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Allow server side occlusion culling.

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This commit is contained in:
Lars Hofhansl 2017-02-27 23:06:15 -08:00 • committed by Auke Kok
parent 6738c7e9a3
commit ba4b704ebf
7 changed files with 92 additions and 66 deletions
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66
src/map.cpp
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@ -1157,6 +1157,72 @@ void Map::removeNodeTimer(v3s16 p)
block->m_node_timers.remove(p_rel);
}
bool Map::isOccluded(v3s16 p0, v3s16 p1, float step, float stepfac,
float start_off, float end_off, u32 needed_count)
{
float d0 = (float)BS * p0.getDistanceFrom(p1);
v3s16 u0 = p1 - p0;
v3f uf = v3f(u0.X, u0.Y, u0.Z) * BS;
uf.normalize();
v3f p0f = v3f(p0.X, p0.Y, p0.Z) * BS;
u32 count = 0;
for(float s=start_off; s<d0+end_off; s+=step){
v3f pf = p0f + uf * s;
v3s16 p = floatToInt(pf, BS);
MapNode n = getNodeNoEx(p);
const ContentFeatures &f = m_nodedef->get(n);
if(f.drawtype == NDT_NORMAL){
// not transparent, see ContentFeature::updateTextures
count++;
if(count >= needed_count)
return true;
}
step *= stepfac;
}
return false;
}
bool Map::isBlockOccluded(MapBlock *block, v3s16 cam_pos_nodes) {
v3s16 cpn = block->getPos() * MAP_BLOCKSIZE;
cpn += v3s16(MAP_BLOCKSIZE / 2, MAP_BLOCKSIZE / 2, MAP_BLOCKSIZE / 2);
float step = BS * 1;
float stepfac = 1.1;
float startoff = BS * 1;
// The occlusion search of 'isOccluded()' must stop short of the target
// point by distance 'endoff' (end offset) to not enter the target mapblock.
// For the 8 mapblock corners 'endoff' must therefore be the maximum diagonal
// of a mapblock, because we must consider all view angles.
// sqrt(1^2 + 1^2 + 1^2) = 1.732
float endoff = -BS * MAP_BLOCKSIZE * 1.732050807569;
v3s16 spn = cam_pos_nodes;
s16 bs2 = MAP_BLOCKSIZE / 2 + 1;
// to reduce the likelihood of falsely occluded blocks
// require at least two solid blocks
// this is a HACK, we should think of a more precise algorithm
u32 needed_count = 2;
return (
// For the central point of the mapblock 'endoff' can be halved
isOccluded(spn, cpn,
step, stepfac, startoff, endoff / 2.0f, needed_count) &&
isOccluded(spn, cpn + v3s16(bs2,bs2,bs2),
step, stepfac, startoff, endoff, needed_count) &&
isOccluded(spn, cpn + v3s16(bs2,bs2,-bs2),
step, stepfac, startoff, endoff, needed_count) &&
isOccluded(spn, cpn + v3s16(bs2,-bs2,bs2),
step, stepfac, startoff, endoff, needed_count) &&
isOccluded(spn, cpn + v3s16(bs2,-bs2,-bs2),
step, stepfac, startoff, endoff, needed_count) &&
isOccluded(spn, cpn + v3s16(-bs2,bs2,bs2),
step, stepfac, startoff, endoff, needed_count) &&
isOccluded(spn, cpn + v3s16(-bs2,bs2,-bs2),
step, stepfac, startoff, endoff, needed_count) &&
isOccluded(spn, cpn + v3s16(-bs2,-bs2,bs2),
step, stepfac, startoff, endoff, needed_count) &&
isOccluded(spn, cpn + v3s16(-bs2,-bs2,-bs2),
step, stepfac, startoff, endoff, needed_count));
}
/*
ServerMap
*/