The RenderMan Interface - Paul Bourke

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A few features previously described are now depricated due to either having been ambiguously articulated, useless, unimplementable, or having been replaced by more recent and obviously superior features. These are therefore removed from the RenderMan Interface: • Deformations and transformation shaders have been eliminated. We now recognize that this functionality is not only ambiguous, but should be considered a modeling feature, not a rendering feature. • Bump maps (including the RiMakeBump and the Shading Language bump() function) have been removed. This functionality is completely subsumed by displacement mapping. • Support for “Painter’s algorithm” hidden surface removal is no longer required. 213
Statement About Pixar’s Copyright and Trademark Rights for the RenderMan 3-D Scene Description Interface The RenderMan 3-D Scene Description Interface, created by Pixar, is used for describing three-dimensional scenes in a manner suitable for photorealistic image synthesis. The RenderMan Interface specifies procedure calls that are listed collectively in the Procedures List appendix (Appendix F) to the RenderMan Interface document. The RenderMan Interface Bytestream (“RIB”) is a byte-oriented protocol for specifying requests to the RenderMan Interface, and specifies a set of encoded requests according to the methods described in the RenderMan Interface document. Pixar owns the copyrights in the RenderMan Interface and RIB including the Procedures List, Binary Encoding table and the RenderMan written specifications and manuals. These may not be copied without Pixar’s permission. Pixar also owns the trademark “Render- Man”. Pixar will enforce its copyrights and trademark rights. However, Pixar does not intend to exclude anyone from: (a) creating modeling programs that make RenderMan procedure calls or RIB requests. (b) creating rendering systems that execute the RenderMan procedure calls or RIB requests provided a separate written agreement is entered into with Pixar. Permitted Use of the RenderMan Interface by Modelers Pixar gives permission for you to copy the procedure calls included the Procedures List and the encoded requests in the Binary Encoding table for writing modeling programs that use the RenderMan Interface. Any program that incorporates any of the RenderMan procedure calls or RIB requests must include the proper copyright notice on each program copy. The copyright notice should appear in a manner and location to give reasonable notice of Pixar’s copyright, as follows: The RenderMan R○ Interface Procedures and Protocol are: Copyright 1988, 1989, 2000, Pixar All Rights Reserved The right to copy the RenderMan procedures from the Procedures List does not include the right to copy the RenderMan documentation or manuals, or the programming code in any Pixar products, in whole or in part, in any manner except as described above. Written License for Use of the RenderMan Interface by Renderers A no-charge license is available from Pixar for anyone who wishes to write a renderer that uses the Pixar RenderMan procedure calls or RIB requests. This license must be in writing. Limited Use of the Trademark “RenderMan” The trademark “RenderMan” should refer only to the scene description interface created by Pixar. Anyone that creates a routine or computer program that includes any of the 214
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The RenderMan Interface Version 3.2
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TABLE OF CONTENTS List of Figures L
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12.1 Surface Shaders . . . . . . .
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Section I DIFFERENCES BETWEEN VERSI
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LIST OF TABLES 4.1 Camera Options .
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PREFACE This document is version 3.
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Section 1 INTRODUCTION The RenderMa
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created using this language. This l
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Depth of Field The ability to simul
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typedef RtPointer typedef RtPointer
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RiContext (ctx1); ... There is no R
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Section 3 RELATIONSHIP TO THE RENDE
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through the interface. Any place wh
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RtContextHandle RiGetContext ( void
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RiWorldBegin (); ... RiColor (...);
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Camera Option Type Default Descript
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ottom top left right Screen Window
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EXAMPLE RiFrameAspectRatio (4.0/3.0
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not support the special projection
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This procedure sets the times at wh
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Output depth values are the camera-
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A particular renderer implementatio
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Renderers may additionally produce
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The number of color components, n,
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RiAttributeBegin () RiAttributeEnd
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RIB BINDING Color c0 c1... cn Color
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An area light source is defined by
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The sequencenumber is the integer l
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4.2.5 Displacement shading The grap
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SEE ALSO RiExterior RiAtmosphere Ri
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Matte onoff EXAMPLE RiMatte (RI TRU
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object foo2 will be drawn when the
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the exterior is the region adjacent
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RiIdentity ( ); SEE ALSO RiTransfor
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RiScale ( RtFloat sx, RtFloat sy, R
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4.3.2 Transformation stack Transfor
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Section 5 GEOMETRIC PRIMITIVES The
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Information Name Type Class Floats
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No checking is done by the RenderMa
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5.2 Patches Patches can be either u
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U V 0 1 2 3 12 13 14 15 4 5 6 7 8 9
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10 x 7 Aperiodic Bezier Bicubic Pat
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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
Page 173 and 174: variable definitions ; variables va
Page 175 and 176: triple sixteentuple arrayindex: [ e
Page 177 and 178: Logical expressions have the value
Page 179 and 180: typedef RtPointer RtContextHandle;
Page 181 and 182: RiOptionV(RtToken name, RtInt n, Rt
Page 183 and 184: RtInt n, RtToken tokens[], RtPointe
Page 185 and 186: #define RIE_NOTATTRIBS ((RtInt)26)
Page 187 and 188: Comments Any occurrence of the ’#
Page 189 and 190: In the following sections the synta
Page 191 and 192: C.2.2 Error handling There are two
Page 193 and 194: adhandle badparamlist badripcode ba
Page 195 and 196: v e r s i o n 212 # version 003 007
Page 197 and 198: Using RIB File structuring conventi
Page 199 and 200: Attribute Format PixelFilter Shadin
Page 201 and 202: ##Include filename This entry allow
Page 203 and 204: D.2.1 RIB Entity File example ##Ren
Page 205 and 206: Motion Blur Programmable Shading Di
Page 207 and 208: } E.4 Gaussian Filter RtFloat RiGau
Page 209 and 210: Appendix G RENDERMAN INTERFACE QUIC
Page 211 and 212: Function RiOpacity (color) RiOption
Page 213 and 214: Geometric Primitives (continued) Fu
Page 215 and 216: Function abs(x) Math Functions Desc
Page 217 and 218: Function area(P) calculatenormal(P)
Page 219 and 220: Texture Mapping Functions Function
Page 221 and 222: RiInterior 47 RiLightSource 42 RiMa
Page 223: and uniform variables on an RiNuPat
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The RenderMan Interface - Paul Bourke

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