mirror of
https://github.com/ZDoom/Raze.git
synced 2024-12-11 13:21:49 +00:00
f7dd0ec4a2
As it turned out, the triangulator only works fine for regular polygons, but creates incomplete meshes for sectors with multiple sections or some degenerate areas, which are quite common with swinging doors. The node builder is more costly and creates wall splits, of course, but it does not create broken output for degenerate sectors so it's a good fallback.
135 lines
2.3 KiB
C++
135 lines
2.3 KiB
C++
#include "nodebuild.h"
|
|
|
|
#define FAR_ENOUGH 17179869184.f // 4<<32
|
|
|
|
int FNodeBuilder::ClassifyLine(node_t &node, const FPrivVert *v1, const FPrivVert *v2, int sidev[2])
|
|
{
|
|
double d_x1 = double(node.x);
|
|
double d_y1 = double(node.y);
|
|
double d_dx = double(node.dx);
|
|
double d_dy = double(node.dy);
|
|
double d_xv1 = double(v1->x);
|
|
double d_xv2 = double(v2->x);
|
|
double d_yv1 = double(v1->y);
|
|
double d_yv2 = double(v2->y);
|
|
|
|
double s_num1 = (d_y1 - d_yv1) * d_dx - (d_x1 - d_xv1) * d_dy;
|
|
double s_num2 = (d_y1 - d_yv2) * d_dx - (d_x1 - d_xv2) * d_dy;
|
|
|
|
int nears = 0;
|
|
|
|
if (s_num1 <= -FAR_ENOUGH)
|
|
{
|
|
if (s_num2 <= -FAR_ENOUGH)
|
|
{
|
|
sidev[0] = sidev[1] = 1;
|
|
return 1;
|
|
}
|
|
if (s_num2 >= FAR_ENOUGH)
|
|
{
|
|
sidev[0] = 1;
|
|
sidev[1] = -1;
|
|
return -1;
|
|
}
|
|
nears = 1;
|
|
}
|
|
else if (s_num1 >= FAR_ENOUGH)
|
|
{
|
|
if (s_num2 >= FAR_ENOUGH)
|
|
{
|
|
sidev[0] = sidev[1] = -1;
|
|
return 0;
|
|
}
|
|
if (s_num2 <= -FAR_ENOUGH)
|
|
{
|
|
sidev[0] = -1;
|
|
sidev[1] = 1;
|
|
return -1;
|
|
}
|
|
nears = 1;
|
|
}
|
|
else
|
|
{
|
|
nears = 2 | int(fabs(s_num2) < FAR_ENOUGH);
|
|
}
|
|
|
|
if (nears)
|
|
{
|
|
double l = 1.f / (d_dx*d_dx + d_dy*d_dy);
|
|
if (nears & 2)
|
|
{
|
|
double dist = s_num1 * s_num1 * l;
|
|
if (dist < SIDE_EPSILON*SIDE_EPSILON)
|
|
{
|
|
sidev[0] = 0;
|
|
}
|
|
else
|
|
{
|
|
sidev[0] = s_num1 > 0.0 ? -1 : 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
sidev[0] = s_num1 > 0.0 ? -1 : 1;
|
|
}
|
|
if (nears & 1)
|
|
{
|
|
double dist = s_num2 * s_num2 * l;
|
|
if (dist < SIDE_EPSILON*SIDE_EPSILON)
|
|
{
|
|
sidev[1] = 0;
|
|
}
|
|
else
|
|
{
|
|
sidev[1] = s_num2 > 0.0 ? -1 : 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
sidev[1] = s_num2 > 0.0 ? -1 : 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
sidev[0] = s_num1 > 0.0 ? -1 : 1;
|
|
sidev[1] = s_num2 > 0.0 ? -1 : 1;
|
|
}
|
|
|
|
if ((sidev[0] | sidev[1]) == 0)
|
|
{ // seg is coplanar with the splitter, so use its orientation to determine
|
|
// which child it ends up in. If it faces the same direction as the splitter,
|
|
// it goes in front. Otherwise, it goes in back.
|
|
|
|
if (node.dx != 0)
|
|
{
|
|
if ((node.dx > 0 && v2->x > v1->x) || (node.dx < 0 && v2->x < v1->x))
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ((node.dy > 0 && v2->y > v1->y) || (node.dy < 0 && v2->y < v1->y))
|
|
{
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
else if (sidev[0] <= 0 && sidev[1] <= 0)
|
|
{
|
|
return 0;
|
|
}
|
|
else if (sidev[0] >= 0 && sidev[1] >= 0)
|
|
{
|
|
return 1;
|
|
}
|
|
return -1;
|
|
}
|