下列的这个答案 https://stackoverflow.com/a/54901850/3405291,我正在进行连续的光线投射:
m_rayCaster = new Qt3DRender::QRayCaster(m_scene->rootEntity());
m_rayCaster->setRunMode(Qt3DRender::QAbstractRayCaster::SingleShot);
m_scene->rootEntity()->addComponent(m_rayCaster);
我有这些插槽要处理whether and when应进行下一次连续光线投射测试:
QObject::connect(m_rayCaster, &Qt3DRender::QRayCaster::hitsChanged, this, &RayCastHandler::handleRayCasterHits);
QObject::connect(m_rayCaster, &Qt3DCore::QNode::enabledChanged, this, &RayCastHandler::handleRayCasterEnabledChange);
QObject::connect(this, &RayCastHandler::isPreviousTestDoneChanged, this, &RayCastHandler::handleIsPreviousTestDoneChange);
QObject::connect(this, &RayCastHandler::isNextTestRequiredChanged, this, &RayCastHandler::handleIsNextTestRequiredChange);
插槽设置条件并检查它们:
void RayCastHandler::handleRayCasterHits(const Qt3DRender::QAbstractRayCaster::Hits hits)
{
analyzeHits(hits);
bool required = isNextTestRequired(/* according to m_testCounter, m_testsTotal, ... */);
emit isNextTestRequiredChanged(required);
emit isPreviousTestDoneChanged(true);
return;
}
void RayCastHandler::handleRayCasterEnabledChange(const bool enabled)
{
m_isRayCasterEnabled = enabled;
triggerNextTestIfAllConditionsAreTrue();
return;
}
void RayCastHandler::handleIsPreviousTestDoneChange(const bool done)
{
m_isPreviousTestDone = done;
triggerNextTestIfAllConditionsAreTrue();
return;
}
void RayCastHandler::handleIsNextTestRequiredChange(const bool required)
{
m_isNextTestRequired = required;
if (!m_isNextTestRequired)
emit rayCastResultsChanged(m_collisions);
triggerNextTestIfAllConditionsAreTrue();
return;
}
检查是否需要下一次光线投射测试的代码:
bool RayCastHandler::isNextTestRequired(int &testCounter, const int &testsTotal)
{
testCounter++;
if (testCounter >= testsTotal) {
return false;
}
return true;
}
最后,检查触发下一次光线投射测试的所有条件的函数是:
bool RayCastHandler::triggerNextTestIfAllConditionsAreTrue()
{
if (m_isPreviousTestDone && m_isNextTestRequired && m_isRayCasterEnabled) {
triggerTest(/* Will trigger next ray cast test */);
m_isPreviousTestDone = false;
m_isNextTestRequired = false;
m_isRayCasterEnabled = false;
}
}
该代码工作正常,但在投射几条连续的光线后,它停止了。
通过登录到控制台,我观察到m_rayCaster
看起来是随机启用/禁用的。我的意思是,有时在完成光线投射测试后,它会自行禁用,有时会自行启用!我想知道是否有人可以介绍一下参考Qt3DRender::QRayCaster
启用/禁用逻辑。我稍微查看了它的源代码,我想知道源代码的哪一部分可以帮助我弄清楚。