Revision: 65132
http://sourceforge.net/p/brlcad/code/65132
Author: ejno
Date: 2015-06-01 17:57:05 +0000 (Mon, 01 Jun 2015)
Log Message:
-----------
detect bots representing CHEX1 components
Modified Paths:
--------------
brlcad/trunk/src/libgcv/conv/fastgen4/fastgen4_write.cpp
Modified: brlcad/trunk/src/libgcv/conv/fastgen4/fastgen4_write.cpp
===================================================================
--- brlcad/trunk/src/libgcv/conv/fastgen4/fastgen4_write.cpp 2015-06-01
16:44:57 UTC (rev 65131)
+++ brlcad/trunk/src/libgcv/conv/fastgen4/fastgen4_write.cpp 2015-06-01
17:57:05 UTC (rev 65132)
@@ -1020,6 +1020,81 @@
}
+// Determines whether `bot` is a CHEX1-compatible BOT
+// (typically created by the fastgen4 importer).
+//
+// Stores CHEX1 points in `points`.
+// Stores CHEX1 thickness in `thickness`.
+// Stores centering mode in `grid_centered`.
+HIDDEN bool
+bot_is_chex1(const rt_bot_internal &bot, fastf_t points[8][3],
+ fastf_t &thickness, bool &grid_centered)
+{
+ RT_BOT_CK_MAGIC(&bot);
+
+ if (bot.num_vertices != 8 || bot.num_faces != 12)
+ return false;
+
+ if (bot.mode == RT_BOT_SURFACE || bot.mode == RT_BOT_SOLID)
+ return false;
+
+ if (bot.thickness) {
+ thickness = bot.thickness[0];
+
+ for (std::size_t i = 1; i < bot.num_faces; ++i)
+ if (!EQUAL(bot.thickness[i], thickness))
+ return false;
+ }
+
+ if (bot.face_mode) {
+ const bool face_mode = BU_BITTEST(bot.face_mode, 0);
+ grid_centered = !face_mode;
+
+ std::size_t count = 0;
+ BU_BITV_LOOP_START(bot.face_mode) {
+ ++count;
+ }
+ BU_BITV_LOOP_END;
+
+ if (face_mode) {
+ if (count != bot.num_faces)
+ return false;
+ } else {
+ if (count)
+ return false;
+ }
+ }
+
+ const int hex_faces[12][3] = {
+ { 0, 1, 4 },
+ { 1, 5, 4 },
+ { 1, 2, 5 },
+ { 2, 6, 5 },
+ { 2, 3, 6 },
+ { 3, 7, 6 },
+ { 3, 0, 7 },
+ { 0, 4, 7 },
+ { 4, 6, 7 },
+ { 4, 5, 6 },
+ { 0, 1, 2 },
+ { 0, 2, 3 }
+ };
+
+ for (int i = 0; i < 12; ++i) {
+ const int *face = &bot.faces[i * 3];
+
+ if (face[0] != hex_faces[i][0] || face[1] != hex_faces[i][1]
+ || face[2] != hex_faces[i][2])
+ return false;
+ }
+
+ for (int i = 0; i < 8; ++i)
+ VMOVE(points[i], &bot.vertices[i * 3]);
+
+ return true;
+}
+
+
struct ConversionData {
FastgenWriter &m_writer;
const bn_tol &m_tol;
@@ -1110,6 +1185,20 @@
const rt_bot_internal &bot = *static_cast<rt_bot_internal
*>(internal.idb_ptr);
RT_BOT_CK_MAGIC(&bot);
+ {
+ fastf_t points[8][3];
+ fastf_t thickness;
+ bool grid_centered;
+
+ if (bot_is_chex1(bot, points, thickness, grid_centered)) {
+ Section section(name, true);
+ section.add(new Section::Hexahedron(section, name, points,
thickness,
+ grid_centered));
+ section.write(data.m_writer);
+ break;
+ }
+ }
+
Section section(name, bot.mode == RT_BOT_SOLID);
write_bot(section, bot);
section.write(data.m_writer);
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