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Maxwell Render 2.5 User Manual

Chapter 8. Setting up the render output | 35

• Channels: Allow you to determine whether you want your channels to

be exported as independent les (Separate), or embedded as one single

le (Embedded) in the formats that allow extra buffers, like exr or tif.

The Alpha channel can be embedded in the tga, png, tiff and exr formats.

• Render: Output the main render image. You can choose between three main render

types:

• Diffuse+Reections: Which is the usual complete render. Output the whole

render including diffuse and reections.

• Diffuse: Output an image containing only the diffuse color of the surfaces.

• Reection: Output an image containing only the reective component of the

surfaces.

• Alpha: Output the alpha channel. The alpha channel is a black & white image

containing information about where a specic object exists and where it does not. It

is useful as a clipping mask when you want to isolate an object and composite it with

another object (for example: clipping a car render and pasting it over a photograph).

It is also possible to render a completely white alpha for transparent objects with the

Opaque option. If this option is unchecked, transparent materials will render with a

transparent alpha.

• Z-buffer: Output an image representing scene depth within the two values specied

in the Z-buffer range. The range is in meters. For common usage, you should specify

the range from the camera to the farthest object in your scene. This is useful to create

a depth of eld effect as a post process in an image editor that can use a Z-buffer

image to extract depth info.

• Shadow: Output a shadow channel. This channel is a grayscale image that

represents the shadows received by objects that have a material applied to them

with the “Shadow” option turned on. This is useful to composite the shadows cast

by a rendered object into a photograph. The “Shadow” option must be enabled for

the desired shadow-catching material. This can be done in the Material Editor of the

specic material (see chapter 10 about Materials).

If the Multilight feature is enabled, Maxwell exports all the shadow buffers corresponding

to each individual light emitter separately during the same render process, as well as

a shadow pass of all the shadows cast by each emitter “blended” together, giving an

extraordinary control over the compositing during the post-production process. For example

you can change the brightness of an emitter using MultiLight which could then brighten

up the shadow cast by another emitter. The blended shadow pass image will take these

changes into account..

• Material ID: Output multicolored material silhouettes. This is useful for easier

selections in a 2D image editor when you want to edit only specic materials in the

rendered image.

• Object ID: Output multicolored object silhouettes. This is useful for easier selections

in a 2D image editor when you want to edit only specic objects in the rendered

image.

• Motion Vector: Output the x,y,z translation of each pixel. Useful to apply motion

blur in compositing as a post process.

• Roughness: Output an image containing the Roughness value of the materials in the

scene. High Roughness materials will appear white in the image, while low Roughness

materials will appear dark.

• Fresnel: Output an image containing the Fresnel information of the surfaces.

During the render, you can display the specic render channels that you’ve

requested by hovering over the channel buttons in the render view.

The icons represent:

R: Render channel

A: Alpha channel

S: Shadow channel

M: Material Id channel

O: Object Id channel

M: Motion vector channel

Z: Depth channel

R: Roughness channel

F: Fresnel channel

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