The RenderMan Interface - Paul Bourke

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Sets the named implementation-specific option. A rendering system may have certain options that must be set before the renderer is initialized. In this case, RiOption may be called before RiBegin to set those options only. Although RiOption is intended to allow implementation-specific options, there are a number of options that we expect that nearly all implementations will need to support. It is intended that when identical functionality is required, that all implementations use the option names listed in Table 4.5. RIB BINDING Option name ...parameterlist... EXAMPLE Option ”limits” ”gridsize” [32] ”bucketsize” [12 12] SEE ALSO RiAttribute Option name/param Type Default Description ”searchpath” ”archive” [s] string ”” List of directories to search for RIB archives. ”searchpath” ”texture” [s] string ”” List of directories to search for texture files. ”searchpath” ”shader” [s] string ”” List of directories to search for shaders. ”searchpath” ”procedural” [s] string ”” List of directories to search for dynamically-loaded RiProcedural primitives. ”statistics” ”endofframe” [i] integer ”” If nonzero, print runtime statistics when the frame is finished rendering. Table 4.5: Typical implementation-specific options 4.2 Attributes Attributes are parameters in the graphics state that may change while geometric primitives are being defined. The complete set of standard attributes is described in two tables: Table 4.6, Shading Attributes, and Table 4.11, Geometry Attributes. Attributes can be explicitly saved and restored with the following commands. All beginend blocks implicitly do a save and restore. 37
RiAttributeBegin () RiAttributeEnd () Push and pop the current set of attributes. Pushing attributes also pushes the current transformation. Pushing and popping of attributes must be properly nested with respect to various begin-end constructs. RIB BINDING AttributeBegin - AttributeEnd - EXAMPLE RiAttributeBegin (); SEE ALSO RiFrameBegin, RiTransformBegin, RiWorldBegin The process of shading is described is detail in Part II: The RenderMan Shading Language. The complete list of attributes related to shading are in Table 4.6, Shading Attributes. The graphics state maintains a list of attributes related to shading. Associated with the shading state are a current color and a current opacity. The graphics state also contains a current surface shader, a current atmosphere shader, a current interior volume shader, and a current exterior volume shader. All geometric primitives use the current surface shader for computing the color (shading) of their surfaces and the current atmosphere shader for computing the attenuation of light towards the viewer. Primitives may also attach the current interior and exterior volume shaders to their interior and exterior, which is used to alter the colors of rays spawned by trace() calls in the shaders bound to the primitives (in a renderer that supports this optional feature). The graphics state also contains a current list of light sources that are used to illuminate the geometric primitive. Finally, there is a current area light source. Geometric primitives can be added to a list of primitives defining this light source. 4.2.1 Color and opacity All geometric primitives inherit the current color and opacity from the graphics state, unless color or opacity are defined as part of the primitive. Colors are passed in arrays that are assumed to contain the number of color samples being used (see the section on Additional options). RiColor ( RtColor color ) Set the current color to color. Normally there are three components in the color (red, green, and blue), but this may be changed with the colorsamples request. 38
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 and 46: Renderers may additionally produce
Page 47: The number of color components, n,
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
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
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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
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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;
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
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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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