josh/fart
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

cleaning up shapes/Cyl a bit

Browse Source 
git-svn-id: svn://anubis/fart/trunk@190 7f9b0f55-74a9-4bce-be96-3c2cd072584d
This commit is contained in:
Josh Holtrop 2009-03-07 19:17:47 +00:00
parent feeaa34d62
commit 1ad08d9998
2 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
shapes/Cyl.cc
View File

@ -17,6 +17,8 @@ Cyl::Cyl(double bottom_radius, double top_radius, double height)
if (m_height == 0.0)
m_height = 1.0;
m_slope = (m_top_radius - m_bottom_radius) / m_height; /* rise over run */
if ( ! FP_EQUAL(m_slope, 0.0) )
m_inv_slope = -1.0 / m_slope;
}
Shape::IntersectionList Cyl::intersect(refptr<Shape> _this, const Ray & ray)
@ -34,7 +36,7 @@ Shape::IntersectionList Cyl::intersect(refptr<Shape> _this, const Ray & ray)
{
Vector isect_point = ray_inv[solutions.results[0]];
if (isect_point[0]*isect_point[0] + isect_point[1]*isect_point[1]
< m_bottom_radius_2)
<= m_bottom_radius_2)
{
res.add(Intersection(_this,
m_transform.transform_point(isect_point)));
@ -52,7 +54,7 @@ Shape::IntersectionList Cyl::intersect(refptr<Shape> _this, const Ray & ray)
{
Vector isect_point = ray_inv[solutions.results[0]];
if (isect_point[0]*isect_point[0] + isect_point[1]*isect_point[1]
< m_top_radius_2)
<= m_top_radius_2)
{
res.add(Intersection(_this,
m_transform.transform_point(isect_point)));
@ -97,7 +99,7 @@ Shape::IntersectionList Cyl::intersect(refptr<Shape> _this, const Ray & ray)
if (solutions.results[i] >= 0.0)
{
Vector isect_point = ray_inv[solutions.results[i]];
if (isect_point[2] >= 0.0 && isect_point[2] <= m_height)
if (isect_point[2] > 0.0 && isect_point[2] < m_height)
{
res.add(Intersection(_this,
m_transform.transform_point(isect_point)));
@ -124,19 +126,25 @@ Vector Cyl::getNormalAt(const Vector & pt)
}
else
{
if (m_slope == 0.0)
if ( FP_EQUAL(m_slope, 0.0) )
{
normal = Vector(local_pt[0], local_pt[1], 0.0);
normal.normalize();
}
else
{
double norm_slope = -1.0 / m_slope;
double z = sqrt(local_pt[0]*local_pt[0] + local_pt[1]*local_pt[1])
* norm_slope;
normal = Vector(local_pt[0], local_pt[1], z);
normal.normalize();
double x = local_pt[0];
double y = local_pt[1];
double dist = sqrt( local_pt[0] * local_pt[0]
+ local_pt[1] * local_pt[1] );
if (dist > 0.0)
{
double scale = 1.0 / dist;
x *= scale;
y *= scale;
}
normal = Vector(x, y, m_inv_slope);
}
normal.normalize();
}
return m_transform.transform_normal(normal);

1
shapes/Cyl.h
View File

@ -18,6 +18,7 @@ class Cyl : public Shape
double m_top_radius_2;
double m_height;
double m_slope;
double m_inv_slope;
};
#endif