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/**
* @file llphysicsshapebuilder.h
* @brief Generic system to convert LL(Physics)VolumeParams to physics shapes
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_PHYSICS_SHAPE_BUILDER_H
#define LL_PHYSICS_SHAPE_BUILDER_H
#include "indra_constants.h"
#include "llvolume.h"
#define USE_SHAPE_QUANTIZATION 0
#define SHAPE_BUILDER_DEFAULT_VOLUME_DETAIL 1
#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_HOLLOW 0.10f
#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_HOLLOW_SPHERES 0.90f
#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_PATH_CUT 0.05f
#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_TAPER 0.05f
#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_TWIST 0.09f
#define SHAPE_BUILDER_IMPLICIT_THRESHOLD_SHEAR 0.05f
const F32 COLLISION_TOLERANCE = 0.1f;
const F32 SHAPE_BUILDER_ENTRY_SNAP_SCALE_BIN_SIZE = 0.15f;
const F32 SHAPE_BUILDER_ENTRY_SNAP_PARAMETER_BIN_SIZE = 0.010f;
const F32 SHAPE_BUILDER_CONVEXIFICATION_SIZE = 2.f * COLLISION_TOLERANCE;
const F32 SHAPE_BUILDER_MIN_GEOMETRY_SIZE = 0.5f * COLLISION_TOLERANCE;
const F32 SHAPE_BUILDER_USER_MESH_CONVEXIFICATION_SIZE = 0.5f;
class LLPhysicsVolumeParams : public LLVolumeParams
{
public:
LLPhysicsVolumeParams( const LLVolumeParams& params, bool forceConvex ) :
LLVolumeParams( params ),
mForceConvex(forceConvex) {}
bool operator==(const LLPhysicsVolumeParams ¶ms) const
{
return ( LLVolumeParams::operator==(params) && (mForceConvex == params.mForceConvex) );
}
bool operator!=(const LLPhysicsVolumeParams ¶ms) const
{
return !operator==(params);
}
bool operator<(const LLPhysicsVolumeParams ¶ms) const
{
if ( LLVolumeParams::operator!=(params) )
{
return LLVolumeParams::operator<(params);
}
return (params.mForceConvex == false) && (mForceConvex == true);
}
bool shouldForceConvex() const { return mForceConvex; }
bool hasDecomposition() const;
private:
bool mForceConvex;
};
class LLPhysicsShapeBuilderUtil
{
public:
class PhysicsShapeSpecification
{
public:
enum ShapeType
{
// Primitive types
BOX,
SPHERE,
CYLINDER,
USER_CONVEX, // User specified they wanted the convex hull of the volume
PRIM_CONVEX, // Either a volume that is inherently convex but not a primitive type, or a shape
// with dimensions such that will convexify it anyway.
SCULPT, // Special case for traditional sculpts--they are the convex hull of a single particular set of volume params
USER_MESH, // A user mesh. May or may not contain a convex decomposition.
PRIM_MESH, // A non-convex volume which we have to represent accurately
INVALID
};
PhysicsShapeSpecification() :
mType( INVALID ),
mScale( 0.f, 0.f, 0.f ),
mCenter( 0.f, 0.f, 0.f ) {}
bool isConvex() { return (mType != USER_MESH && mType != PRIM_MESH && mType != INVALID); }
bool isMesh() { return (mType == USER_MESH) || (mType == PRIM_MESH); }
ShapeType getType() { return mType; }
const LLVector3& getScale() { return mScale; }
const LLVector3& getCenter() { return mCenter; }
private:
friend class LLPhysicsShapeBuilderUtil;
ShapeType mType;
// Dimensions of an AABB around the shape
LLVector3 mScale;
// Offset of shape from origin of primitive's reference frame
LLVector3 mCenter;
};
static void determinePhysicsShape( const LLPhysicsVolumeParams& volume_params, const LLVector3& scale, PhysicsShapeSpecification& specOut );
};
#endif //LL_PHYSICS_SHAPE_BUILDER_H
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