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// Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
/*!
* \class Qt3DExtras::QConeGeometry
* \ingroup qt3d-extras-geometries
* \inheaderfile Qt3DExtras/QConeGeometry
* \inmodule Qt3DExtras
* \brief The QConeGeometry class allows creation of a cone in 3D space.
* \since 5.7
* \ingroup geometries
* \inherits Qt3DCore::QGeometry
*
* The QConeGeometry class is most commonly used internally by the QConeMesh
* but can also be used in custom Qt3DRender::QGeometryRenderer subclasses. The class
* allows for creation of both a cone and a truncated cone.
*/
#ifndef _USE_MATH_DEFINES
# define _USE_MATH_DEFINES // For MSVC
#endif
#include "qconegeometry.h"
#include "qconegeometry_p.h"
#include <Qt3DCore/qattribute.h>
#include <Qt3DCore/qbuffer.h>
#include <QtGui/QVector3D>
#include <cmath>
QT_BEGIN_NAMESPACE
namespace Qt3DExtras {
using namespace Qt3DCore;
namespace {
int faceCount(int slices, int rings, int capCount)
{
return (slices * 2) * (rings - 1) + slices * capCount;
}
int vertexCount(int slices, int rings, int capCount)
{
return (slices + 1) * rings + capCount * (slices + 2);
}
void createSidesVertices(float *&verticesPtr,
int rings,
int slices,
double topRadius,
double bottomRadius,
double length)
{
const float dY = length / static_cast<float>(rings - 1);
const float dTheta = (M_PI * 2) / static_cast<float>(slices);
for (int ring = 0; ring < rings; ++ring) {
const float y = -length / 2.0f + static_cast<float>(ring) * dY;
const float t = (y + length / 2) / length;
const float radius = (bottomRadius * (1 - t)) + (t * topRadius);
for (int slice = 0; slice <= slices; ++slice) {
const float theta = static_cast<float>(slice) * dTheta;
const float ta = std::tan((M_PI/2) - std::atan(length / (bottomRadius - topRadius)));
const float ct = std::cos(theta);
const float st = std::sin(theta);
*verticesPtr++ = radius * ct;
*verticesPtr++ = y;
*verticesPtr++ = radius * st;
*verticesPtr++ = (y + length / 2.0) / length;
*verticesPtr++ = theta / (M_PI * 2);
QVector3D n(ct, ta, st);
n.normalize();
*verticesPtr++ = n.x();
*verticesPtr++ = n.y();
*verticesPtr++ = n.z();
}
}
}
void createSidesIndices(quint16 *&indicesPtr, int rings, int slices)
{
for (int ring = 0; ring < rings-1; ++ring) {
const int ringIndexStart = ring * (slices + 1);
const int nextRingIndexStart = (ring + 1) * (slices + 1);
for (int slice = 0; slice <= slices; ++slice) {
if (slice == slices)
continue;
const int nextSlice = slice + 1;
*indicesPtr++ = (ringIndexStart + slice);
*indicesPtr++ = (nextRingIndexStart + slice);
*indicesPtr++ = (ringIndexStart + nextSlice);
*indicesPtr++ = (ringIndexStart + nextSlice);
*indicesPtr++ = (nextRingIndexStart + slice);
*indicesPtr++ = (nextRingIndexStart + nextSlice);
}
}
}
void createDiscVertices(float *&verticesPtr,
int slices,
double topRadius,
double bottomRadius,
double length,
double yPosition)
{
const float dTheta = (M_PI * 2) / static_cast<float>(slices);
const double yNormal = (yPosition < 0.0f) ? -1.0f : 1.0f;
*verticesPtr++ = 0.0f;
*verticesPtr++ = yPosition;
*verticesPtr++ = 0.0f;
*verticesPtr++ = 1.0f;
*verticesPtr++ = 0.0f;
*verticesPtr++ = 0.0f;
*verticesPtr++ = yNormal;
*verticesPtr++ = 0.0f;
for (int slice = 0; slice <= slices; ++slice)
{
const float theta = static_cast<float>(slice) * dTheta;
const float ct = std::cos(theta);
const float st = std::sin(theta);
const float t = (yPosition + length / 2) / length;
const float radius = (bottomRadius * (1 - t)) + (t * topRadius);
*verticesPtr++ = radius * ct;
*verticesPtr++ = yPosition;
*verticesPtr++ = radius * st;
*verticesPtr++ = 1.0f;
*verticesPtr++ = theta / (M_PI * 2);
*verticesPtr++ = 0.0f;
*verticesPtr++ = yNormal;
*verticesPtr++ = 0.0f;
}
}
void createDiscIndices(quint16 *&indicesPtr,
int discCenterIndex,
int slices,
bool isTopCap)
{
if ( !isTopCap ) {
for ( int i = slices - 1 ; i >= 0 ; --i )
{
if ( i != 0 ) {
*indicesPtr++ = discCenterIndex;
*indicesPtr++ = discCenterIndex + i + 1;
*indicesPtr++ = discCenterIndex + i;
} else {
*indicesPtr++ = discCenterIndex;
*indicesPtr++ = discCenterIndex + i + 1;
*indicesPtr++ = discCenterIndex + slices;
}
}
} else {
for ( int i = 0 ; i < slices; ++i )
{
if ( i != slices - 1 ) {
*indicesPtr++ = discCenterIndex;
*indicesPtr++ = discCenterIndex + i + 1;
*indicesPtr++ = discCenterIndex + i + 2;
} else {
*indicesPtr++ = discCenterIndex;
*indicesPtr++ = discCenterIndex + i + 1;
*indicesPtr++ = discCenterIndex + 1;
}
}
}
}
} // anonymous
QConeGeometryPrivate::QConeGeometryPrivate()
: QGeometryPrivate()
, m_hasTopEndcap(true)
, m_hasBottomEndcap(true)
, m_rings(16)
, m_slices(16)
, m_topRadius(0.0f)
, m_bottomRadius(1.0f)
, m_length(1.0f)
, m_positionAttribute(nullptr)
, m_normalAttribute(nullptr)
, m_texCoordAttribute(nullptr)
, m_indexAttribute(nullptr)
, m_positionBuffer(nullptr)
, m_vertexBuffer(nullptr)
, m_indexBuffer(nullptr)
{
}
void QConeGeometryPrivate::init()
{
Q_Q(QConeGeometry);
m_positionAttribute = new QAttribute(q);
m_normalAttribute = new QAttribute(q);
m_texCoordAttribute = new QAttribute(q);
m_indexAttribute = new QAttribute(q);
m_vertexBuffer = new Qt3DCore::QBuffer(q);
m_indexBuffer = new Qt3DCore::QBuffer(q);
// vec3 pos, vec2 tex, vec3 normal
const quint32 elementSize = 3 + 2 + 3;
const quint32 stride = elementSize * sizeof(float);
const int faces = faceCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
const int nVerts = vertexCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
m_positionAttribute->setName(QAttribute::defaultPositionAttributeName());
m_positionAttribute->setVertexBaseType(QAttribute::Float);
m_positionAttribute->setVertexSize(3);
m_positionAttribute->setAttributeType(QAttribute::VertexAttribute);
m_positionAttribute->setBuffer(m_vertexBuffer);
m_positionAttribute->setByteStride(stride);
m_positionAttribute->setCount(nVerts);
m_texCoordAttribute->setName(QAttribute::defaultTextureCoordinateAttributeName());
m_texCoordAttribute->setVertexBaseType(QAttribute::Float);
m_texCoordAttribute->setVertexSize(2);
m_texCoordAttribute->setAttributeType(QAttribute::VertexAttribute);
m_texCoordAttribute->setBuffer(m_vertexBuffer);
m_texCoordAttribute->setByteStride(stride);
m_texCoordAttribute->setByteOffset(3 * sizeof(float));
m_texCoordAttribute->setCount(nVerts);
m_normalAttribute->setName(QAttribute::defaultNormalAttributeName());
m_normalAttribute->setVertexBaseType(QAttribute::Float);
m_normalAttribute->setVertexSize(3);
m_normalAttribute->setAttributeType(QAttribute::VertexAttribute);
m_normalAttribute->setBuffer(m_vertexBuffer);
m_normalAttribute->setByteStride(stride);
m_normalAttribute->setByteOffset(5 * sizeof(float));
m_normalAttribute->setCount(nVerts);
m_indexAttribute->setAttributeType(QAttribute::IndexAttribute);
m_indexAttribute->setVertexBaseType(QAttribute::UnsignedShort);
m_indexAttribute->setBuffer(m_indexBuffer);
m_indexAttribute->setCount(faces * 3);
m_vertexBuffer->setData(generateVertexData());
m_indexBuffer->setData(generateIndexData());
q->addAttribute(m_positionAttribute);
q->addAttribute(m_texCoordAttribute);
q->addAttribute(m_normalAttribute);
q->addAttribute(m_indexAttribute);
}
QByteArray QConeGeometryPrivate::generateVertexData() const
{
const int verticesCount =
vertexCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
// vec3 pos, vec2 texCoord, vec3 normal
const quint32 vertexSize = (3 + 2 + 3) * sizeof(float);
QByteArray verticesData;
verticesData.resize(vertexSize * verticesCount);
float *verticesPtr = reinterpret_cast<float*>(verticesData.data());
createSidesVertices(verticesPtr, m_rings, m_slices, m_topRadius, m_bottomRadius, m_length);
if ( m_hasTopEndcap )
createDiscVertices(verticesPtr, m_slices, m_topRadius, m_bottomRadius, m_length, m_length * 0.5f);
if ( m_hasBottomEndcap )
createDiscVertices(verticesPtr, m_slices, m_topRadius, m_bottomRadius, m_length, -m_length * 0.5f);
return verticesData;
}
QByteArray QConeGeometryPrivate::generateIndexData() const
{
const int facesCount = faceCount(m_slices, m_rings, (m_hasTopEndcap + m_hasBottomEndcap));
const int indicesCount = facesCount * 3;
const int indexSize = sizeof(quint16);
Q_ASSERT(indicesCount < 65536);
QByteArray indicesBytes;
indicesBytes.resize(indicesCount * indexSize);
quint16 *indicesPtr = reinterpret_cast<quint16*>(indicesBytes.data());
createSidesIndices(indicesPtr, m_rings, m_slices);
if ( m_hasTopEndcap )
createDiscIndices(indicesPtr, m_rings * (m_slices + 1) + m_slices + 2, m_slices, true);
if ( m_hasBottomEndcap )
createDiscIndices(indicesPtr, m_rings * (m_slices + 1), m_slices, false);
return indicesBytes;
}
/*!
* \qmltype ConeGeometry
* \nativetype Qt3DExtras::QConeGeometry
* \inqmlmodule Qt3D.Extras
* \brief ConeGeometry allows creation of a cone in 3D space.
*
* The ConeGeometry type is most commonly used internally by the ConeMesh type
* but can also be used in custom GeometryRenderer types.
* The ConeGeometry type allows for creation of both a cone and a truncated cone.
*/
/*!
* \qmlproperty bool ConeGeometry::hasTopEndcap
*
* Determines if the cone top is capped or open.
*/
/*!
* \qmlproperty bool ConeGeometry::hasBottomEndcap
*
* Determines if the cone bottom is capped or open.
*/
/*!
* \qmlproperty int ConeGeometry::rings
*
* Holds the number of rings in the geometry.
*/
/*!
* \qmlproperty int ConeGeometry::slices
*
* Holds the number of slices in the geometry.
*/
/*!
* \qmlproperty real ConeGeometry::topRadius
*
* Holds the top radius of the cone.
*/
/*!
* \qmlproperty real ConeGeometry::bottomRadius
*
* Holds the bottom radius of the cone.
*/
/*!
* \qmlproperty real ConeGeometry::length
*
* Holds the length of the cone.
*/
/*!
* \qmlproperty Attribute ConeGeometry::positionAttribute
*
* Holds the geometry position attribute.
*/
/*!
* \qmlproperty Attribute ConeGeometry::normalAttribute
*
* Holds the geometry normal attribute.
*/
/*!
* \qmlproperty Attribute ConeGeometry::texCoordAttribute
*
* Holds the geometry texture coordinate attribute.
*/
/*!
* \qmlproperty Attribute ConeGeometry::indexAttribute
*
* Holds the geometry index attribute.
*/
QConeGeometry::QConeGeometry(QNode *parent)
: QGeometry(*new QConeGeometryPrivate, parent)
{
Q_D(QConeGeometry);
d->init();
}
QConeGeometry::QConeGeometry(QConeGeometryPrivate &dd, QNode *parent)
:QGeometry(dd, parent)
{
Q_D(QConeGeometry);
d->init();
}
/*! \internal */
QConeGeometry::~QConeGeometry()
{
}
/*!
* Updates vertices based on geometry properties.
*/
void QConeGeometry::updateVertices()
{
Q_D(QConeGeometry);
const int nVerts = vertexCount(d->m_slices, d->m_rings,
(d->m_hasTopEndcap + d->m_hasBottomEndcap));
d->m_positionAttribute->setCount(nVerts);
d->m_texCoordAttribute->setCount(nVerts);
d->m_normalAttribute->setCount(nVerts);
d->m_vertexBuffer->setData(d->generateVertexData());
}
/*!
* Updates indices based on geometry properties.
*/
void QConeGeometry::updateIndices()
{
Q_D(QConeGeometry);
const int faces = faceCount(d->m_slices, d->m_rings,
(d->m_hasTopEndcap + d->m_hasBottomEndcap));
d->m_indexAttribute->setCount(faces * 3);
d->m_indexBuffer->setData(d->generateIndexData());
}
/*!
* \property Qt3DExtras::QConeGeometry::hasTopEndcap
*
* Determines if the cone top is capped or open.
*/
/*!
* \property Qt3DExtras::QConeGeometry::hasBottomEndcap
*
* Determines if the cone bottom is capped or open.
*/
/*!
* \property Qt3DExtras::QConeGeometry::rings
*
* Holds the number of rings in the geometry.
*/
/*!
* \property Qt3DExtras::QConeGeometry::slices
*
* Holds the number of slices in the geometry.
*/
/*!
* \property Qt3DExtras::QConeGeometry::topRadius
*
* Holds the top radius of the cone.
*/
/*!
* \property Qt3DExtras::QConeGeometry::bottomRadius
*
* Holds the bottom radius of the cone.
*/
/*!
* \property Qt3DExtras::QConeGeometry::length
*
* Holds the length of the cone.
*/
/*!
* \property Qt3DExtras::QConeGeometry::positionAttribute
*
* Holds the geometry position attribute.
*/
/*!
* \property Qt3DExtras::QConeGeometry::normalAttribute
*
* Holds the geometry normal attribute.
*/
/*!
* \property Qt3DExtras::QConeGeometry::texCoordAttribute
*
* Holds the geometry texture coordinate attribute.
*/
/*!
* \property Qt3DExtras::QConeGeometry::indexAttribute
*
* Holds the geometry index attribute.
*/
void QConeGeometry::setHasTopEndcap(bool hasTopEndcap)
{
Q_D(QConeGeometry);
if (hasTopEndcap != d->m_hasTopEndcap) {
d->m_hasTopEndcap = hasTopEndcap;
updateVertices();
emit hasTopEndcapChanged(hasTopEndcap);
}
}
void QConeGeometry::setHasBottomEndcap(bool hasBottomEndcap)
{
Q_D(QConeGeometry);
if (hasBottomEndcap != d->m_hasBottomEndcap) {
d->m_hasBottomEndcap = hasBottomEndcap;
updateVertices();
emit hasBottomEndcapChanged(hasBottomEndcap);
}
}
void QConeGeometry::setRings(int rings)
{
Q_D(QConeGeometry);
if (rings != d->m_rings) {
d->m_rings = rings;
updateVertices();
updateIndices();
emit ringsChanged(rings);
}
}
void QConeGeometry::setSlices(int slices)
{
Q_D(QConeGeometry);
if (slices != d->m_slices) {
d->m_slices = slices;
updateVertices();
updateIndices();
emit slicesChanged(slices);
}
}
void QConeGeometry::setTopRadius(float topRadius)
{
Q_D(QConeGeometry);
if (topRadius != d->m_topRadius) {
d->m_topRadius = topRadius;
updateVertices();
emit topRadiusChanged(topRadius);
}
}
void QConeGeometry::setBottomRadius(float bottomRadius)
{
Q_D(QConeGeometry);
if (bottomRadius != d->m_bottomRadius) {
d->m_bottomRadius = bottomRadius;
updateVertices();
emit bottomRadiusChanged(bottomRadius);
}
}
void QConeGeometry::setLength(float length)
{
Q_D(QConeGeometry);
if (length != d->m_length) {
d->m_length = length;
updateVertices();
updateIndices();
emit lengthChanged(length);
}
}
bool QConeGeometry::hasTopEndcap() const
{
Q_D(const QConeGeometry);
return d->m_hasTopEndcap;
}
bool QConeGeometry::hasBottomEndcap() const
{
Q_D(const QConeGeometry);
return d->m_hasBottomEndcap;
}
float QConeGeometry::topRadius() const
{
Q_D(const QConeGeometry);
return d->m_topRadius;
}
float QConeGeometry::bottomRadius() const
{
Q_D(const QConeGeometry);
return d->m_bottomRadius;
}
int QConeGeometry::rings() const
{
Q_D(const QConeGeometry);
return d->m_rings;
}
int QConeGeometry::slices() const
{
Q_D(const QConeGeometry);
return d->m_slices;
}
float QConeGeometry::length() const
{
Q_D(const QConeGeometry);
return d->m_length;
}
QAttribute *QConeGeometry::positionAttribute() const
{
Q_D(const QConeGeometry);
return d->m_positionAttribute;
}
QAttribute *QConeGeometry::normalAttribute() const
{
Q_D(const QConeGeometry);
return d->m_normalAttribute;
}
QAttribute *QConeGeometry::texCoordAttribute() const
{
Q_D(const QConeGeometry);
return d->m_texCoordAttribute;
}
QAttribute *QConeGeometry::indexAttribute() const
{
Q_D(const QConeGeometry);
return d->m_indexAttribute;
}
} // namespace Qt3DExtras
QT_END_NAMESPACE
#include "moc_qconegeometry.cpp"