe 98, Apple, APL and NTSC.

• Burn: Parameter to control the highlights in a render. Lower burn values will decrease

the intensity of the highlights to avoid “burned out” areas in the image. In most cases

this parameter should be left at default. Lowering it too much may produce unnatural-

looking images.

• Monitor Gamma: Maxwell Render™ internally uses a gamma of 2.2 to convert

from spectral space to RGB space. You can use this parameter to control the gamma

conversion. Lower gamma values darken the image, higher values lighten the image.

Note that you can control this parameter interactively while rendering incore rendering

application.

9.03.03 MXI

These parameters should be used when converting a low dynamic range image into a

MXI to use it as an Image Emitter in your scenes. It is recommended to use the ISO/

Shutterspeed settings instead to control the exposure of the image when rendering.

• Intensity: Intensity of the emission map. Raise this parameter to brighten the image,

which will then emit more light when used as an Image Emitter.

9.03.04 SimuLens™

The SimuLens™ system mimics certain optical effects found in all camera lenses. They can

add more realism to your renders.

F.01 Aperture 5 blades F.02 Obstacle dust F.03 Obstacle Fingerprint

Diffraction effects occur when light goes through small holes, causing interference patterns

in the shape of the lens aperture. Light will always cause slight interference patterns

because of the optical components used, causing the visual “artifact” known as glare. The

diffraction effect can also be applied to HDR images. Simply load a HDRI using the File>

Load Image option and apply diffraction to it.

• Aperture Map: The shape of the diaphragm will model the pattern of light that

reaches the lm. For example, a circular diaphragm will create circular patterns; a

hexagonal diaphragm will create 6 light streaks. You can set the diaphragm shape

using a black & white or color map called the aperture map.

• Obstacle Map: Water drops, eyelashes or dirt on the camera lens will also cause

diffraction effects. A black & white map called the obstacle map is needed. If you do

not want to use an obstacle map, you can leave this path blank: you only need an

aperture map for diffraction to work. However, if you do want to use an obstacle map,

be aware that it is necessary to load an aperture map too.

• Diffraction: Control diffraction/ glare intensity.

• Frequency: Control the frequency of coloring in the diffraction effect. Higher values

will make the patterns denser.

The obstacle map and the aperture map must have the same resolution. Your render and

the maps used do not always need to have the same resolution, but the more similar they

are in resolution, the less diffraction distortion you will get. The aperture map should be

black with white specifying the shape and size of the aperture. The obstacle map should

be white with black areas specifying dirt or scratches on the lens surface.

• Scattering: Commonly known as bloom, scattering occurs when the light is scattered

inside the lens before reaching the lm.

Please note that the Diffraction and Scattering effects will be more visible the stronger

the light source is. For example, if the camera sees the sun or a strong emitter, these will

have a stronger diffraction/ scattering effect. The diffraction/ scattering effects will still be

visible in the scene even if no direct light sources are seen by the camera, but the effect will

be weaker.

Tip: Do not enable any Simulens setting before starting the render as these settings

need to be calculated for each image update in the main render window. This will add extra

render time and also increase RAM usage during rendering, especially for high resolution

renders. Instead, wait until the render has reached an acceptable SL for viewing the

Simulens effect, stop the render, apply a Simulens effect to give you an idea of its inuence,

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