The RenderMan Interface - Paul Bourke

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Name Type ”ShadingRate” uniform float ”Sides” uniform float ”Matte” uniform float ”GeometricApproximation:motionfactor” uniform float ”displacementbound:sphere” (*) uniform float ”displacementbound:coordinatesystem” (*) uniform string ”identifier:name” uniform string (*) Note that ”displacementbound:sphere” does not return the value exactly as specified in the RIB file, but rather returns its length in the coordinate system returned by ”displacementbound:coordinatesystem” (which currently always returns ”camera”). Table 15.4: Data names known to the attribute function. variable, the named data will be written into variable and option() will return a value of 1.0. If the data is unknown or the types do not match, variable will be unchanged and option() will return 0.0. Note that option data is always uniform. If variable is varying, the appropriate uniform-to-varying conversion will take place. The standard data names supported by option are listed in Table 15.5. A particular implementation may support additional option queries. Name Type Description ”Format” uniform float [3] x resolution, y resolution, pixel aspect ratio. ”DeviceResolution” uniform float [3] The resolution in x and y and the pixel aspect ratio. These are usually the three numbers passed to RiFormat, but may be different when RiFrameAspectRatio or RiScreenWindow are non-square. ”FrameAspectRatio” uniform float Frame aspect ratio. ”CropWindow” uniform float [4] Boundaries of the crop window. ”DepthOfField” uniform float [3] Fstop, focallength, focaldistance. ”Shutter” uniform float [2] Shutter open and close time. ”Clipping” uniform float [2] Near and far clip depths. Table 15.5: Data names known to the option function. float rendererinfo ( string name; output type variable ) Returns data that about the renderer itself. The name specifies the piece of information that will be returned in variable. The the data name is known to the renderer and its type and storage class match that of variable, the named data will be written into variable and rendererinfo() will return a value of 1.0. If the data is unknown or the types do not match, variable will be unchanged and rendererinfo() will return 0.0. Note that renderer data is always uniform. If variable is varying, the appropriate uniform-to-varying conversion will take place. 149
The standard data names supported by rendererinfo are listed in Table 15.6. A particular implementation may support additional rendererinfo queries. Name Type Description ”renderer” uniform string The brand name of the renderer. ”version” uniform float [4] Major, minor, release, and patch numbers. ”versionstring” uniform string The release numbers expressed as a string. Table 15.6: Data names known to the rendererinfo function. string shadername ( ) string shadername ( string shadertype ) If no parameter is passed, returns the name of the shader that is currently running. If the shadertype is supplied, this function returns the name of the shader of the specified type that is bound to the geometric primitive which is being shaded. Acceptable values of shadertype are ”surface”, ”displacement”, ”atmosphere”, ”lightsource”, ”interior”, ”exterior”. If the surface being shaded does not have a shader bound to it which matches the type, this function will return the empty string (””). 150
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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
Page 109 and 110: Transformations Geometry Shading Ri
Page 111 and 112: channels (usually an RGB color) can
Page 113 and 114: Image Forward Axis Up Axis Right Ax
Page 115 and 116: ErrorHandler ”ignore” ErrorHand
Page 117 and 118: Part II The RenderMan Shading Langu
Page 119 and 120: spaces (such as CMYK or pseudocolor
Page 121 and 122: transmit reflect transmit P E light
Page 123 and 124: Section 10 RELATIONSHIP TO THE REND
Page 125 and 126: Section 11 TYPES The Shading Langua
Page 127 and 128: Coordinate System ”shader” ”c
Page 129 and 130: As in C, individual array elements
Page 131 and 132: Light Source E Vantage Point N L Il
Page 133 and 134: Surface Element to Illuminate L N I
Page 135 and 136: Name Type Storage Class Description
Page 137 and 138: • conditional execution, • loop
Page 139 and 140: This example integrates over a hemi
Page 141 and 142: Shader instance variable values can
Page 143 and 144: } return 2 * (vector noise(p)) - 1;
Page 145 and 146: These functions compute power and i
Page 147 and 148: The actual change in a variable is
Page 149 and 150: 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: These functions access the value of
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 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
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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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