The RenderMan Interface - Paul Bourke

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Surface Name Parameter Type Default Description constant – – – – matte Ka float 1.0 Ambient coefficient Kd float 1.0 Diffuse coefficient metal Ka float 1.0 Ambient coefficient Ks float 1.0 Specular coefficient roughness float 0.1 Surface roughness shinymetal Ka float 1.0 Ambient coefficient Ks float 1.0 Specular coefficient Kr float 1.0 Reflection coefficient roughness float 0.1 Surface roughness texturename string ”” Environment map name plastic Ka float 1.0 Ambient coefficient Kd float 0.5 Diffuse coefficient Ks float 0.5 Specular coefficient roughness float 0.1 Surface roughness specularcolor color color ”rgb” (1,1,1) Specular color paintedplastic Ka float 1.0 Ambient coefficient Kd float 0.5 Diffuse coefficient Ks float 0.5 Specular coefficient roughness float 0.1 Surface roughness specularcolor color color ”rgb” (1,1,1) Specular color texturename string ”” Texture map name Table 4.8: Standard Surface Shader Parameters 45
4.2.5 Displacement shading The graphics state maintains a current displacement shader. Displacement shaders are procedures that can be used to modify geometry before the lighting stage. The RenderMan Interface includes one standard displacement shader: ”bumpy”. The definition of this displacement shader is given in Appendix A, Standard RenderMan Interface Shaders. The parameters controlling this displacement is given in Table 4.9. RiDisplacement ( RtToken shadername, ...parameterlist...) Set the current displacement shader to the named shader. shadername is the name of a displacement shader. If a particular implementation does not support the Displacements capability, displacement shaders can only change the normal vectors to generate bump mapping, and the surface geometry itself is not modified (see Displacement Shaders). RIB BINDING Displacement shadername ...parameterlist... EXAMPLE RiDisplacement (”displaceit”, RI NULL); SEE ALSO RiDeformation, RiMakeBump, RiSurface Surface Name Parameter Type Default Description bumpy amplitude float 1.0 Bump scaling factor texturename string ”” Displacement map name Table 4.9: Standard Displacement Shader Parameters 4.2.6 Volume shading The graphics state contains a current interior volume shader, a current exterior volume shader, and a current atmosphere shader. These shaders are used to modify the colors of rays traveling through volumes in space. The interior and exterior shaders define the material properties on the interior and exterior volumes adjacent to the surface of a geometric primitive. The exterior volume relative to a surface is the region into which the natural surface normal points; the interior is the opposite side. Interior and exterior shaders are applied to rays spawned by trace() calls in a surface shader. Renderers that do not support the optional Ray Tracing capability will also not support interior and exterior shaders. 46
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 and 48: The number of color components, n,
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: The sequencenumber is the integer l
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
Page 103 and 104: Procedural ”DynamicLoad” [ ”m
Page 105 and 106: SolidBegin ( ”difference” ); So
Page 107 and 108:
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
Page 127 and 128:
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
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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
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
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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
Page 179 and 180:
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
Page 193 and 194:
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)
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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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