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support for ShapeInfo::offset

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This commit is contained in:
Andrew Meadows 2015-05-21 16:25:05 -07:00
parent f6721aa6eb
commit 466af03fa9
3 changed files with 29 additions and 6 deletions
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17
libraries/physics/src/ShapeFactory.cpp
View file

@ -9,6 +9,8 @@
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
#include <glm/gtx/norm.hpp>
#include <SharedUtil.h> // for MILLIMETERS_PER_METER
#include "ShapeFactory.h"
@ -59,7 +61,8 @@ btConvexHullShape* ShapeFactory::createConvexHull(const QVector<glm::vec3>& poin
btCollisionShape* ShapeFactory::createShapeFromInfo(const ShapeInfo& info) {
btCollisionShape* shape = NULL;
switch(info.getType()) {
int type = info.getType();
switch(type) {
case SHAPE_TYPE_BOX: {
shape = new btBoxShape(glmToBullet(info.getHalfExtents()));
}
@ -95,5 +98,17 @@ btCollisionShape* ShapeFactory::createShapeFromInfo(const ShapeInfo& info) {
}
break;
}
if (shape && type != SHAPE_TYPE_COMPOUND) {
if (glm::length2(info.getOffset()) > MIN_SHAPE_OFFSET * MIN_SHAPE_OFFSET) {
// this shape has an offset, which we support by wrapping the true shape
// in a btCompoundShape with a local transform
auto compound = new btCompoundShape();
btTransform trans;
trans.setIdentity();
trans.setOrigin(glmToBullet(info.getOffset()));
compound->addChildShape(trans, shape);
shape = compound;
}
}
return shape;
}

15
libraries/shared/src/ShapeInfo.cpp
View file

@ -181,6 +181,7 @@ bool ShapeInfo::contains(const glm::vec3& point) const {
const DoubleHashKey& ShapeInfo::getHash() const {
// NOTE: we cache the key so we only ever need to compute it once for any valid ShapeInfo instance.
if (_doubleHashKey.isNull() && _type != SHAPE_TYPE_NONE) {
bool useOffset = glm::length2(_offset) > MIN_SHAPE_OFFSET * MIN_SHAPE_OFFSET;
// The key is not yet cached therefore we must compute it! To this end we bypass the const-ness
// of this method by grabbing a non-const pointer to "this" and a non-const reference to _doubleHashKey.
ShapeInfo* thisPtr = const_cast<ShapeInfo*>(this);
@ -199,9 +200,11 @@ const DoubleHashKey& ShapeInfo::getHash() const {
hash ^= DoubleHashKey::hashFunction(
(uint32_t)(_halfExtents[j] * MILLIMETERS_PER_METER + copysignf(1.0f, _halfExtents[j]) * 0.49f),
primeIndex++);
hash ^= DoubleHashKey::hashFunction(
(uint32_t)(_offset[j] * MILLIMETERS_PER_METER + copysignf(1.0f, _offset[j]) * 0.49f),
primeIndex++);
if (useOffset) {
hash ^= DoubleHashKey::hashFunction(
(uint32_t)(_offset[j] * MILLIMETERS_PER_METER + copysignf(1.0f, _offset[j]) * 0.49f),
primeIndex++);
}
}
key.setHash(hash);
@ -212,8 +215,10 @@ const DoubleHashKey& ShapeInfo::getHash() const {
// so the cast to int produces a round() effect rather than a floor()
uint32_t floatHash = DoubleHashKey::hashFunction2(
(uint32_t)(_halfExtents[j] * MILLIMETERS_PER_METER + copysignf(1.0f, _halfExtents[j]) * 0.49f));
floatHash ^= DoubleHashKey::hashFunction2(
(uint32_t)(_offset[j] * MILLIMETERS_PER_METER + copysignf(1.0f, _offset[j]) * 0.49f));
if (useOffset) {
floatHash ^= DoubleHashKey::hashFunction2(
(uint32_t)(_offset[j] * MILLIMETERS_PER_METER + copysignf(1.0f, _offset[j]) * 0.49f));
}
hash += ~(floatHash << 17);
hash ^= (floatHash >> 11);
hash += (floatHash << 4);

3
libraries/shared/src/ShapeInfo.h
View file

@ -16,9 +16,12 @@
#include <QString>
#include <QUrl>
#include <glm/glm.hpp>
#include <glm/gtx/norm.hpp>
#include "DoubleHashKey.h"
const float MIN_SHAPE_OFFSET = 0.001f; // offsets less than 1mm will be ignored
enum ShapeType {
SHAPE_TYPE_NONE,
SHAPE_TYPE_BOX,