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end caps on extrudes working!

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git-svn-id: svn://anubis/fart/trunk@279 7f9b0f55-74a9-4bce-be96-3c2cd072584d
This commit is contained in:
Josh Holtrop 2010-07-08 18:33:39 +00:00
parent da47ae6fd3
commit 53ebaeec3e
4 changed files with 42 additions and 7 deletions
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2
scenes/extrudes.fart
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@ -37,7 +37,7 @@ scene
<-3, -3>
<-1, -2>
<1, -4>
<2, -1>
<1, -1>
}
offset 3
material { color <1, 0.7, 0> }

8
shapes/Extrude.cc
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@ -83,7 +83,7 @@ Shape::IntersectionList Extrude::intersect(refptr<Shape> _this, const Ray & ray)
Vector ipoint = ray_inv[solutions.results[0]];
Polygon quad;
quad.add(p1).add(p2).add(p3).add(p4);
if (quad.containsPoint(ipoint))
if (quad.containsPointConvex(ipoint))
{
res.add(Intersection(_this,
m_transform.transform_point(ipoint),
@ -115,7 +115,7 @@ Shape::IntersectionList Extrude::intersect(refptr<Shape> _this, const Ray & ray)
for (int p = 0; p < n_polygons; p++)
{
refptr<Polygon> polygon = m_polygons[p];
if (polygon->containsPoint(ipoint))
if (polygon->containsPoint2D(ipoint))
{
res.add(Intersection(_this,
m_transform.transform_point(ipoint),
@ -126,7 +126,7 @@ Shape::IntersectionList Extrude::intersect(refptr<Shape> _this, const Ray & ray)
}
if (scale[0] > 0.0 && scale[1] > 0.0)
{
a = 0, b = 0, c = 1.0, d = distance;
a = 0, b = 0, c = 1.0, d = -distance;
if (ray_inv.getDirection() % Vector(a, b, c) < 0)
{
LinearSolver solver( a * ray_inv.getDirection()[0]
@ -148,7 +148,7 @@ Shape::IntersectionList Extrude::intersect(refptr<Shape> _this, const Ray & ray)
tp[i] = new Vector(tp[i]->mult(scale) + shift);
(*tp[i])[2] += distance;
}
if (tp.containsPoint(ipoint))
if (tp.containsPoint2D(ipoint))
{
res.add(Intersection(_this,
m_transform.transform_point(ipoint),

36
util/Polygon.cc
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@ -5,7 +5,41 @@
#define FP_EQUAL(x,y) (fabs((x)-(y)) < 1E-6)
bool Polygon::containsPoint(const Vector & v)
/*
* from http://local.wasp.uwa.edu.au/~pbourke/geometry/insidepoly/
* Return the angle between two vectors on a plane
* The angle is from vector 1 to vector 2, positive anticlockwise
* The result is between -pi -> pi
*/
double angle2D(double x1, double y1, double x2, double y2)
{
double dtheta, theta1, theta2;
theta1 = atan2(y1,x1);
theta2 = atan2(y2,x2);
dtheta = theta2 - theta1;
while (dtheta > M_PI)
dtheta -= 2.0 * M_PI;
while (dtheta < -M_PI)
dtheta += 2.0 * M_PI;
return dtheta;
}
bool Polygon::containsPoint2D(const Vector & v) const
{
double angle_sum = 0.0;
for (int i = 0, sz = size(); i < sz; i++)
{
Vector v1 = *(*this)[i] - v;
Vector v2 = *(*this)[(i+1) % sz] - v;
double angle = angle2D(v1[0], v1[1], v2[0], v2[1]);
angle_sum += angle;
}
return FP_EQUAL(angle_sum, 2.0 * M_PI);
}
bool Polygon::containsPointConvex(const Vector & v) const
{
double angle_sum = 0.0;
for (int i = 0, sz = size(); i < sz; i++)

3
util/Polygon.h
View File

@ -20,7 +20,8 @@ class Polygon : public std::vector< refptr<Vector> >
push_back(v);
return *this;
}
bool containsPoint(const Vector & v);
bool containsPoint2D(const Vector & v) const;
bool containsPointConvex(const Vector & v) const;
};
#endif