fly/flightgear
1
0
Fork 0
Code Activity

Fix a terrain intersection calculating bug. The code wasn't quite handling

Browse source 
traingle strips right ... it was mixing up the vertex ordering slightly.
Oh what the heck, it was really screwing up tristrips.  Everything else looks
correct though. :-)  Hurray for the red book.
This commit is contained in:
curt 2003-11-21 03:13:52 +00:00
parent c05a2c2bcc
commit 0f1c24bbed
1 changed files with 21 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

30
src/Scenery/hitlist.cxx
View file

@ -243,7 +243,11 @@ int FGHitList::IntersectLeaf( ssgLeaf *leaf, sgdMat4 m,
switch ( primType )
{
case GL_POLYGON :
SG_LOG( SG_TERRAIN, SG_ALERT,
"WARNING: dubiously handled GL_POLYGON" );
case GL_TRIANGLE_FAN :
/* SG_LOG( SG_TERRAIN, SG_ALERT,
"IntersectLeaf: GL_TRIANGLE_FAN" ); */
if ( !n ) {
sgdSetVec3( tri[0], leaf->getVertex( short(0) ) );
sgdSetVec3( tri[1], leaf->getVertex( short(1) ) );
@ -254,35 +258,42 @@ int FGHitList::IntersectLeaf( ssgLeaf *leaf, sgdMat4 m,
}
break;
case GL_TRIANGLES :
/* SG_LOG( SG_TERRAIN, SG_DEBUG,
"IntersectLeaf: GL_TRIANGLES" ); */
sgdSetVec3( tri[0], leaf->getVertex( short(n*3) ) );
sgdSetVec3( tri[1], leaf->getVertex( short(n*3+1) ) );
sgdSetVec3( tri[2], leaf->getVertex( short(n*3+2) ) );
break;
case GL_TRIANGLE_STRIP :
case GL_QUAD_STRIP :
SG_LOG( SG_TERRAIN, SG_ALERT,
"WARNING: dubiously handled GL_QUAD_STRIP" );
case GL_TRIANGLE_STRIP :
/* SG_LOG( SG_TERRAIN, SG_ALERT,
"IntersectLeaf: GL_TRIANGLE_STRIP" ); */
if ( !n ) {
sgdSetVec3( tri[0], leaf->getVertex( short(0) ) );
sgdSetVec3( tri[1], leaf->getVertex( short(1) ) );
sgdSetVec3( tri[2], leaf->getVertex( short(2) ) );
} else {
if ( n & 1 ) {
sgdSetVec3( tri[0], leaf->getVertex( short(n+2) ) );
sgdCopyVec3( tri[1], tri[2] );
sgdCopyVec3( tri[2], tri[1] );
sgdCopyVec3( tri[0], tri[2] );
sgdSetVec3( tri[2], leaf->getVertex( short(n+2) ) );
} else {
sgdCopyVec3( tri[0], tri[1] );
sgdCopyVec3( tri[1], tri[2] );
sgdCopyVec3( tri[2], tri[1] );
sgdSetVec3( tri[2], leaf->getVertex( short(n+2) ) );
}
}
break;
case GL_QUADS :
SG_LOG( SG_TERRAIN, SG_ALERT,
"WARNING: dubiously handled GL_QUADS" );
sgdSetVec3( tri[0], leaf->getVertex( short(n*2) ) );
sgdSetVec3( tri[1], leaf->getVertex( short(n*2+1) ) );
sgdSetVec3( tri[2], leaf->getVertex( short(n*2 + 2 - (n&1)*4) ) );
break;
default:
SG_LOG( SG_TERRAIN, SG_ALERT,
"WARNING: not-handled structure: " << primType );
return IntersectLeaf( leaf, m, orig, dir);
}
@ -519,14 +530,15 @@ bool fgCurrentElev( sgdVec3 abs_view_pos, sgdVec3 scenery_center,
double result = -9999;
Point3D sc(scenery_center[0], scenery_center[1], scenery_center[2]) ;
// cout << "hits = ";
int hitcount = hit_list->num_hits();
// cout << "hits = " << hitcount << endl;
for ( int i = 0; i < hitcount; ++i ) {
geoc = sgCartToPolar3d( sc + hit_list->get_point(i) );
double lat_geod, alt, sea_level_r;
sgGeocToGeod(geoc.lat(), geoc.radius(), &lat_geod,
&alt, &sea_level_r);
// cout << alt << " ";
// cout << "hit " << i << " lon = " << geoc.lon() << " lat = "
// << lat_geod << " alt = " << alt << endl;
if ( alt > result && alt < 10000 ) {
result = alt;
this_hit = i;