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- split long rays into shorter rays to speed up collision detection

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This commit is contained in:
Magnus Norddahl 2018-10-30 13:25:37 +01:00
parent 0e17412b23
commit f0ec4a6838
1 changed files with 19 additions and 1 deletions
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20
src/lightmap/collision.cpp
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@ -74,7 +74,25 @@ bool TriangleMeshShape::find_any_hit(TriangleMeshShape *shape, const kexVec3 &ra
TraceHit TriangleMeshShape::find_first_hit(TriangleMeshShape *shape, const kexVec3 &ray_start, const kexVec3 &ray_end) TraceHit TriangleMeshShape::find_first_hit(TriangleMeshShape *shape, const kexVec3 &ray_start, const kexVec3 &ray_end)
{ {
TraceHit hit; TraceHit hit;
find_first_hit(shape, ray_start, ray_end, shape->root, &hit);
// Perform segmented tracing to keep the ray AABB box smaller
kexVec3 ray_dir = ray_end - ray_start;
float tracedist = ray_dir.Length();
float segmentlen = std::max(100.0f, tracedist / 20.0f);
for (float t = 0.0f; t < tracedist; t += segmentlen)
{
float segstart = t / tracedist;
float segend = std::min(t + segmentlen, tracedist) / tracedist;
find_first_hit(shape, ray_start + ray_dir * segstart, ray_start + ray_dir * segend, shape->root, &hit);
if (hit.fraction < 1.0f)
{
hit.fraction = segstart * (1.0f - hit.fraction) + segend * hit.fraction;
break;
}
}
if (hit.surface != -1) if (hit.surface != -1)
hit.surface = shape->surfaces[hit.surface / 3]; hit.surface = shape->surfaces[hit.surface / 3];
return hit; return hit;