egg-make-tube

pandatool/src/eggbase/Sources.pp

@@ -8,19 +8,24 @@
   #define COMBINED_SOURCES $[TARGET]_composite1.cxx     
 
   #define SOURCES \
-     eggBase.h eggConverter.h eggFilter.h eggMultiBase.h \
-     eggMultiFilter.h eggReader.h eggSingleBase.h \
+     eggBase.h eggConverter.h eggFilter.h \
+     eggMakeSomething.h \
+     eggMultiBase.h eggMultiFilter.h \
+     eggReader.h eggSingleBase.h \
      eggToSomething.h eggWriter.h \
      somethingToEgg.h 
     
   #define INCLUDED_SOURCES \
-     eggBase.cxx eggConverter.cxx eggFilter.cxx eggMultiBase.cxx \
+     eggBase.cxx eggConverter.cxx eggFilter.cxx \
+     eggMakeSomething.cxx \
+     eggMultiBase.cxx \
      eggMultiFilter.cxx eggReader.cxx eggSingleBase.cxx \
      eggToSomething.cxx \
      eggWriter.cxx somethingToEgg.cxx 
 
   #define INSTALL_HEADERS \
     eggBase.h eggConverter.h eggFilter.h \
+    eggMakeSomething.h \
     eggMultiBase.h eggMultiFilter.h \
     eggReader.h eggSingleBase.h eggToSomething.h eggWriter.h somethingToEgg.h
 

pandatool/src/eggbase/eggMakeSomething.cxx

@@ -0,0 +1,33 @@
+// Filename: eggMakeSomething.cxx
+// Created by:  drose (01Oct03)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
+//
+// All use of this software is subject to the terms of the Panda 3d
+// Software license.  You should have received a copy of this license
+// along with this source code; you will also find a current copy of
+// the license at http://www.panda3d.org/license.txt .
+//
+// To contact the maintainers of this program write to
+// panda3d@yahoogroups.com .
+//
+////////////////////////////////////////////////////////////////////
+
+#include "eggMakeSomething.h"
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggMakeSomething::Constructor
+//       Access: Public
+//  Description: 
+////////////////////////////////////////////////////////////////////
+EggMakeSomething::
+EggMakeSomething() :
+  EggWriter(true, true)
+{
+  add_normals_options();
+  add_transform_options();
+}
+

pandatool/src/eggbase/eggMakeSomething.h

@@ -0,0 +1,37 @@
+// Filename: eggMakeSomething.h
+// Created by:  drose (01Oct03)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
+//
+// All use of this software is subject to the terms of the Panda 3d
+// Software license.  You should have received a copy of this license
+// along with this source code; you will also find a current copy of
+// the license at http://www.panda3d.org/license.txt .
+//
+// To contact the maintainers of this program write to
+// panda3d@yahoogroups.com .
+//
+////////////////////////////////////////////////////////////////////
+
+#ifndef EGGMAKESOMETHING_H
+#define EGGMAKESOMETHING_H
+
+#include "pandatoolbase.h"
+
+#include "eggWriter.h"
+
+////////////////////////////////////////////////////////////////////
+//       Class : EggMakeSomething
+// Description : A base class for a family of programs that generate
+//               egg models of various fundamental shapes.
+////////////////////////////////////////////////////////////////////
+class EggMakeSomething : public EggWriter {
+public:
+  EggMakeSomething();
+};
+
+#endif
+

pandatool/src/eggbase/eggbase_composite1.cxx

@@ -2,6 +2,7 @@
 #include "eggBase.cxx"
 #include "eggConverter.cxx"
 #include "eggFilter.cxx"
+#include "eggMakeSomething.cxx"
 #include "eggMultiBase.cxx"
 #include "eggMultiFilter.cxx"
 #include "eggReader.cxx"

pandatool/src/eggprogs/Sources.pp

@@ -31,6 +31,14 @@
 
 #end bin_target
 
+#begin bin_target
+  #define TARGET egg-make-tube
+
+  #define SOURCES \
+    eggMakeTube.cxx eggMakeTube.h
+
+#end bin_target
+
 #begin bin_target
   #define LOCAL_LIBS eggcharbase $[LOCAL_LIBS]
   #define TARGET egg-topstrip

pandatool/src/eggprogs/eggMakeTube.cxx

@@ -0,0 +1,272 @@
+// Filename: eggMakeTube.cxx
+// Created by:  drose (01Oct03)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
+//
+// All use of this software is subject to the terms of the Panda 3d
+// Software license.  You should have received a copy of this license
+// along with this source code; you will also find a current copy of
+// the license at http://www.panda3d.org/license.txt .
+//
+// To contact the maintainers of this program write to
+// panda3d@yahoogroups.com .
+//
+////////////////////////////////////////////////////////////////////
+
+#include "eggMakeTube.h"
+#include "eggGroup.h"
+#include "eggVertexPool.h"
+#include "eggVertex.h"
+#include "eggPolygon.h"
+#include "pointerTo.h"
+#include "look_at.h"
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggMakeTube::Constructor
+//       Access: Public
+//  Description: 
+////////////////////////////////////////////////////////////////////
+EggMakeTube::
+EggMakeTube() {
+  add_option
+    ("a", "x,y,z", 0, 
+     "Specify the first endpoint of the tube.",
+     &EggWriter::dispatch_double_triple, NULL, _point_a);
+
+  add_option
+    ("b", "x,y,z", 0, 
+     "Specify the second endpoint of the tube.",
+     &EggWriter::dispatch_double_triple, NULL, _point_a);
+
+  add_option
+    ("r", "radius", 0, 
+     "Specify the radius of the tube.  The tube will extend beyond "
+     "the endpoints in each direction by the amount of radius.",
+     &EggWriter::dispatch_double, NULL, &_radius);
+
+  add_option
+    ("slices", "count", 0, 
+     "Specify the number of slices appearing radially around the tube.",
+     &EggWriter::dispatch_int, NULL, &_num_slices);
+
+  add_option
+    ("crings", "count", 0, 
+     "Specify the number of rings appearing in each endcap of the tube.",
+     &EggWriter::dispatch_int, NULL, &_num_crings);
+
+  add_option
+    ("trings", "count", 0, 
+     "Specify the number of rings appearing in the cylindrical body "
+     "of the tube.",
+     &EggWriter::dispatch_int, NULL, &_num_trings);
+
+  _point_a[0] = 0.0;
+  _point_a[1] = 0.0;
+  _point_a[2] = 0.0;
+
+  _point_b[0] = 0.0;
+  _point_b[1] = 0.0;
+  _point_b[2] = 0.0;
+
+  _radius = 1.0;
+
+  _num_slices = 8;
+  _num_crings = 4;
+  _num_trings = 1;
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggMakeTube::run
+//       Access: Public
+//  Description:
+////////////////////////////////////////////////////////////////////
+void EggMakeTube::
+run() {
+  // We will generate the vertices in the canonical space (along the y
+  // axis), then transform it to the desired point.
+  LVector3d direction(_point_b[0] - _point_a[0],
+                      _point_b[1] - _point_a[1],
+                      _point_b[2] - _point_a[2]);
+  _length = direction.length();
+
+  // First, create an enclosing group and a vertex pool.
+  _group = new EggGroup("tube");
+  _data.add_child(_group);
+
+  _vpool = new EggVertexPool("tube");
+  _group->add_child(_vpool);
+
+  // Generate the first endcap.
+  int ri, si;
+  EggVertex *vtx_1;
+  EggVertex *vtx_2;
+
+  for (ri = 0; ri < _num_crings; ri++) {
+    vtx_1 = NULL;
+    vtx_2 = NULL;
+    for (si = 0; si <= _num_slices; si++) {
+      EggVertex *vtx_3 = calc_sphere1_vertex(ri, si);
+      EggVertex *vtx_4 = calc_sphere1_vertex(ri + 1, si);
+      add_polygon(vtx_1, vtx_2, vtx_4, vtx_3);
+      vtx_1 = vtx_3;
+      vtx_2 = vtx_4;
+    }
+  }
+
+  // Now the cylinder sides.
+  for (ri = 0; ri < _num_trings; ri++) {
+    vtx_1 = NULL;
+    vtx_2 = NULL;
+    for (si = 0; si <= _num_slices; si++) {
+      EggVertex *vtx_3 = calc_tube_vertex(ri, si);
+      EggVertex *vtx_4 = calc_tube_vertex(ri + 1, si);
+      add_polygon(vtx_1, vtx_2, vtx_4, vtx_3);
+      vtx_1 = vtx_3;
+      vtx_2 = vtx_4;
+    }
+  }
+
+  // And the second endcap.
+  for (ri = _num_crings - 1; ri >= 0; ri--) {
+    vtx_1 = NULL;
+    vtx_2 = NULL;
+    for (si = 0; si <= _num_slices; si++) {
+      EggVertex *vtx_3 = calc_sphere2_vertex(ri + 1, si);
+      EggVertex *vtx_4 = calc_sphere2_vertex(ri, si);
+      add_polygon(vtx_1, vtx_2, vtx_4, vtx_3);
+      vtx_1 = vtx_3;
+      vtx_2 = vtx_4;
+    }
+  }
+
+  // Now transform the vertices out of the canonical position.
+  LMatrix4d mat;
+  look_at(mat, direction, LVector3d(0.0, 0.0, 1.0), CS_zup_right);
+  mat.set_row(3, LPoint3d(_point_a[0], _point_a[1], _point_a[2]));
+  _group->transform(mat);
+
+  write_egg_file();
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggMakeTube::calc_sphere1_vertex
+//       Access: Private
+//  Description: Calculates a particular vertex on the surface of the
+//               first endcap hemisphere.
+////////////////////////////////////////////////////////////////////
+EggVertex *EggMakeTube::
+calc_sphere1_vertex(int ri, int si) {
+  double r = (double)ri / (double)_num_crings;
+  double s = (double)si / (double)_num_slices;
+
+  // Find the point on the rim, based on the slice.
+  double theta = s * 2.0 * MathNumbers::pi;
+  double x_rim = cos(theta);
+  double z_rim = sin(theta);
+
+  // Now pull that point in towards the pole, based on the ring.
+  double phi = r * 0.5 * MathNumbers::pi;
+  double to_pole = sin(phi);
+
+  double x = _radius * x_rim * to_pole;
+  double y = -_radius * cos(phi);
+  double z = _radius * z_rim * to_pole;
+
+  EggVertex vert;
+  vert.set_pos(LPoint3d(x, y, z));
+
+  return _vpool->create_unique_vertex(vert);
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggMakeTube::calc_tube_vertex
+//       Access: Private
+//  Description: Calculates a vertex on the side of the cylindrical
+//               body of the tube.
+////////////////////////////////////////////////////////////////////
+EggVertex *EggMakeTube::
+calc_tube_vertex(int ri, int si) {
+  double r = (double)ri / (double)_num_trings;
+  double s = (double)si / (double)_num_slices;
+
+  // Find the point on the rim, based on the slice.
+  double theta = s * 2.0 * MathNumbers::pi;
+  double x_rim = cos(theta);
+  double z_rim = sin(theta);
+
+  double x = _radius * x_rim;
+  double y = _length * r;
+  double z = _radius * z_rim;
+
+  EggVertex vert;
+  vert.set_pos(LPoint3d(x, y, z));
+
+  return _vpool->create_unique_vertex(vert);
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggMakeTube::calc_sphere2_vertex
+//       Access: Private
+//  Description: Calculates a particular vertex on the surface of the
+//               second endcap hemisphere.
+////////////////////////////////////////////////////////////////////
+EggVertex *EggMakeTube::
+calc_sphere2_vertex(int ri, int si) {
+  double r = (double)ri / (double)_num_crings;
+  double s = (double)si / (double)_num_slices;
+
+  // Find the point on the rim, based on the slice.
+  double theta = s * 2.0 * MathNumbers::pi;
+  double x_rim = cos(theta);
+  double z_rim = sin(theta);
+
+  // Now pull that point in towards the pole, based on the ring.
+  double phi = r * 0.5 * MathNumbers::pi;
+  double to_pole = sin(phi);
+
+  double x = _radius * x_rim * to_pole;
+  double y = _length + _radius * cos(phi);
+  double z = _radius * z_rim * to_pole;
+
+  EggVertex vert;
+  vert.set_pos(LPoint3d(x, y, z));
+
+  return _vpool->create_unique_vertex(vert);
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggMakeTube::add_polygon
+//       Access: Private
+//  Description: Adds the polygon defined by the indicated four
+//               vertices to the group.  If the first vertex is
+//               NULL, does nothing.
+////////////////////////////////////////////////////////////////////
+void EggMakeTube::
+add_polygon(EggVertex *a, EggVertex *b, EggVertex *c, EggVertex *d) {
+  if (a == (EggVertex *)NULL) {
+    return;
+  }
+
+  PT(EggPolygon) poly = new EggPolygon;
+  poly->add_vertex(a);
+  if (a != b) {
+    poly->add_vertex(b);
+  }
+  poly->add_vertex(c);
+  if (c != d) {
+    poly->add_vertex(d);
+  }
+
+  _group->add_child(poly.p());
+}
+
+
+int main(int argc, char *argv[]) {
+  EggMakeTube prog;
+  prog.parse_command_line(argc, argv);
+  prog.run();
+  return 0;
+}

pandatool/src/eggprogs/eggMakeTube.h

@@ -0,0 +1,61 @@
+// Filename: eggMakeTube.h
+// Created by:  drose (01Oct03)
+//
+////////////////////////////////////////////////////////////////////
+//
+// PANDA 3D SOFTWARE
+// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
+//
+// All use of this software is subject to the terms of the Panda 3d
+// Software license.  You should have received a copy of this license
+// along with this source code; you will also find a current copy of
+// the license at http://www.panda3d.org/license.txt .
+//
+// To contact the maintainers of this program write to
+// panda3d@yahoogroups.com .
+//
+////////////////////////////////////////////////////////////////////
+
+#ifndef EGGMAKETUBE_H
+#define EGGMAKETUBE_H
+
+#include "pandatoolbase.h"
+
+#include "eggMakeSomething.h"
+
+class EggGroup;
+class EggVertexPool;
+class EggVertex;
+
+////////////////////////////////////////////////////////////////////
+//       Class : EggMakeTube
+// Description : A program to generate an egg file representing a tube
+//               model, similar in shape to a CollisionTube.
+////////////////////////////////////////////////////////////////////
+class EggMakeTube : public EggMakeSomething {
+public:
+  EggMakeTube();
+
+  void run();
+
+private:
+  EggVertex *calc_sphere1_vertex(int ri, int si);
+  EggVertex *calc_sphere2_vertex(int ri, int si);
+  EggVertex *calc_tube_vertex(int ri, int si);
+  void add_polygon(EggVertex *a, EggVertex *b, EggVertex *c, EggVertex *d);
+
+private:
+  double _point_a[3];
+  double _point_b[3];
+  double _radius;
+  int _num_slices;
+  int _num_crings;
+  int _num_trings;
+
+  double _length;
+  EggGroup *_group;
+  EggVertexPool *_vpool;
+};
+
+#endif
+