/**************************************************************************** * oakplank.sl * * Description: makes procedural varnished wood planks. The planks * are projected onto the x-y plane, with the length aligned with * the y axis. The subpattern within each individual plank is just * a shifted version of the oaktexture function from oak.h. * * Parameters for the coordinate mapping: * shadingspace - space in which the pattern is laid out * shadingfreq - overall scaling factor for the pattern * Pref - if supplied, gives the reference pose * * Parameters for the pattern of the plank structure: * plankwidth, planklength - size of the planks * groovewidth, grooveheight - width of the grooves between planks * Cgroove - color of the grooves between the planks * groovedepth - how far down do the grooves displace? * edgewidth - how close to the plank border does the wood start to curl? * varyhue, varysat, varylum - control plank-to-plank color variation * * Parameters for the color and pattern of the wood grain: * Clightwood - the light, "background" wood color * Cdarkwood - the darker color in the ring/grain * ringfreq - mean frequency of ring spacing * ringunevenness - 0=equally spaced rings, larger is unequally spaced * grainfreq - frequency of the fine grain * ringnoise, ringnoisefreq - general warping of the domain * trunkwobble, trunkwobblefreq - controls noise which wobbles the * axis of the trunk so that it's not perfectly on the z axis. * angularwobble, angularwobblefreq - warping indexed by angle about * the z axis. * ringy, grainy - overall scale on the degree to which rings and * grain are weighted. 0 turns one off, 1 makes full effect. * divotdepth - depth (in shader units) of the displacement due to * ring or grain. * truedisp - 1 for true displacement, 0 for bump mapping * * Parameters for illumination model: * Ka, Kd, Ks, roughness - the usual meaning * Kr, blur, eta - reflection parameters for the tile * envname, envspace, envrad - environment mapping controls * rayjitter, raysamples - ray tracing controls * varnishlump, arnishlumpfreq - amp & freq of lumpiness in the varnish * *************************************************************************** * * Author: Larry Gritz, 1999 * * Contacts: lg@pixar.com * * $Revision: 1.1 $ $Date: 2000/08/28 01:30:35 $ * ****************************************************************************/ /* Comment out the following line if you do *not* wish to use BMRT and * PRMan together. */ #include "rayserver.h" #include "project.h" #include "pshad.h" #include "material.h" #include "noises.h" #include "displace.h" #include "patterns.h" #include "oak.h" /* Given 2-D texture coordinates ss,tt, filter widths ds, dt, and the * width and height of the grooves between tiles, figure out which * (integer indexed) plank we are on and what coordinates within our * individual plank we are shading. */ float plankpattern (float ss, tt, ds, dt; float plankwidth, planklength; float groovewidth, grooveheight; output float swhichplank, twhichplank; output float splank, tplank;) { /* Find which s plank we're on and our s coordinate within it */ swhichplank = floor (ss/plankwidth); splank = ss - swhichplank*plankwidth; /* Shift in t a random amount for each plank column */ float newt = tt + planklength*cellnoise(swhichplank); /* Find which t plank we're on and our t coordinate within it */ twhichplank = floor (newt/planklength); tplank = newt - twhichplank*planklength; /* Calculate our "in-plank" value by multiplying two perpendicular * filtered pulsetrain functions. */ return filteredpulsetrain (groovewidth, plankwidth, ss+groovewidth/2, ds) * filteredpulsetrain (grooveheight, planklength, newt+grooveheight/2, dt); } surface oakplank ( float Ka = 1, Kd = 1, Ks = .75, roughness = 0.1; float Kr = 1, blur = 0, eta = 1.5; DECLARE_DEFAULTED_ENVPARAMS; DEFAULT_PSHAD_PARAMS; float ringfreq = 8, ringunevenness = 0.5; float ringnoise = 0.02, ringnoisefreq = 1; float grainfreq = 25; float trunkwobble = 0.15, trunkwobblefreq = 0.025; float angularwobble = 1, angularwobblefreq = 1.5; float divotdepth = 0.012, truedisp = 0; color Clightwood = color (.5, .2, .067); /* light wood color */ color Cdarkwood = color(0.15, 0.077, 0.028); color Cgroove = color(0.02, 0.02, 0.02); float ringy = 1, grainy = 1; float plankwidth = 2, planklength = 30; float groovewidth = 0.05, grooveheight = 0.05; float varyhue = 0.015, varysat = 0.1, varylum = 0.5; float groovedepth = 0.03, edgewidth = 0.1; float varnishlump = 0.01, varnishlumpfreq = 0.5; ) { GET_PSHAD; float ss = xcomp(Pshad), tt = ycomp(Pshad), height = zcomp(Pshad); float dss = filterwidth(ss), dtt = filterwidth(tt); /* * Find out where in the pattern we are: which plank we're on, and * the (splank,tplank) coordinates (both on [0,1]) within our tile. */ float swhichplank, twhichplank, splank, tplank; float inplank = plankpattern (ss, tt, dss, dtt, plankwidth, planklength, groovewidth, grooveheight, swhichplank, twhichplank, splank, tplank); float plankindex = swhichplank + 13*twhichplank; point Ppat = point(splank-0.5,height-0.01*tplank,tplank) + vector(1,5,10)* (vector cellnoise(swhichplank,twhichplank) - 0.5); float wood = oaktexture (Ppat, dPshad, ringfreq, ringunevenness, grainfreq, ringnoise, ringnoisefreq, trunkwobble, trunkwobblefreq, angularwobble, angularwobblefreq, ringy, grainy); color Cwood = mix (Clightwood, Cdarkwood, wood); Cwood = varyEach (Cwood, plankindex, varyhue, varysat, varylum); Cwood = mix (Cgroove, Cwood, inplank); /* Displacement: the edges of the planks displace down a bit, as do * the grooves between planks. */ float edgedisp = smoothpulse (0, edgewidth, plankwidth-edgewidth, plankwidth, splank); edgedisp *= smoothpulse (0, edgewidth, planklength-edgewidth, planklength, tplank); normal Nf = faceforward (normalize(N), I); float disp = -wood*divotdepth + groovedepth*(edgedisp-1); disp += varnishlump * filteredsnoise (Pshad*varnishlumpfreq, dPshad*varnishlumpfreq); Nf = faceforward(Displace (Nf, "shader", disp, truedisp), I); /* Illumination model * Less specular in the grooves, more specular in the dark wood. */ float specadjusted = 1 + .3*wood - 0.8*(1-inplank); Ci = MaterialShinyPlastic (Nf, Cwood, Ka, Kd, specadjusted*Ks, roughness, specadjusted*Kr, blur, eta, 1, ENVPARAMS); Oi = Os; Ci *= Oi; }