The RenderMan Interface - Paul Bourke

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RiDisk(1.0, 0.5, 270.0, RI NULL); SEE ALSO RiCone, RiHyperboloid RiTorus ( RtFloat majorradius, RtFloat minorradius, RtFloat phimin, RtFloat phimax, RtFloat thetamax, ...parameterlist...) Requests a torus defined by the following equations: θ = u · thetamax φ = phimin + (phimax − phimin) r = minorradius · cos(φ) z = minorradius · sin(φ) x = (majorradius + r) · cos(θ) y = (majorradius + r) · sin(θ) Note that if phimax−phimin or thetamax is not equal to 360 degrees, the torus is open. RIB BINDING Torus rmajor rminor phimin phimax thetamax ...parameterlist... Torus [rmajor rminor phimin phimax thetamax] ...parameterlist... EXAMPLE Torus 1 .3 60 90 360 SEE ALSO RiSphere 5.5 Point and Curve Primitives The RenderMan Interface includes lightweight primitives for specifying point clouds, lines, curves, or ribbons. These primitives are especially useful for representing many particles, hairs, etc. RiPoints ( RtInt npoints, ...parameterlist...) Draws npoints number of point-like particles. parameterlist is a list of token-array pairs where each token is one of the standard geometric primitive variables, a variable that has been defined with RiDeclare, or is given as an inline declaration. The parameter list must include at least position (”P”) information, one value for each 83
particle. If a primitive variable is of class varying or vertex, the array contains npoints data values of the appropriate type, i.e., one per particle. If the variable is uniform or constant, the array contains a single element. The size, in object space, of each particle can be specified in the parameter list by using the primitive variable ”width”, which provides a varying float. If ”width” is not specified in the parameter list then it will default to 1.0, meaning that all particles should have an apparent diameter 1.0 units in object space. If all the points are of the same size, the user may specify the variable ”constantwidth”, which is defined as type constant float to supply a single width value for all points. Each particle is treated independently. This means a particle is shaded only once and does not have access to derivative information. RIB BINDING Points ...parameterlist... The number of points is determined implicitly by the length of the ”P” array. EXAMPLE Points ”P” [.5 -.5 0 -.5 -5 0 -.5 .5 0 .5 .5 0] ”width” [.1 .12 .05 .02] RiCurves ( RtToken type, RtInt ncurves, RtInt nvertices[], RtToken wrap, ...parameterlist...) Draws ncurves number of lines, curves, or ribbon-like particles of specified width through a set of control vertices. Multiple disconnected individual curves may be specified using one call to RiCurves. The parameter ncurves is the number of individual curves specified by this command, and nvertices is an array of length ncurves integers specifying the number of vertices in each of the respective curves. The interpolation method given by type can be either ”linear” or ”cubic”. Cubic curves interpolate using the v basis matrix and step size set by RiBasis. The u parameter changes across the width of the curve (if it has any discernable width), whereas the v parameter changes across the length of the curve (i.e., the direction specified by the control vertices). Curves may wrap around in the v direction, depending on whether wrap is ”periodic” or ”nonperiodic”. Curves that wrap close upon themselves at the ends and the first control points will be automatically repeated. As many as three control points may be repeated, depending on the basis matrix of the curve. parameterlist is a list of token-array pairs where each token is one of the standard geometric primitive variables, a variable that has been defined with RiDeclare, or is given as an inline declaration. The parameter list must include at least position (”P” or ”Pw”) information. The width along the curve may be specified with either a special ”width” parameter that is a varying float argument, or a ”constantwidth” parameter that is a constant float (one value for the entire RiCurves). Widths are specified in object space units of the curve. If no ”width” vector or ”constantwidth” value is given, the default width is 1.0 units in object space. Primitive variables of class constant should supply a single value of the appropriate type for the entire RiCurves. Primitive variables of class uniform should supply a 84
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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-
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 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: z N z V point2 height U x x y 0 max
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
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;
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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;
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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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