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more support for three collinear points

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This commit is contained in:
David Rose 2003-06-05 22:35:50 +00:00
parent a5ad0969d4
commit 63db1b1d1c
2 changed files with 43 additions and 7 deletions
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49
panda/src/collide/collisionPolygon.cxx
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@ -193,7 +193,40 @@ get_collision_origin() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
void CollisionPolygon:: void CollisionPolygon::
output(ostream &out) const { output(ostream &out) const {
out << "cpolygon"; out << "cpolygon, (" << get_plane()
<< "), ";
switch (_axis) {
case AT_x:
out << "x-aligned, ";
break;
case AT_y:
out << "y-aligned, ";
break;
case AT_z:
out << "z-aligned, ";
break;
}
out << _points.size() << " vertices";
if (_reversed){
out << " (reversed)";
}
}
////////////////////////////////////////////////////////////////////
// Function: CollisionPolygon::write
// Access: Public, Virtual
// Description:
////////////////////////////////////////////////////////////////////
void CollisionPolygon::
write(ostream &out, int indent_level) const {
indent(out, indent_level) << (*this) << "\n";
Points::const_iterator pi;
for (pi = _points.begin(); pi != _points.end(); ++pi) {
indent(out, indent_level + 2) << (*pi) << "\n";
}
} }
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
@ -607,14 +640,16 @@ setup_points(const LPoint3f *begin, const LPoint3f *end) {
// Tell the base CollisionPlane class what its plane will be. We // Tell the base CollisionPlane class what its plane will be. We
// can determine this from the first three 3-d points (unless these // can determine this from the first three 3-d points (unless these
// first three points happen to be collinear). // first three points happen to be collinear).
bool got_normal = false; int first_p = 2;
for (int i = 2; i < num_points && !got_normal; i++) { while (first_p < num_points) {
Planef plane(begin[0], begin[1], begin[2]); Planef plane(begin[0], begin[1], begin[first_p]);
got_normal = (plane.get_normal().length_squared() > 0.1); if (plane.get_normal().length_squared() > 0.1) {
if (got_normal) {
set_plane(plane); set_plane(plane);
break;
} }
first_p++;
} }
nassertv(first_p < num_points);
LVector3f normal = get_normal(); LVector3f normal = get_normal();
@ -720,7 +755,7 @@ setup_points(const LPoint3f *begin, const LPoint3f *end) {
// One final complication: In projecting the polygon onto the plane, // One final complication: In projecting the polygon onto the plane,
// we might have lost its counterclockwise-vertex orientation. If // we might have lost its counterclockwise-vertex orientation. If
// this is the case, we must reverse the order of the vertices. // this is the case, we must reverse the order of the vertices.
_reversed = is_right(_points[2] - _points[0], _points[1] - _points[0]); _reversed = is_right(_points[first_p] - _points[0], _points[1] - _points[0]);
if (_reversed) { if (_reversed) {
reverse(_points.begin(), _points.end()); reverse(_points.begin(), _points.end());
} }

1
panda/src/collide/collisionPolygon.h
View File

@ -53,6 +53,7 @@ public:
virtual LPoint3f get_collision_origin() const; virtual LPoint3f get_collision_origin() const;
virtual void output(ostream &out) const; virtual void output(ostream &out) const;
virtual void write(ostream &out, int indent_level = 0) const;
protected: protected:
INLINE CollisionPolygon(void); INLINE CollisionPolygon(void);