The RenderMan Interface - Paul Bourke

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The standard types are ”hidden” and ”null”. ”hidden”, which is the default, performs standard hidden-surface computations. The hider ”null” performs no pixel computation and hence produces no output. Other implementation-specific hidden-surface algorithms can also be selected using this routine; for example, an implementation may choose to support type ”paint”, which might draw the objects in the order in which they are defined. RIB BINDING Hider type ...parameterlist... EXAMPLE RiHider ”paint” Rendering programs compute color values in some spectral color space. This implies that multiplying two colors corresponds to interpreting one of the colors as a light and the other as a filter and passing light through the filter. Adding two colors corresponds to adding two lights. The default color space is NTSC-standard RGB; this color space has three samples. Color values of 0 are interpreted as black (or transparent) and values of 1 are interpreted as white (or opaque), although values outside this range are allowed. RiColorSamples ( RtInt n, RtFloat nRGB[], RtFloat RGBn[] ) This function controls the number of color components or samples to be used in specifying colors. By default, n is 3, which is appropriate for RGB color values. Setting n to 1 forces the rendering program to use only a single color component. The array nRGB is an n by 3 transformation matrix that is used to convert n component colors to 3 component NTSC-standard RGB colors. This is needed if the rendering program cannot handle multiple components. The array RGBn is a 3 by n transformation matrix that is used to convert 3 component NTSC-standard RGB colors to n component colors. This is mainly used for transforming constant colors specified as color triples in the Shading Language to the representation being used by the RenderMan Interface. Calling this procedure effectively redefines the type RtColor to be typedef RtFloat RtColor [n]; After a call to RiColorSamples, all subsequent color arguments are assumed to be this size. If the Spectral Color capability is not supported by a particular implementation, that implementation will still accept multiple component colors, but will immediately convert them to RGB color space and do all internal calculations with 3 component colors. RIB BINDING ColorSamples nRGB RGBn 35
The number of color components, n, is derived from the lengths of the nRGB and RGBn arrays, as described above. EXAMPLE ColorSamples [.3.3 .4] [1 1 1] RtFloat frommonochr[] = {.3, .3, .4}; RtFloat tomonochr[] = {1., 1., 1.}; RiColorSamples (1, frommonochr, tomonochr); SEE ALSO RiColor, RiOpacity The method of specifying and using level of detail is discussed in the section on Detail. RiRelativeDetail ( RtFloat relativedetail ) The relative level of detail scales the results of all level of detail calculations. The level of detail is used to select between different representations of an object. If relativedetail is greater than 1, the effective level of detail is increased, and a more detailed representation of all objects will be drawn. If relativedetail is less than 1, the effective level of detail is decreased, and a less detailed representation of all objects will be drawn. RIB BINDING RelativeDetail relativedetail EXAMPLE RelativeDetail 0.6 SEE ALSO RiDetail, RiDetailRange 4.1.4 Implementation-specific options Rendering programs may have additional implementation-specific options that control parameters that affect either their performance or operation. These are all set by the following procedure. RiOption ( RtToken name, ...parameterlist...) 36
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 and 34: ottom top left right Screen Window
Page 35 and 36: EXAMPLE RiFrameAspectRatio (4.0/3.0
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: Renderers may additionally produce
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
Page 87 and 88: parameterlist is a list of token-ar
Page 89 and 90: Requests a sphere defined by the fo
Page 91 and 92: Hyperboloid 0 0 0 .5 0 0 270 ”Cs
Page 93 and 94: z N z V point2 height U x x y 0 max
Page 95 and 96: particle. If a primitive variable i
Page 97 and 98:
The code array is a sequence of mac
Page 99 and 100:
is an array of floats that define t
Page 101 and 102:
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
Page 117 and 118:
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
Page 123 and 124:
Section 10 RELATIONSHIP TO THE REND
Page 125 and 126:
Section 11 TYPES The Shading Langua
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Coordinate System ”shader” ”c
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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
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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
Page 153 and 154:
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
Page 161 and 162:
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;
Page 171 and 172:
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
Page 209 and 210:
Appendix G RENDERMAN INTERFACE QUIC
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Function RiOpacity (color) RiOption
Page 213 and 214:
Geometric Primitives (continued) Fu
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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
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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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