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set hull from vertex format

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The user can create a convex hull from a vertex format, not directly from a list of vertices. That's interesting because in some 3D engines convex hulls are typically created from a render mesh that might structure a vertex in different ways in the memory.
This commit is contained in:
Irlan
2018-09-04 17:52:17 -03:00
parent 4bef8b11d2
commit 6486770fc1
5 changed files with 34 additions and 27 deletions
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43
src/bounce/collision/shapes/qhull.cpp
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@@ -98,22 +98,27 @@ static b3Vec3 b3ComputeCentroid(b3QHull* hull)
return centroid;
}
void b3QHull::Set(const b3Vec3* points, u32 count, bool simplify)
void b3QHull::Set(u32 vtxStride, const void* vtxBase, u32 vtxCount, bool simplify)
{
B3_ASSERT(count >= 4);
B3_ASSERT(vtxStride >= sizeof(b3Vec3));
B3_ASSERT(vtxCount >= 4);
// Copy points into local buffer, perform welding.
u32 psCount = 0;
b3Vec3* ps = (b3Vec3*)b3Alloc(count * sizeof(b3Vec3));
for (u32 i = 0; i < count; ++i)
// Copy vertices into local buffer, perform welding.
u32 vs0Count = 0;
b3Vec3* vs0 = (b3Vec3*)b3Alloc(vtxCount * sizeof(b3Vec3));
for (u32 i = 0; i < vtxCount; ++i)
{
b3Vec3 p = points[i];
b3Vec3 v = *(b3Vec3*)((u8*)vtxBase + vtxStride * i);
B3_ASSERT(b3IsValid(v.x));
B3_ASSERT(b3IsValid(v.y));
B3_ASSERT(b3IsValid(v.z));
bool unique = true;
for (u32 j = 0; j < psCount; ++j)
for (u32 j = 0; j < vs0Count; ++j)
{
if (b3DistanceSquared(p, ps[j]) <= B3_LINEAR_SLOP * B3_LINEAR_SLOP)
if (b3DistanceSquared(v, vs0[j]) <= B3_LINEAR_SLOP * B3_LINEAR_SLOP)
{
unique = false;
break;
@@ -122,14 +127,14 @@ void b3QHull::Set(const b3Vec3* points, u32 count, bool simplify)
if (unique)
{
ps[psCount++] = p;
vs0[vs0Count++] = v;
}
}
if (psCount < 4)
if (vs0Count < 4)
{
// Polyhedron is degenerate.
b3Free(ps);
b3Free(vs0);
return;
}
@@ -139,8 +144,8 @@ void b3QHull::Set(const b3Vec3* points, u32 count, bool simplify)
if (simplify == true)
{
qhHull primary;
primary.Construct(ps, psCount);
b3Free(ps);
primary.Construct(vs0, vs0Count);
b3Free(vs0);
// Simplify the constructed hull.
@@ -251,8 +256,8 @@ void b3QHull::Set(const b3Vec3* points, u32 count, bool simplify)
}
else
{
hull.Construct(ps, psCount);
b3Free(ps);
hull.Construct(vs0, vs0Count);
b3Free(vs0);
}
// Convert the constructed hull into a run-time hull.
@@ -371,7 +376,7 @@ void b3QHull::SetAsSphere(float32 radius)
}
// Set
Set(vs, e_vertexCount, false);
Set(sizeof(b3Vec3), vs, e_vertexCount, false);
}
void b3QHull::SetAsCylinder(float32 radius, float32 ey)
@@ -423,7 +428,7 @@ void b3QHull::SetAsCylinder(float32 radius, float32 ey)
}
// Set
Set(vs, count, false);
Set(sizeof(b3Vec3), vs, count, false);
}
void b3QHull::SetAsCone(float32 radius, float32 ey)
@@ -458,5 +463,5 @@ void b3QHull::SetAsCone(float32 radius, float32 ey)
vs[count++].Set(0.0f, ey, 0.0f);
// Set
Set(vs, count, false);
Set(sizeof(b3Vec3), vs, count, false);
}