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Point Coordinate Systems: "object"

The coordinate system in which the current geometric primitive is defined. The modeling transformation converts from object coordinates to world coordinates

Point Coordinate Systems: "world"

The standard reference coordinate system. The camera transformation converts from world coordinates to camera coordinates

Point Coordinate Systems: "camera"

A coordinate system with the vantage point at the origin and the direction of view along the positive zaxis. The projection and screen transformation convert from camera coordinates to screen coordinates

Point Coordinate Systems: "screen"

The 2D normalized coordinate system corresponding to the image plane. The raster transformation converts to raster coordinates

Point Coordinate Systems: "raster"

The raster or pixel coordinate system. An area of 1 in this coordinate system corresponds to the area of a single pixel. This coordinate system is either inherited from the display or set by selecting the resolution of the image desired

Point Coordinate Systems: "NDC"

Normalized device coordinates � like "raster" space, but normalized so that x and y both run from 0 to 1 across the whole (uncropped) image, with (0,0) being at the upper left of the image, and (1,1) being at the lower right (regardless of the actual aspect ratio).

Format( Int xresolution, Int yresolution, Float pixelaspectratio )

Set the horizontal (xresolution) and vertical (yresolution) resolution (in pixels) of the image to be rendered. viewportaspectratio = (xresolution * pixelaspectratio) / yresolution

ScreenWindow( Float left, Float right, Float bottom, Float top )

This procedure defines a rectangle in the image plane that gets mapped to the raster coordinate system and that corresponds to the display area selected

CropWindow( Float xmin, Float xmax, Float ymin, Float ymax )

Render only a subrectangle of the image.

Projection( Token name, ...parameterlist... )

The projection determines how camera coordinates are converted to screen coordinates, using the type of projection and the near/far clipping planes to generate a projection matrix.

Clipping( Float near, Float far )

Sets the position of the near and far clipping planes along the direction of view

ClippingPlane ( Float nx, Float ny, Float nz, Float x, Float y, Float z)

Adds a userspecified clipping plane

DepthOfField ( Float fstop, Float focallength, Float focaldistance )

focaldistance sets the distance along the direction of view at which objects will be in focus. lensdiameter = focallength/fstop
