Buffers.7z This archive contains the scene file used for most of the buffers shown on these pages
These are buffers which the render engine itself makes available.
Buffer types
Final Render
Final output from F9 or F10. For some of the other buffers we have changed the material for the dragon or beads.
Alpha
A buffer that is black where there are no objects, or there are objects with a degree of transparency. A backdrop image does not contribute to the alpha channel. When there is no fog, the image will appear like our example. When there is fog, there will be no alpha as such because the fog will block the background
Backdrop
The backdrop image, color or gradient for the scene
Camera Tangent Space XYZ
The surface normals relative to the camera
Coverage
The Coverage buffer is only for use with applications that support such buffers (compositing applications like Nuke or Fusion). It performs three separate tasks. The Red channel contains the information necessary for a compositing package to create a coverage buffer for the scene (an enhanced depth buffer). The Green channel contains a standard depth buffer, and the Blue channel is an Object ID buffer
Depth
Black nearest the camera fading to white with distance. The LDR, or 8-bit, version is limited to only 255 possible steps
Edges
A buffer containing just rendered edges. Shown here Intersection edges for the dragon and Silhouette edges for the spheres (with Other Edges for the green Sphere)
Geometry
A grayscale buffer just containing the geometry in the scene
Lens Flare
A buffer containing just the lens flare element from the render
Motion
The Motion Vector Buffer outputs a color channel that shows object movement within the scene. This Buffer can be used by post-processing software to calculate a 2D motion blur effect. The advantage is that it is usually quicker to render compared to true 3D motion blur, but there are limitations for things like camera motion and transparency.
Normals
The surface normals in world space
Object ID
Objects are given different colors to separate them. For an HDR image output, this will look only like white in the Image Viewer, but there are different Red, Green, and Blue levels to indicate discrete objects
Object Position
The position of each scene object in Local Space. This buffer records X, Y, and Z information rather than color
Surface ID
Surfaces are given different colors to separate them. For an HDR image output, this will look only like white in the Image Viewer, but there are different Red, Green, and Blue levels to indicate discrete surfaces
Texture Position
This buffer records X, Y, and Z information rather than color.
Transparency
Shows areas that are transparent to other objects or the background. See also Refraction
UV
Shows the default UV. Other UV maps are indicated but not detailed. A layered object can only have one default UV map.
World Position
This buffer records X, Y, and Z information rather than color. It appears differently in VPR (left) than Image Viewer (right) because with VPR values are multiplied to fall between 0-255, whereas Image Viewer can have negative values
dPdU/dPdV
The direction vectors for the U and V coordinate in world space. Some uses are texture filtering, anisotropy, and bump mapping. This buffer records X, Y. and Z information rather than color.
Buffers.7z This archive contains the scene file used for most of the buffers shown on these pages
