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### 13 Cards in this Set

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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 z-axis. The projection and screen transformation convert from camera coordinates to screen coordinates Point Coordinate Systems: "screen" The 2-D 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 (un-cropped) 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 sub-rectangle 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 user-specified 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