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/* |
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Teem: Tools to process and visualize scientific data and images . |
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Copyright (C) 2013, 2012, 2011, 2010, 2009 University of Chicago |
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Copyright (C) 2008, 2007, 2006, 2005 Gordon Kindlmann |
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Copyright (C) 2004, 2003, 2002, 2001, 2000, 1999, 1998 University of Utah |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public License |
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(LGPL) as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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The terms of redistributing and/or modifying this software also |
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include exceptions to the LGPL that facilitate static linking. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public License |
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along with this library; if not, write to Free Software Foundation, Inc., |
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "limn.h" |
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int |
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limnObjectRender(limnObject *obj, limnCamera *cam, limnWindow *win) { |
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static const char me[]="limnObjectRender"; |
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int E; |
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E = 0; |
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if (!E) E |= limnCameraUpdate(cam); |
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/* |
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fprintf(stderr, "%s: true up = %g %g %g\n", me, |
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-cam->V[0], -cam->V[1], -cam->V[2]); |
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fprintf(stderr, "%s: true right = %g %g %g\n", me, |
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cam->U[0], cam->U[1], cam->U[2]); |
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*/ |
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if (!E) E |= limnObjectWorldHomog(obj); |
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if (!E) E |= limnObjectFaceNormals(obj, limnSpaceWorld); |
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if (!E) E |= limnObjectSpaceTransform(obj, cam, win, limnSpaceView); |
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if (!E) E |= limnObjectSpaceTransform(obj, cam, win, limnSpaceScreen); |
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if (!E) E |= limnObjectFaceNormals(obj, limnSpaceScreen); |
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if (!E) E |= limnObjectSpaceTransform(obj, cam, win, limnSpaceDevice); |
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if (E) { |
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biffAddf(LIMN, "%s: trouble", me); |
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return 1; |
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} |
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return 0; |
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} |
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void |
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_limnPSPreamble(limnObject *obj, limnCamera *cam, limnWindow *win) { |
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AIR_UNUSED(obj); |
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AIR_UNUSED(cam); |
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fprintf(win->file, "%%!PS-Adobe-2.0 EPSF-2.0\n"); |
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fprintf(win->file, "%%%%Creator: limn\n"); |
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fprintf(win->file, "%%%%Pages: 1\n"); |
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fprintf(win->file, "%%%%BoundingBox: %d %d %d %d\n", |
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(int)(win->bbox[0]), |
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(int)(win->bbox[1]), |
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(int)(win->bbox[2]), |
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(int)(win->bbox[3])); |
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fprintf(win->file, "%%%%EndComments\n"); |
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fprintf(win->file, "%%%%EndProlog\n"); |
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fprintf(win->file, "%%%%Page: 1 1\n"); |
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fprintf(win->file, "gsave\n"); |
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fprintf(win->file, "%g %g moveto\n", win->bbox[0], win->bbox[1]); |
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fprintf(win->file, "%g %g lineto\n", win->bbox[2], win->bbox[1]); |
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fprintf(win->file, "%g %g lineto\n", win->bbox[2], win->bbox[3]); |
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fprintf(win->file, "%g %g lineto\n", win->bbox[0], win->bbox[3]); |
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fprintf(win->file, "closepath\n"); |
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if (!win->ps.noBackground) { |
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fprintf(win->file, "gsave %g %g %g setrgbcolor fill grestore\n", |
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win->ps.bg[0], win->ps.bg[1], win->ps.bg[2]); |
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} |
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fprintf(win->file, "clip\n"); |
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fprintf(win->file, "gsave newpath\n"); |
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fprintf(win->file, "1 setlinejoin\n"); |
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fprintf(win->file, "1 setlinecap\n"); |
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fprintf(win->file, "/M {moveto} bind def\n"); |
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fprintf(win->file, "/L {lineto} bind def\n"); |
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fprintf(win->file, "/W {setlinewidth} bind def\n"); |
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fprintf(win->file, "/F {fill} bind def\n"); |
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fprintf(win->file, "/S {stroke} bind def\n"); |
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fprintf(win->file, "/CP {closepath} bind def\n"); |
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fprintf(win->file, "/RGB {setrgbcolor} bind def\n"); |
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fprintf(win->file, "/Gr {setgray} bind def\n"); |
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fprintf(win->file, "\n"); |
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} |
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void |
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_limnPSEpilogue(limnObject *obj, limnCamera *cam, limnWindow *win) { |
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AIR_UNUSED(obj); |
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AIR_UNUSED(cam); |
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fprintf(win->file, "grestore\n"); |
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fprintf(win->file, "grestore\n"); |
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if (win->ps.showpage) { |
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fprintf(win->file, "showpage\n"); |
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} |
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fprintf(win->file, "%%%%Trailer\n"); |
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} |
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void |
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_limnPSDrawFace(limnObject *obj, limnFace *face, |
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limnCamera *cam, Nrrd *nmap, limnWindow *win) { |
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/* static const char me[]="_limnPSDrawFace"; */ |
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unsigned int vii; |
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limnVertex *vert; |
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limnLook *look; |
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int qn; |
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float *map, R, G, B; |
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AIR_UNUSED(cam); |
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look = obj->look + face->lookIdx; |
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for (vii=0; vii<face->sideNum; vii++) { |
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vert = obj->vert + face->vertIdx[vii]; |
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fprintf(win->file, "%g %g %s\n", |
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vert->coord[0], vert->coord[1], vii ? "L" : "M"); |
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} |
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R = look->kads[0]*look->rgba[0]; |
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G = look->kads[0]*look->rgba[1]; |
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B = look->kads[0]*look->rgba[2]; |
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if (nmap) { |
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qn = limnVtoQN_f[limnQN16octa](face->worldNormal); |
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map = (float *)nmap->data; |
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R += look->kads[1]*look->rgba[0]*map[0 + 3*qn]; |
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G += look->kads[1]*look->rgba[1]*map[1 + 3*qn]; |
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B += look->kads[1]*look->rgba[2]*map[2 + 3*qn]; |
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} else { |
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R += look->kads[1]*look->rgba[0]; |
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G += look->kads[1]*look->rgba[1]; |
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B += look->kads[1]*look->rgba[2]; |
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} |
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/* HEY: not evaluating phong specular for now */ |
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R = AIR_CLAMP(0, R, 1); |
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G = AIR_CLAMP(0, G, 1); |
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B = AIR_CLAMP(0, B, 1); |
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if (0 && R == G && G == B) { |
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/* As of Sat Mar 1 23:06:14 CST 2014 some version of ghostscript |
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and/or imagemagick will assign (when rasterizing) different |
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colors for RGB color (g,g,g) and graylevel g, which caused |
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strange appearance bugs that were hard to track down. Even if |
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there's a way of preventing this from happening with the right |
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incantation in the EPS header, for now it is simpler to forego |
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the small economy implemented here */ |
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fprintf(win->file, "CP %g Gr F\n", R); |
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} |
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else { |
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fprintf(win->file, "CP %g %g %g RGB F\n", R, G, B); |
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} |
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} |
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void |
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_limnPSDrawEdge(limnObject *obj, limnEdge *edge, |
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limnCamera *cam, limnWindow *win) { |
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limnVertex *vert0, *vert1; |
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float R, G, B; |
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AIR_UNUSED(cam); |
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if (win->ps.lineWidth[edge->type]) { |
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vert0 = obj->vert + edge->vertIdx[0]; |
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vert1 = obj->vert + edge->vertIdx[1]; |
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fprintf(win->file, "%g %g M ", vert0->coord[0], vert0->coord[1]); |
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fprintf(win->file, "%g %g L ", vert1->coord[0], vert1->coord[1]); |
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fprintf(win->file, "%g W ", win->ps.lineWidth[edge->type]); |
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R = win->ps.edgeColor[0]; |
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G = win->ps.edgeColor[1]; |
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B = win->ps.edgeColor[2]; |
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if (R == G && G == B) { |
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fprintf(win->file, "%g Gr S\n", R); |
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} else { |
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fprintf(win->file, "%g %g %g RGB S\n", R, G, B); |
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} |
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} |
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} |
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/* |
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******** limnObjectPSDraw |
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** |
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** draws a "rendered" limn object to postscript. |
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** limnObjectRender MUST be called first. |
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** |
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** The current (feeble) justification for using an environment map is |
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** that its an expressive way of shading things based on surface |
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** normal, in a context where, if flat shading is all you have, |
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** correct specular lighting is not possible |
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*/ |
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int |
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limnObjectPSDraw(limnObject *obj, limnCamera *cam, |
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Nrrd *nmap, limnWindow *win) { |
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static const char me[]="limnObjectPSDraw"; |
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int inside; |
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float angle; |
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limnFace *face, *face0, *face1; unsigned int fii; |
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limnEdge *edge; unsigned int eii; |
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limnPart *part; unsigned int partIdx; |
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limnVertex *vert; unsigned int vii; |
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if (limnSpaceDevice != obj->vertSpace) { |
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biffAddf(LIMN, "%s: object's verts in %s (not %s) space", me, |
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airEnumStr(limnSpace, obj->vertSpace), |
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airEnumStr(limnSpace, limnSpaceDevice)); |
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return 1; |
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} |
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if (nmap) { |
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if (limnEnvMapCheck(nmap)) { |
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biffAddf(LIMN, "%s: trouble", me); |
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return 1; |
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} |
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} |
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limnObjectDepthSortParts(obj); |
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_limnPSPreamble(obj, cam, win); |
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for (partIdx=0; partIdx<obj->partNum; partIdx++) { |
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part = obj->part[partIdx]; |
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/* only draw the parts that are inside the field of view */ |
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inside = 0; |
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for (vii=0; vii<part->vertIdxNum; vii++) { |
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vert = obj->vert + part->vertIdx[vii]; |
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inside |= (AIR_IN_CL(win->bbox[0], vert->coord[0], win->bbox[2]) && |
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AIR_IN_CL(win->bbox[1], vert->coord[1], win->bbox[3])); |
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if (inside) { |
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/* at least vertex is in, we know we can't skip this part */ |
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break; |
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} |
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} |
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if (!inside) { |
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/* none of the vertices were in, we can skip this part */ |
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continue; |
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} |
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/* draw the part */ |
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if (1 == part->edgeIdxNum) { |
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/* this part is just one lone edge */ |
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/* HEY: this is a mess */ |
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/* |
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e = &(obj->e[r->eBase]); |
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widthTmp = win->ps.lineWidth[e->type]; |
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fprintf(win->file, "%g setgray\n", 1 - win->ps.bg[0]); |
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win->ps.edgeWidth[e->type] = 8; |
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_limnPSDrawEdge(obj, r, e, cam, win); |
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fprintf(win->file, "%g %g %g RGB\n", |
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r->rgba[0], r->rgba[1], r->rgba[2]); |
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win->ps.edgeWidth[e->visible] = 4; |
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_limnPSDrawEdge(obj, r, e, cam, win); |
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win->ps.edgeWidth[e->visible] = widthTmp; |
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*/ |
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} else { |
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/* this part is either a lone face or a solid: |
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draw the front-facing, shaded faces */ |
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for (fii=0; fii<part->faceIdxNum; fii++) { |
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face = obj->face + part->faceIdx[fii]; |
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/* The consequence of having a left-handed frame is that world-space |
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CC-wise vertex traversal becomes C-wise screen-space traversal, so |
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all the normals are backwards of what we want */ |
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face->visible = (cam->rightHanded |
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? face->screenNormal[2] < 0 |
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: face->screenNormal[2] > 0); |
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if (face->sideNum == part->vertIdxNum && !face->visible) { |
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/* lone faces are always visible */ |
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face->visible = AIR_TRUE; |
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ELL_3V_SCALE(face->worldNormal, -1, face->worldNormal); |
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} |
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if (!win->ps.wireFrame && face->visible) { |
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_limnPSDrawFace(obj, face, cam, nmap, win); |
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} |
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} |
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/* draw ALL edges */ |
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for (eii=0; eii<part->edgeIdxNum; eii++) { |
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/* hack to change contour of particular object/glyph |
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if (24 == partIdx) { |
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win->ps.lineWidth[limnEdgeTypeContour] = 1.2; |
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} else { |
282 |
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win->ps.lineWidth[limnEdgeTypeContour] = 0.4; |
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} |
284 |
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*/ |
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edge = obj->edge + part->edgeIdx[eii]; |
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face0 = obj->face + edge->faceIdx[0]; |
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face1 = (-1 == edge->faceIdx[1] |
288 |
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? NULL |
289 |
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: obj->face + edge->faceIdx[1]); |
290 |
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if (!face1) { |
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edge->type = limnEdgeTypeBorder; |
292 |
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} else { |
293 |
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angle = AIR_CAST(float, |
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180/AIR_PI*acos(ELL_3V_DOT(face0->worldNormal, |
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face1->worldNormal))); |
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if (face0->visible && face1->visible) { |
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edge->type = (angle > win->ps.creaseAngle |
298 |
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? limnEdgeTypeFrontCrease |
299 |
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: limnEdgeTypeFrontFacet); |
300 |
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} else if (face0->visible ^ face1->visible) { |
301 |
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edge->type = limnEdgeTypeContour; |
302 |
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} else { |
303 |
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edge->type = (angle > win->ps.creaseAngle |
304 |
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? limnEdgeTypeBackCrease |
305 |
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: limnEdgeTypeBackFacet); |
306 |
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} |
307 |
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} |
308 |
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_limnPSDrawEdge(obj, edge, cam, win); |
309 |
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} |
310 |
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} |
311 |
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} |
312 |
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313 |
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_limnPSEpilogue(obj, cam, win); |
314 |
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|
315 |
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return 0; |
316 |
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} |
317 |
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|
318 |
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/* |
319 |
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******** limnObjectPSDrawConcave |
320 |
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** |
321 |
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** new version of the above, which works per-face instead of per-part, |
322 |
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** thus better handling self-occlusions, but at the cost of not getting |
323 |
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** contours near oblique faces correct... |
324 |
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*/ |
325 |
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int |
326 |
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limnObjectPSDrawConcave(limnObject *obj, limnCamera *cam, |
327 |
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Nrrd *nmap, limnWindow *win) { |
328 |
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static const char me[]="limnObjectPSDrawConcave"; |
329 |
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float angle; |
330 |
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limnPart *part; |
331 |
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limnFace *face, *face0, *face1; unsigned int faceIdx; |
332 |
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limnEdge *edge; unsigned int edgeIdx, eii; |
333 |
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|
334 |
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if (limnSpaceDevice != obj->vertSpace) { |
335 |
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biffAddf(LIMN, "%s: object's verts in %s (not %s) space", me, |
336 |
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airEnumStr(limnSpace, obj->vertSpace), |
337 |
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airEnumStr(limnSpace, limnSpaceDevice)); |
338 |
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return 1; |
339 |
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} |
340 |
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if (nmap) { |
341 |
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if (limnEnvMapCheck(nmap)) { |
342 |
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biffAddf(LIMN, "%s: trouble", me); |
343 |
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return 1; |
344 |
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} |
345 |
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} |
346 |
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347 |
|
|
limnObjectDepthSortFaces(obj); |
348 |
|
|
|
349 |
|
|
_limnPSPreamble(obj, cam, win); |
350 |
|
|
|
351 |
|
|
/* set every face's visibility */ |
352 |
|
|
for (faceIdx=0; faceIdx<obj->faceNum; faceIdx++) { |
353 |
|
|
face = obj->face + faceIdx; |
354 |
|
|
part = obj->part[face->partIdx]; |
355 |
|
|
face->visible = (cam->rightHanded |
356 |
|
|
? face->screenNormal[2] < 0 |
357 |
|
|
: face->screenNormal[2] > 0); |
358 |
|
|
if (face->sideNum == part->vertIdxNum && !face->visible) { |
359 |
|
|
/* lone faces are always visible */ |
360 |
|
|
face->visible = AIR_TRUE; |
361 |
|
|
ELL_3V_SCALE(face->worldNormal, -1, face->worldNormal); |
362 |
|
|
} |
363 |
|
|
} |
364 |
|
|
|
365 |
|
|
/* categorize all edges by traversing edge array, and looking |
366 |
|
|
at each of their two faces */ |
367 |
|
|
for (edgeIdx=0; edgeIdx<obj->edgeNum; edgeIdx++) { |
368 |
|
|
edge = obj->edge + edgeIdx; |
369 |
|
|
part = obj->part[edge->partIdx]; |
370 |
|
|
face0 = obj->face + edge->faceIdx[0]; |
371 |
|
|
face1 = (-1 == edge->faceIdx[1] |
372 |
|
|
? NULL |
373 |
|
|
: obj->face + edge->faceIdx[1]); |
374 |
|
|
if (!face1) { |
375 |
|
|
edge->type = limnEdgeTypeBorder; |
376 |
|
|
} else { |
377 |
|
|
angle = AIR_CAST(float, 180/AIR_PI*acos(ELL_3V_DOT(face0->worldNormal, |
378 |
|
|
face1->worldNormal))); |
379 |
|
|
if (face0->visible && face1->visible) { |
380 |
|
|
edge->type = (angle > win->ps.creaseAngle |
381 |
|
|
? limnEdgeTypeFrontCrease |
382 |
|
|
: limnEdgeTypeFrontFacet); |
383 |
|
|
} else if (face0->visible ^ face1->visible) { |
384 |
|
|
edge->type = limnEdgeTypeContour; |
385 |
|
|
} else { |
386 |
|
|
edge->type = (angle > win->ps.creaseAngle |
387 |
|
|
? limnEdgeTypeBackCrease |
388 |
|
|
: limnEdgeTypeBackFacet); |
389 |
|
|
} |
390 |
|
|
} |
391 |
|
|
} |
392 |
|
|
|
393 |
|
|
/* draw front-faces and their edges |
394 |
|
|
(contours, front crease, front non-crease) */ |
395 |
|
|
for (faceIdx=0; faceIdx<obj->faceNum; faceIdx++) { |
396 |
|
|
face = obj->faceSort[faceIdx]; |
397 |
|
|
part = obj->part[face->partIdx]; |
398 |
|
|
if (!face->visible) { |
399 |
|
|
continue; |
400 |
|
|
} |
401 |
|
|
if (!win->ps.wireFrame) { |
402 |
|
|
_limnPSDrawFace(obj, face, cam, nmap, win); |
403 |
|
|
} |
404 |
|
|
/* draw those edges around the face that won't be seen again by |
405 |
|
|
future faces in the depth-first traversal */ |
406 |
|
|
for (eii=0; eii<face->sideNum; eii++) { |
407 |
|
|
edge = obj->edge + face->edgeIdx[eii]; |
408 |
|
|
if (limnEdgeTypeContour == edge->type) { |
409 |
|
|
_limnPSDrawEdge(obj, edge, cam, win); |
410 |
|
|
} else if (limnEdgeTypeFrontCrease == edge->type |
411 |
|
|
|| limnEdgeTypeFrontFacet == edge->type) { |
412 |
|
|
if (edge->once) { |
413 |
|
|
/* its been seen once already, okay to draw */ |
414 |
|
|
_limnPSDrawEdge(obj, edge, cam, win); |
415 |
|
|
edge->once = AIR_FALSE; |
416 |
|
|
} else { |
417 |
|
|
/* we're the first to see it, and we're not the last, don't draw */ |
418 |
|
|
edge->once = AIR_TRUE; |
419 |
|
|
} |
420 |
|
|
} |
421 |
|
|
} |
422 |
|
|
} |
423 |
|
|
|
424 |
|
|
_limnPSEpilogue(obj, cam, win); |
425 |
|
|
|
426 |
|
|
return 0; |
427 |
|
|
} |