mirror of
https://github.com/Relintai/pandemonium_engine_minimal.git
synced 2024-12-21 16:56:50 +01:00
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
#ifndef BT_CONVEX_HULL_COMPUTER_H
|
|
#define BT_CONVEX_HULL_COMPUTER_H
|
|
/*
|
|
Copyright (c) 2011 Ole Kniemeyer, MAXON, www.maxon.net
|
|
|
|
This software is provided 'as-is', without any express or implied warranty.
|
|
In no event will the authors be held liable for any damages arising from the use of this software.
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it freely,
|
|
subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include "btAlignedObjectArray.h"
|
|
#include "btVector3.h"
|
|
|
|
// -- PANDEMONIUM start --
|
|
namespace VHACD {
|
|
// -- PANDEMONIUM end --
|
|
|
|
/// Convex hull implementation based on Preparata and Hong
|
|
/// See http://code.google.com/p/bullet/issues/detail?id=275
|
|
/// Ole Kniemeyer, MAXON Computer GmbH
|
|
class btConvexHullComputer {
|
|
private:
|
|
btScalar compute(const void* coords, bool doubleCoords, int32_t stride, int32_t count, btScalar shrink, btScalar shrinkClamp);
|
|
|
|
public:
|
|
class Edge {
|
|
private:
|
|
int32_t next;
|
|
int32_t reverse;
|
|
int32_t targetVertex;
|
|
|
|
friend class btConvexHullComputer;
|
|
|
|
public:
|
|
int32_t getSourceVertex() const
|
|
{
|
|
return (this + reverse)->targetVertex;
|
|
}
|
|
|
|
int32_t getTargetVertex() const
|
|
{
|
|
return targetVertex;
|
|
}
|
|
|
|
const Edge* getNextEdgeOfVertex() const // clockwise list of all edges of a vertex
|
|
{
|
|
return this + next;
|
|
}
|
|
|
|
const Edge* getNextEdgeOfFace() const // counter-clockwise list of all edges of a face
|
|
{
|
|
return (this + reverse)->getNextEdgeOfVertex();
|
|
}
|
|
|
|
const Edge* getReverseEdge() const
|
|
{
|
|
return this + reverse;
|
|
}
|
|
};
|
|
|
|
// Vertices of the output hull
|
|
btAlignedObjectArray<btVector3> vertices;
|
|
|
|
// Edges of the output hull
|
|
btAlignedObjectArray<Edge> edges;
|
|
|
|
// Faces of the convex hull. Each entry is an index into the "edges" array pointing to an edge of the face. Faces are planar n-gons
|
|
btAlignedObjectArray<int32_t> faces;
|
|
|
|
/*
|
|
Compute convex hull of "count" vertices stored in "coords". "stride" is the difference in bytes
|
|
between the addresses of consecutive vertices. If "shrink" is positive, the convex hull is shrunken
|
|
by that amount (each face is moved by "shrink" length units towards the center along its normal).
|
|
If "shrinkClamp" is positive, "shrink" is clamped to not exceed "shrinkClamp * innerRadius", where "innerRadius"
|
|
is the minimum distance of a face to the center of the convex hull.
|
|
|
|
The returned value is the amount by which the hull has been shrunken. If it is negative, the amount was so large
|
|
that the resulting convex hull is empty.
|
|
|
|
The output convex hull can be found in the member variables "vertices", "edges", "faces".
|
|
*/
|
|
btScalar compute(const float* coords, int32_t stride, int32_t count, btScalar shrink, btScalar shrinkClamp)
|
|
{
|
|
return compute(coords, false, stride, count, shrink, shrinkClamp);
|
|
}
|
|
|
|
// same as above, but double precision
|
|
btScalar compute(const double* coords, int32_t stride, int32_t count, btScalar shrink, btScalar shrinkClamp)
|
|
{
|
|
return compute(coords, true, stride, count, shrink, shrinkClamp);
|
|
}
|
|
};
|
|
|
|
// -- PANDEMONIUM start --
|
|
}; // namespace VHACD
|
|
// -- PANDEMONIUM end --
|
|
|
|
#endif //BT_CONVEX_HULL_COMPUTER_H
|