The RenderMan Interface - Paul Bourke

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FrameBegin 2 ##Shaders PIXARwood, PIXARmarble ##CameraOrientation 10.0 20.0 10.0 0.0 0.0 0.0 Transform [.707107 -.57735 -.408248 0 0 .57735 -.815447 0 -.707107 -.57735 -.408248 0 0 0 24.4949 1 ] WorldBegin AttributeBegin Attribute "identifier" "name" ["myball"] AttributeBegin Attribute "identifier" "shadinggroup" ["tophalf"] Surface "PIXARmarble" ShadingRate .1 Sphere .5 0 .5 360 AttributeEnd AttributeBegin Attribute "identifier" "shadinggroup" ["bothalf"] Surface "plastic" Sphere .5 -.5 0 360 AttributeEnd AttributeEnd AttributeBegin Attribute "identifier" "name" ["floor"] Surface "PIXARwood" "roughness" [.3] "d" [1] # geometry for floor AttributeEnd WorldEnd FrameEnd D.2 RIB Entity Files A RIB Entity File contains a single User Entity. RIB Entity Files are incomplete since they do not contain enough information to describe a frame to a renderer. RIB Entity Files depend on Render Management services for integration into “legal,” or complete, RIB Files. These files provide the mechanism for 3-D “clip-art” by allowing Render Managers to insert objects into preexisting scenes. RIB Entity Files must conform to the User Entity Conventions described in the User Entites section. To summarize, a User Entity must be delimited by an attribute block, must have a name attribute, and must be completely contained within a single attribute block. Three additional requirements must also be met: • The header hint: ##RenderMan RIB-Structure 1.1 Entity must be included as the first line of the file. • The Entity must be built in an object coordinate system which is centered about the origin. • The Entity must have a RIB bound request to provide a single bounding box of all geometric primitives in the User Entity. 191
D.2.1 RIB Entity File example ##RenderMan RIB-Structure 1.1 Entity AttributeBegin #begin unit cube Attribute "identifier" "name" "unitcube" Bound -.5 .5 -.5 .5 -.5 .5 TransformBegin # far face Polygon "P" [.5 .5 .5 -.5 .5 .5 -.5 -.5 .5 .5 -.5 .5] Rotate 90 0 1 0 # right face Polygon "P" [.5 .5 .5 -.5 .5 .5 -.5 -.5 .5 .5 -.5 .5] # near face Rotate 90 0 1 0 Polygon "P" [.5 .5 .5 -.5 .5 .5 -.5 -.5 .5 .5 -.5 .5] # left face Rotate 90 0 1 0 Polygon "P" [.5 .5 .5 -.5 .5 .5 -.5 -.5 .5 .5 -.5 .5] TransformEnd TransformBegin # bottom face Rotate 90 1 0 0 Polygon "P" [.5 .5 .5 -.5 .5 .5 -.5 -.5 .5 .5 -.5 .5] TransformEnd TransformBegin # top face Rotate -90 1 0 0 Polygon "P" [.5 .5 .5 -.5 .5 .5 -.5 -.5 .5 .5 -.5 .5] TransformEnd AttributeEnd #end unit cube D.3 RenderMan Renderer Resource Files Renderer Resource Files are intended to provide information to Render Managers and modelers about the specific features, attributes, options, and resources of a particular renderer. In an environment where multiple renderers are available, a Render Manager can provide the user with the ability to tailor RIB file to best suit the desired renderer. Renderer Resource Files should be shipped with any RenderMan renderer and should be updated on-site by the local system administrator to reflect the resources available to a renderer. Only those sections containing site-specific information can be customized in this way. The simple ASCII format of Renderer Resource Files makes them easy to read, modify and parse. D.3.1 Format of Renderer Resource Files A Renderer Resource File is broken up into a series of sections delimited by special keywords. Within each section, all related information is provided using a section-specific predefined format. A special include keyword is provided to simplify the task of customizing Resource Files. The keywords are as follows: 192
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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
Page 151 and 152: Return surface normal given a point
Page 153 and 154: diffuse returns the diffuse compone
Page 155 and 156: prevent aliasing. If one set of tex
Page 157 and 158: 15.7.3 Shadow depth maps Shadow dep
Page 159 and 160: These functions access the value of
Page 161 and 162: The standard data names supported b
Page 163 and 164: } Oi = sum; Ci = Cs * Oi * (Ka + Kd
Page 165 and 166: path of the ray. The input Ci and O
Page 167 and 168: A.2.3 Metal surface surface metal(
Page 169 and 170: distantlight( float intensity = 1;
Page 171 and 172: 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: ##Include filename This entry allow
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 224: and uniform variables on an RiNuPat
Page 225 and 226: Statement About Pixar’s Copyright
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The RenderMan Interface - Paul Bourke

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