The RenderMan Interface - Paul Bourke

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Function noise(v), noise(u,v), noise(pt), noise(pt,t) pnoise(v,vp), pnoise(u,v,up,vp), pnoise(pt,ptp), pnoise(pt,t,ptp,tp) Math Functions (continued) Description pow(x,y) returns x y . radians(deg) random() returns a value which is a random function of its arguments. Its value is always between 0 and 1. <strong>The</strong> domain of this noise function can be 1-D (one float), 2-D (two floats), 3-D (one point), or 4-D (one point and one float). returns a value like noise, but with the given periods over its domain. converts from degrees to radians. returns a float, color, or point whose components are a random number between 0 and 1. round(x) returns the integer closest to x. sign(x) returns −1 with a negative argument, 1 with a positive argument, and 0 if its argument is zero. sin(a) standard trigonometric function of radian arguments. smoothstep(min, max, value) spline([basis,] value, f1, f2, ... fn spline([basis,] value, array) sqrt(x) returns 0 if value < min, 1 if value > max, and performs a smooth Hermite interpolation between 0 and 1 in the interval min to max. fits a spline to the control points given. At least four control points must always be given. fits a spline to the control points given in the array. returns pow(x,.5). step(min,value) returns 0 if value < min; otherwise 1. tan(a) standard trigonometric function of radian arguments. 205
Function area(P) calculatenormal(P) depth(P) distance(p1, p2) faceforward(N, I) fresnel(I, N, eta, Kr, Kt [, R, T]) length(V) Geometric Functions Description returns the differential surface area. returns surface normal given a point on the surface. returns the depth of the point P in camera coordinates. <strong>The</strong> depth is normalized to lie between 0 (at the near clipping plane) and 1 (at the far clipping plane). returns the distance between two points. flips N so that it faces in the direction opposite to I. returns the reflection coefficient Kr and refraction (or transmission) coefficient Kt given an incident direction I, the surface normal N, and the relative index of refraction eta. Optionally, this procedure also returns the reflected (R) and transmitted (T) vectors. returns the length of a vector. normalize(V) returns a unit vector in the direction of V. ptlined(Q, P1, P2) transform(fromspace, tospace, P) vtransform(fromspace, tospace, V) ntransform(fromspace, tospace, N) reflect(I, N) refract(I, N, eta) setxcomp(P, x), setycomp(P, y), setzcomp(P, z) xcomp(P), ycomp(P), zcomp(P) returns the distance from Q to the line segment joining P1 and P2. transforms the point P from the coordinate system fromspace to the coordinate system tospace. If fromspace is absent, it is assumed to be the ”current” coordinate system. transforms the vector V from the coordinate system fromspace to the coordinate system tospace. If fromspace is absent, it is assumed to be the ”current” coordinate system. transforms the normal N from the coordinate system fromspace to the coordinate system tospace. If fromspace is absent, it is assumed to be the ”current” coordinate system. returns the reflection vector given an incident direction I and a normal vector N. returns the transmitted vector given an incident direction I, the normal vector N and the relative index of refraction eta. sets the x, y, or z component. gets the x, y, or z component. 206
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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
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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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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
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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
Page 211 and 212: Function RiOpacity (color) RiOption
Page 213 and 214: Geometric Primitives (continued) Fu
Page 215: Function abs(x) Math Functions Desc
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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