The RenderMan Interface - Paul Bourke

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RiFormat (RtInt xresolution, RtInt yresolution, RtFloat pixelaspectratio) Set the horizontal (xresolution) and vertical (yresolution) resolution (in pixels) of the image to be rendered. The upper left hand corner of the image has coordinates (0,0) and the lower right hand corner of the image has coordinates (xresolution, yresolution). If the resolution is greater than the maximum resolution of the device, the desired image is clipped to the device boundaries (rather than being shrunk to fit inside the device). This command also sets the pixel aspect ratio. The pixel aspect ratio is the ratio of the physical width to the height of a single pixel. The pixel aspect ratio should normally be set to 1 unless a picture is being computed specifically for a display device with non-square pixels. Implicit in this command is the creation of a display viewport with a viewportaspectratio = xresolution · pixelaspectratio yresolution The viewport aspect ratio is the ratio of the physical width to the height of the entire image. An image of the desired aspect ratio can be specified in a device independent way using the procedure RiFrameAspectRatio described below. The RiFormat command should only be used when an image of a specified resolution is needed or an image file is being created. If this command is not given, the resolution defaults to that of the display device being used (see the Displays section, p. 27). Also, if xresolution, yresolution or pixelaspectratio is specified as a nonpositive value, the resolution defaults to that of the display device for that particular parameter. RIB BINDING Format xresolution yresolution pixelaspectratio EXAMPLE Format 512 512 1 SEE ALSO RiDisplay, RiFrameAspectRatio RiFrameAspectRatio ( RtFloat frameaspectratio ) frameaspectratio is the ratio of the width to the height of the desired image. The picture produced is adjusted in size so that it fits into the display area specified with RiDisplay or RiFormat with the specified frame aspect ratio and is such that the upper left corner is aligned with the upper left corner of the display. If this procedure is not called, the frame aspect ratio defaults to that determined from the resolution and pixel aspect ratio. RIB BINDING FrameAspectRatio frameaspectratio 23
EXAMPLE RiFrameAspectRatio (4.0/3.0); SEE ALSO RiDisplay, RiFormat RiScreenWindow ( RtFloat left, RtFloat right, RtFloat bottom, RtFloat 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. The rectangle specified is in the screen coordinate system. The values left, right, bottom, and top are mapped to the respective edges of the display. The default values for the screen window coordinates are: (–frameaspectratio, frameaspectratio, –1, 1). if frameaspectratio is greater than or equal to one, or (–1, 1, –1/frameaspectratio, 1/frameaspectratio). if frameaspectratio is less than or equal to one. For perspective projections, this default gives a centered image with the smaller of the horizontal and vertical fields of view equal to the field of view specified with RiProjection. Note that if the camera transformation preserves relative x and y distances, and if the ratio abs(right − left) abs(top − bottom) is not the same as the frame aspect ratio of the display area, the displayed image will be distorted. RIB BINDING ScreenWindow left right bottom top ScreenWindow [left right bottom top] EXAMPLE ScreenWindow -1 1 -1 1 SEE ALSO RiCropWindow, RiFormat, RiFrameAspectRatio, RiProjection RiCropWindow ( RtFloat xmin, RtFloat xmax, RtFloat ymin, RtFloat ymax ) Render only a subrectangle of the image. This command does not affect the mapping from screen to raster coordinates. This command is used to facilitate debugging regions of an image, and to help in generating panels of a larger image. These values are specified as fractions of the raster window defined by RiFormat and RiFrameAspectRatio, and therefore lie between 0 and 1. By default the entire raster window is rendered. The integer image locations corresponding to these limits are given by 24
Page 1 and 2: The RenderMan Interface Version 3.2
Page 3 and 4: TABLE OF CONTENTS List of Figures L
Page 5 and 6: 12.1 Surface Shaders . . . . . . .
Page 7 and 8: Section I DIFFERENCES BETWEEN VERSI
Page 9 and 10: LIST OF TABLES 4.1 Camera Options .
Page 11 and 12: PREFACE This document is version 3.
Page 13 and 14: Section 1 INTRODUCTION The RenderMa
Page 15 and 16: created using this language. This l
Page 17 and 18: Depth of Field The ability to simul
Page 19 and 20: typedef RtPointer typedef RtPointer
Page 21 and 22: RiContext (ctx1); ... There is no R
Page 23 and 24: Section 3 RELATIONSHIP TO THE RENDE
Page 25 and 26: through the interface. Any place wh
Page 27 and 28: RtContextHandle RiGetContext ( void
Page 29 and 30: RiWorldBegin (); ... RiColor (...);
Page 31 and 32: Camera Option Type Default Descript
Page 33: ottom top left right Screen Window
Page 37 and 38: not support the special projection
Page 39 and 40: This procedure sets the times at wh
Page 41 and 42: Output depth values are the camera-
Page 43 and 44: A particular renderer implementatio
Page 45 and 46: Renderers may additionally produce
Page 47 and 48: The number of color components, n,
Page 49 and 50: RiAttributeBegin () RiAttributeEnd
Page 51 and 52: RIB BINDING Color c0 c1... cn Color
Page 53 and 54: An area light source is defined by
Page 55 and 56: The sequencenumber is the integer l
Page 57 and 58: 4.2.5 Displacement shading The grap
Page 59 and 60: SEE ALSO RiExterior RiAtmosphere Ri
Page 61 and 62: Matte onoff EXAMPLE RiMatte (RI TRU
Page 63 and 64: object foo2 will be drawn when the
Page 65 and 66: the exterior is the region adjacent
Page 67 and 68: RiIdentity ( ); SEE ALSO RiTransfor
Page 69 and 70: RiScale ( RtFloat sx, RtFloat sy, R
Page 71 and 72: 4.3.2 Transformation stack Transfor
Page 73 and 74: Section 5 GEOMETRIC PRIMITIVES The
Page 75 and 76: Information Name Type Class Floats
Page 77 and 78: No checking is done by the RenderMa
Page 79 and 80: 5.2 Patches Patches can be either u
Page 81 and 82: U V 0 1 2 3 12 13 14 15 4 5 6 7 8 9
Page 83 and 84: 10 x 7 Aperiodic Bezier Bicubic Pat
Page 85 and 86:
SEE ALSO 2 2 [ 0 0 1 1 ] 0 1 ”Pw
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parameterlist is a list of token-ar
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Requests a sphere defined by the fo
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Hyperboloid 0 0 0 .5 0 0 270 ”Cs
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z N z V point2 height U x x y 0 max
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particle. If a primitive variable i
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The code array is a sequence of mac
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is an array of floats that define t
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The helper program generates geomet
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Procedural ”DynamicLoad” [ ”m
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SolidBegin ( ”difference” ); So
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Section 6 MOTION Some rendering pro
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Transformations Geometry Shading Ri
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channels (usually an RGB color) can
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Image Forward Axis Up Axis Right Ax
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ErrorHandler ”ignore” ErrorHand
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Part II The RenderMan Shading Langu
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spaces (such as CMYK or pseudocolor
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transmit reflect transmit P E light
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Section 10 RELATIONSHIP TO THE REND
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Section 11 TYPES The Shading Langua
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Coordinate System ”shader” ”c
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As in C, individual array elements
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Light Source E Vantage Point N L Il
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Surface Element to Illuminate L N I
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Name Type Storage Class Description
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• conditional execution, • loop
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This example integrates over a hemi
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Shader instance variable values can
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} return 2 * (vector noise(p)) - 1;
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These functions compute power and i
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The actual change in a variable is
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Return a unit vector in the directi
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Return surface normal given a point
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diffuse returns the diffuse compone
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prevent aliasing. If one set of tex
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15.7.3 Shadow depth maps Shadow dep
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These functions access the value of
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The standard data names supported b
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} Oi = sum; Ci = Cs * Oi * (Ka + Kd
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path of the ray. The input Ci and O
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A.2.3 Metal surface surface metal(
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distantlight( float intensity = 1;
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A.6 Imager Shaders A.6.1 Background
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variable definitions ; variables va
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triple sixteentuple arrayindex: [ e
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Logical expressions have the value
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typedef RtPointer RtContextHandle;
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RiOptionV(RtToken name, RtInt n, Rt
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RtInt n, RtToken tokens[], RtPointe
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#define RIE_NOTATTRIBS ((RtInt)26)
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Comments Any occurrence of the ’#
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In the following sections the synta
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C.2.2 Error handling There are two
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adhandle badparamlist badripcode ba
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v e r s i o n 212 # version 003 007
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Using RIB File structuring conventi
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Attribute Format PixelFilter Shadin
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##Include filename This entry allow
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D.2.1 RIB Entity File example ##Ren
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Motion Blur Programmable Shading Di
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} E.4 Gaussian Filter RtFloat RiGau
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Appendix G RENDERMAN INTERFACE QUIC
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Function RiOpacity (color) RiOption
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Geometric Primitives (continued) Fu
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Function abs(x) Math Functions Desc
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Function area(P) calculatenormal(P)
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Texture Mapping Functions Function
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RiInterior 47 RiLightSource 42 RiMa
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and uniform variables on an RiNuPat
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Statement About Pixar’s Copyright
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The RenderMan Interface - Paul Bourke

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