This page provides details about the Object Select Render Element and how it is used in compositing.
The Object Select Render Element stores only the object(s) called out with a specific Object or Material ID. This effect is reversible to create a render element that excludes a particular object or objects according to Object or Material ID. When rendering this element out using Raw mode, it also includes filter and alpha passes separately to help make it easier to use when compositing.
This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:
VRayVFB – When enabled, the render element appears in the V-Ray Virtual Frame Buffer.
Deep output – Specifies whether to include this render element in deep images.
Color mapping – Applies the color mapping options specified in the Color mapping rollout (Render Setup window > V-Ray tab) to this render element. This option is enabled by default.
Multiplier – Sets the overall intensity of the render element, where 1.0 is the standard multiplier.
Mode - Controls the way objects are clipped in the element.
Normal – Objects are clipped as you would normally see them in the RGB channel.
Raw – Three elements are created instead of one: an unpremultiplied RGB element with the object; a floating-point alpha element, and a RGB filter element (includes masking from transparent or refractive objects).
GBuf ID – Only objects with this G-Buffer Object ID are considered.
IsMATID – When enabled, the pass considers the Material ID and renders accordingly. When disabled, these values are considered to be the Object ID.
Invert Selection – Use the opposite of the selected objects in the render pass.
Consider for Anti-Aliasing – When enabled, anti-aliasing is used where possible.
Affect Matte Objects – Sets whether to include matte objects when generating the render element. A matte object is an object that has been assigned a Wrapper Material or VRayObjectProperties with the Matte surface option enabled.
The Object Select Render Element allows items to be isolated for easier control at a composite level. In the example, the curtains are color corrected and tinted yellow.
V-Ray Object Select
Original Beauty composite
V-Ray Object Select edited
Resulting Beauty composite