This channel is anti-aliased.Ĭoverage The behavior for this channel varies for various 3D applications. Third-party plug-ins can use this channel as the basis for dynamic relighting and relief rendering. Surface Normals This channel maps the direction vector of each point on the surface of an object to the RGB channels. ![]() For information, see the RE:Vision Effects website. The RE:Vision Effects RE:Map plug-in suite can be used to map alternative textures onto objects. This channel can be used to check your UV maps or as input for the Displacement Map effect. Texture UV This channel contains the mapping coordinates of the textures of your object, mapped to the red and green channels. You can use a map generated using this channel to selectively apply effects to certain objects in a 3D scene-for example, to apply selective color adjustments. Object ID Each object can be assigned a separate ID value in the 3D application. Note For best results, match the White Point and Black Point settings of the effect with the near and far settings of your camera in the 3D application that generated the 3D image. When you apply the channel directly as a luma matte, you get fog. Effects such as the Lens Blur effect can use this information to generate depth-of-field effects. White represents the greatest distance black pixels are closest to the camera. Z-Depth Represents the distance of a given shaded pixel from the camera. ![]() Parameters White Point, Black Point The value that is mapped to white or black.ģD Channel The channel to extract from the 3D image Much of the following information is based on information provided by Lutz Albrecht, who also provides a two-part document on the Adobe website about integrating 3D applications with After Effects: To display 3D channel values for a pixel in the Info panel, apply the 3D Channel Extract effect, choose the channel from the 3D Channel menu in the Effect Controls panel, and then click the pixel in the Composition panel or Layer panel using the Selection tool. For example, extract the depth information in a 3D channel image file and then use it as an influence map in the Particle Playground effect, or extract values from the unclamped RGB channel to produce a matte that generates glowing highlights. You can then use the resulting layer as a control layer for other effects. The 3D Channel Extract effect makes auxiliary channels visible as either grayscale or multichannel color images.
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