void HalfSpace3<Real>::Get (Vector3<Real>& rkNormal, Real& rfConstant) const
{
rkNormal.X() = m_afTuple[0];
rkNormal.Y() = m_afTuple[1];
rkNormal.Z() = m_afTuple[2];
rfConstant = m_afTuple[3];
}
void HalfSpace3<Real>::Set (const Vector3<Real>& rkNormal, Real fConstant)
{
m_afTuple[0] = rkNormal.X();
m_afTuple[1] = rkNormal.Y();
m_afTuple[2] = rkNormal.Z();
m_afTuple[3] = fConstant;
}
// http://forums.macrumors.com/showthread.php?t=547587
void CameraRenderNode::perspective(double fovy, double zNear, double zFar) {
Vector2 screenBounds = scene->getSettingsManager()->getPixelViewportBounds();
double aspect = (double)screenBounds.X()/screenBounds.Y();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
double xmin, xmax, ymin, ymax;
ymax = zNear * tan(fovy * M_PI / 360.0);
//ymax = zNear * tan(fovy);
ymin = -ymax;
xmin = ymin * aspect;
xmax = ymax * aspect;
glFrustumf(xmin, xmax, ymin, ymax, zNear, zFar);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glDepthMask(GL_TRUE);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
switch(scene->getSettingsManager()->getRotation()) {
case ROTATION_PORTRAIT:
break;
case ROTATION_LANDSCAPE_COUNTERCLOCKWISE:
glRotatef(-90.0f, 0.0f, 0.0f, 1.0f);
break;
case ROTATION_PORTRAIT_UPSIDEDOWN:
glRotatef(-180.0f, 0.0f, 0.0f, 1.0f);
break;
case ROTATION_LANDSCAPE_CLOCKWISE:
glRotatef(-270.0f, 0.0f, 0.0f, 1.0f);
break;
}
Quaternion* orientation = owner->getTransform()->getOrientation();
GLfloat angle;
Vector3 axis;
orientation->ToAxisAngle(axis, angle);
angle = angle/Wm5::Mathf::PI * 180.0f;
glRotatef(angle, axis.X(), axis.Y(), axis.Z());
Vector3* pos = owner->getTransform()->getPosition();
glTranslatef(-pos->X(), -pos->Y(), -pos->Z());
}
void ModelLoader::ReadVertexData(FILE* apFile)
{
Vector3 tmpVec;
fscanf(apFile, "%f %f %f",&tmpVec.X(),&tmpVec.Y(),&tmpVec.Z());
mVertices.push_back(tmpVec);
}
void ModelLoader::ReadNormalData(FILE* apFile)
{
Vector3 tmpVec;
fscanf(apFile, "%f %f %f",&tmpVec.X(),&tmpVec.Y(),&tmpVec.Z());
mNormals.push_back(tmpVec);
}
HalfSpace3<Real>::HalfSpace3 (const Vector3<Real>& rkNormal,
const Vector3<Real>& rkPoint)
{
m_afTuple[0] = rkNormal.X();
m_afTuple[1] = rkNormal.Y();
m_afTuple[2] = rkNormal.Z();
m_afTuple[3] = rkNormal.Dot(rkPoint);
}
void Shader::SetVector3(std::string name, Vector3 value)
{
int uloc = SIG_FindUniform(name);
if (uloc != -1) {
glUniform3fARB(uloc, value.X(), value.Y(), value.Z());
} else {
SIG_LOG("Could not find uniform \"" << name << "\"");
}
}
void RenderUtils::drawLine(const Vector3& from, const Vector3& to, const Vector3& color) {
glBindBuffer(GL_ARRAY_BUFFER, 0);
glEnableClientState(GL_VERTEX_ARRAY);
glDisable(GL_TEXTURE_2D);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
GLfloat points[6];
points[0] = from.X();
points[1] = from.Y();
points[2] = from.Z();
points[3] = to.X();
points[4] = to.Y();
points[5] = to.Z();
glColor4f (color.X(), color.Y(), color.Z(), 1.0f);
glVertexPointer(3, GL_FLOAT, 0, points);
glDrawArrays(GL_LINES, 0, 2);
}
Plane::Plane(const Vector3 &n, double d)
{
Vector3 norm = n;
norm.normalize();
a = norm.X();
b = norm.Y();
c = norm.Z();
this->d = d;
}
Vector3 Matrix4::operator*(const Vector3 &aRHS) const
{
if(mIdentity)
{
return aRHS;
}
else
{
Vector3 r;
float fInvW = 1.0f / ( mComponents[3][0] * aRHS.X() + mComponents[3][1] * aRHS.Y() + mComponents[3][2] * aRHS.Z() + mComponents[3][3] );
r.X() = ( mComponents[0][0] * aRHS.X() + mComponents[0][1] * aRHS.Y() + mComponents[0][2] * aRHS.Z() + mComponents[0][3] ) * fInvW;
r.Y() = ( mComponents[1][0] * aRHS.X() + mComponents[1][1] * aRHS.Y() + mComponents[1][2] * aRHS.Z() + mComponents[1][3] ) * fInvW;
r.Z() = ( mComponents[2][0] * aRHS.X() + mComponents[2][1] * aRHS.Y() + mComponents[2][2] * aRHS.Z() + mComponents[2][3] ) * fInvW;
return r;
}
}
void RenderUtils::drawPolygon(const std::vector<Vector3>& points, const Vector3& color, bool filled) {
glBindBuffer(GL_ARRAY_BUFFER, 0);
glEnableClientState(GL_VERTEX_ARRAY);
glDisable(GL_TEXTURE_2D);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
GLfloat vertices[3 * points.size()];
int count=0;
for (int i = 0; i < points.size(); i++)
{
Vector3 p = points[i];
vertices[count++] = p.X();
vertices[count++] = p.Y();
vertices[count++] = p.Z();
}
glColor4f (color.X(), color.Y(), color.Z(), 1.0f);
glVertexPointer (3, GL_FLOAT, 0, vertices);
glDrawArrays ((filled) ? GL_TRIANGLE_FAN : GL_LINE_LOOP, 0, points.size());
}
Vector3<Real> Torus3<Real>::Normal (Real fS, Real fT)
{
Real fTwoPiS = Math<Real>::TWO_PI*fS;
Real fCosTwoPiS = Math<Real>::Cos(fTwoPiS);
Real fSinTwoPiS = Math<Real>::Sin(fTwoPiS);
Vector3<Real> kPos = Position(fS,fT);
Vector3<Real> kNor(kPos.X()-m_fRo*fCosTwoPiS,kPos.Y()-m_fRo*fSinTwoPiS,
kPos.Z());
kNor.Normalize();
return kNor;
}
HalfSpace3<Real>::HalfSpace3 (const Vector3<Real>& rkPoint0,
const Vector3<Real>& rkPoint1, const Vector3<Real>& rkPoint2)
{
Vector3<Real> kEdge1 = rkPoint1 - rkPoint0;
Vector3<Real> kEdge2 = rkPoint2 - rkPoint0;
Vector3<Real> kNormal = kEdge1.UnitCross(kEdge2);
m_afTuple[0] = kNormal.X();
m_afTuple[1] = kNormal.Y();
m_afTuple[2] = kNormal.Z();
m_afTuple[3] = kNormal.Dot(rkPoint0);
}
bool BoundingBox::GetCollisionNormalAndDepth(BoundingBox const& other, Vector3& normal, float& depth) const {
Vector3 mina = Vector3(minX_, minY_, minZ_);
Vector3 maxa = Vector3(maxX_, maxY_, maxZ_);
Vector3 minb = Vector3(other.minX_, other.minY_, other.minZ_);
Vector3 maxb = Vector3(other.maxX_, other.maxY_, other.maxZ_);
// the normal of each face.
static const Vector3 faces[6] = {
Vector3(-1, 0, 0),
Vector3(1, 0, 0),
Vector3(0, -1, 0),
Vector3(0, 1, 0),
Vector3(0, 0, -1),
Vector3(0, 0, 1) };
float distances[6] = {
(maxb.X() - mina.X()),
(maxa.X() - minb.X()),
(maxb.Y() - mina.Y()),
(maxa.Y() - minb.Y()),
(maxb.Z() - mina.Z()),
(maxa.Z() - minb.Z())
};
for (unsigned int i = 0; i < 6; i++) {
if (distances[i] <= 0.0f) {
return false;
}
if ((i == 0) || (distances[i] < depth)) {
normal = faces[i];
depth = distances[i];
}
}
return true;
}
Matrix4 Matrix4::GenerateOrthogonalBaseFromAxis(const Vector3 &aAxis)
{
Vector3 FirstVector = aAxis.NormalisedCopy();
Vector3 SecondVector;
Vector3 ThirdVector;
if(aAxis != Vector3::UnitX)
{
SecondVector = Vector3::UnitX;
}
else
{
SecondVector = Vector3::UnitY;
}
ThirdVector = FirstVector.CrossProduct(SecondVector).NormalisedCopy();
SecondVector = FirstVector.CrossProduct(ThirdVector).NormalisedCopy();
return Matrix4( SecondVector.X(), SecondVector.Y(), SecondVector.Z(), 0,
FirstVector.X(), FirstVector.Y(), FirstVector.Z(), 0,
ThirdVector.X(), ThirdVector.Y(), ThirdVector.Z(), 0,
0, 0, 0, 1);
}
ContEllipsoid3MinCR<Real>::ContEllipsoid3MinCR (int numPoints,
const Vector3<Real>* points, const Vector3<Real>& C,
const Matrix3<Real>& R, Real D[3])
{
// Compute the constraint coefficients, of the form (A[0],A[1]) for
// each i.
std::vector<Vector3<Real> > A(numPoints);
for (int i = 0; i < numPoints; ++i)
{
Vector3<Real> diff = points[i] - C; // P[i] - C
Vector3<Real> prod = diff*R; // R^T*(P[i] - C) = (u,v,w)
A[i].X() = prod.X()*prod.X(); // u^2
A[i].Y() = prod.Y()*prod.Y(); // v^2
A[i].Z() = prod.Z()*prod.Z(); // w^2
}
// TODO: Sort the constraints to eliminate redundant ones. It is clear
// how to do this in ContEllipse2MinCR. How to do this in 3D?
MaxProduct(A, D);
}
//---------------------------------
//
//---------------------------------
void Matrix4::LookAt(const Vector3& pos, const Vector3& look, const Vector3& up)
{
Vector3 zVector = pos - look;
zVector.Normalized();
Vector3 xVector = zVector.Cross( up );
Vector3 yVector = xVector.Cross( zVector );
xVector.Normalized();
yVector.Normalized();
float values[ MATRIX_SIZE ] = {
xVector.X(), yVector.X(), zVector.X(), 0,
xVector.Y(), yVector.Y(), zVector.Y(), 0,
xVector.Z(), yVector.Z(), zVector.Z(), 0,
0, 0, 0, 1
};
Matrix4 lookMatrix( values );
lookMatrix.Translate( Vector3( -pos.X(), -pos.Y(), -pos.Z() ) );
}
void MeshRenderNode::render() {
glPushMatrix();
Vector3* position = getOwner()->getTransform()->getPosition();
glTranslatef(position->X(), position->Y(), position->Z());
Quaternion* orientation = getOwner()->getTransform()->getOrientation();
GLfloat angle;
Vector3 axis;
orientation->ToAxisAngle(axis, angle);
angle = angle/Wm5::Mathf::PI * 180.0f;
glRotatef(angle, axis.X(), axis.Y(), axis.Z());
Vector3* scale = getOwner()->getTransform()->getScale();
glScalef(scale->X(), scale->Y(), scale->Z());
// TODO should be using animation component
int animationFrame = 0;
mesh->setAnimationFrame(animationFrame);
mesh->Render();
glPopMatrix();
}
/**
****************************************************************************************************
\fn void MatrixRotationZ( Matrix &o_matrix, const Vector3 &i_position )
\brief Matrix rotation around Z axis creator
\param o_matrix output matrix
\param i_rotation rotation angle
\return NONE
****************************************************************************************************
*/
void GameEngine::Math::Matrix::MatrixTranslation( Matrix &o_matrix, const Vector3 &i_position )
{
FUNCTION_START;
assert( o_matrix._u32Column == 4 );
assert( o_matrix._u32Row == 4 );
o_matrix = o_matrix.Identity();
o_matrix( 3, 0 ) = i_position.X();
o_matrix( 3, 1 ) = i_position.Y();
o_matrix( 3, 2 ) = i_position.Z();
FUNCTION_FINISH;
}
void Wml::ContAlignedBox (int iQuantity, const Vector3<Real>* akPoint,
Vector3<Real>& rkMin, Vector3<Real>& rkMax)
{
rkMin = akPoint[0];
rkMax = rkMin;
for (int i = 1; i < iQuantity; i++)
{
if ( akPoint[i].X() < rkMin.X() )
rkMin.X() = akPoint[i].X();
else if ( akPoint[i].X() > rkMax.X() )
rkMax.X() = akPoint[i].X();
if ( akPoint[i].Y() < rkMin.Y() )
rkMin.Y() = akPoint[i].Y();
else if ( akPoint[i].Y() > rkMax.Y() )
rkMax.Y() = akPoint[i].Y();
if ( akPoint[i].Z() < rkMin.Z() )
rkMin.Z() = akPoint[i].Z();
else if ( akPoint[i].Z() > rkMax.Z() )
rkMax.Z() = akPoint[i].Z();
}
}
bool KernelCollection::isWithinConvexHull(const kernel::base& k) const
{
NUKLEI_TRACE_BEGIN();
#ifdef NUKLEI_USE_CGAL
using namespace cgal_convex_hull_types;
Vector3 loc = k.getLoc();
if (!deco_.has_key(HULL_KEY))
NUKLEI_THROW("Undefined convex hull. Call buildConvexHull() first.");
return deco_.get< boost::shared_ptr<Convex_hull_3> >(HULL_KEY)->bounded_side
(Point_3(loc.X(), loc.Y(), loc.Z())) != CGAL::ON_UNBOUNDED_SIDE;
#else
NUKLEI_THROW("This function requires CGAL. See http://nuklei.sourceforge.net/doxygen/group__install.html");
#endif
NUKLEI_TRACE_END();
}
void rms::ComputePerpVectors( const Vector3<Real> & vIn,
Vector3<Real> & vOut1, Vector3<Real> & vOut2, bool bInIsNormalized )
{
Wml::Vector3<Real> vPerp(vIn);
if ( ! bInIsNormalized )
vPerp.Normalize();
if ( Wml::Math<Real>::FAbs(vPerp.X()) >= Wml::Math<Real>::FAbs(vPerp.Y())
&& Wml::Math<Real>::FAbs(vPerp.X()) >= Wml::Math<Real>::FAbs(vPerp.Z()) )
{
vOut1.X() = -vPerp.Y();
vOut1.Y() = vPerp.X();
vOut1.Z() = (Real)0.0;
}
else
{
vOut1.X() = (Real)0.0;
vOut1.Y() = vPerp.Z();
vOut1.Z() = -vPerp.Y();
}
vOut1.Normalize();
vOut2 = vPerp.Cross(vOut1);
}
void Camera::Sync3DAudio(Vector3 lookingAt)
{
Vector3 completeAt = Owner()->GetTransform()->Position() + lookingAt;
mListenerProperties.LookAtVector[0] = completeAt.X();
mListenerProperties.LookAtVector[1] = completeAt.Y();
mListenerProperties.LookAtVector[2] = completeAt.Z();
mListenerProperties.UpVector[0] = Owner()->GetTransform()->Up().X();
mListenerProperties.UpVector[1] = Owner()->GetTransform()->Up().Y();
mListenerProperties.UpVector[2] = Owner()->GetTransform()->Up().Z();
mListenerProperties.Position[0] = Owner()->GetTransform()->Position().X();
mListenerProperties.Position[1] = Owner()->GetTransform()->Position().X();
mListenerProperties.Position[2] = Owner()->GetTransform()->Position().X();
mpAudioListener->SetListenerProperties(mListenerProperties);
}
bool
c_CurveClustering::get_recovered_curves(const t_ClusterSet &_cluster_set,
const t_CurveSet &_curve_set,
const t_MatrixSet &_matrix_set,
t_CurveSet &_recovered)
{
size_t n_curves = _curve_set.size();
_recovered.reserve(n_curves);
t_ClusterSet::const_iterator cit = _cluster_set.begin();
t_ClusterSet::const_iterator cit_end = _cluster_set.end();
for (; cit != cit_end; ++cit)
{
/*!< for each cluster */
int index = cit->m_i_center;
const c_Curve &curve = *(_curve_set[index]);
const t_PointSet &controls = curve.get_controls();
size_t n_controls = controls.size();
const std::vector<int> &indices = cit->m_i_data;
std::vector<int>::const_iterator cit_i = indices.begin();
std::vector<int>::const_iterator cit_i_end = indices.end();
for (; cit_i != cit_i_end; ++cit_i)
{
/*!< for each element in the cluster */
const t_Matrix &matrix = _matrix_set[*cit_i];
t_PointSet new_controls(n_controls);
for (size_t i = 0; i < n_controls; ++i)
{
Vector3<t_Real> temp = matrix *
Vector3<t_Real>(controls[i].X(), controls[i].Y(), 1);
new_controls[i] = Vector2<t_Real>(temp.X(), temp.Y());
}
_recovered.push_back(new c_Curve(new_controls));
}
}
return true;
}
void MinBox3<Real>::MinimalBoxForAngles (int iQuantity,
const Vector3<Real>* akPoint, Real afAngle[3], Box3<Real>& rkBox)
{
Real fCos0 = Math<Real>::Cos(afAngle[0]);
Real fSin0 = Math<Real>::Sin(afAngle[0]);
Real fCos1 = Math<Real>::Cos(afAngle[1]);
Real fSin1 = Math<Real>::Sin(afAngle[1]);
Vector3<Real> kAxis(fCos0*fSin1,fSin0*fSin1,fCos1);
Matrix3<Real> kRot(kAxis,afAngle[2]);
Vector3<Real> kMin = akPoint[0]*kRot, kMax = kMin;
for (int i = 1; i < iQuantity; i++)
{
Vector3<Real> kTest = akPoint[i]*kRot;
if ( kTest.X() < kMin.X() )
kMin.X() = kTest.X();
else if ( kTest.X() > kMax.X() )
kMax.X() = kTest.X();
if ( kTest.Y() < kMin.Y() )
kMin.Y() = kTest.Y();
else if ( kTest.Y() > kMax.Y() )
kMax.Y() = kTest.Y();
if ( kTest.Z() < kMin.Z() )
kMin.Z() = kTest.Z();
else if ( kTest.Z() > kMax.Z() )
kMax.Z() = kTest.Z();
}
Vector3<Real> kMid = ((Real)0.5)*(kMax + kMin);
Vector3<Real> kRng = ((Real)0.5)*(kMax - kMin);
rkBox.Center() = kRot*kMid;
rkBox.Axis(0) = kRot.GetColumn(0);
rkBox.Axis(1) = kRot.GetColumn(1);
rkBox.Axis(2) = kRot.GetColumn(2);
rkBox.Extent(0) = kRng.X();
rkBox.Extent(1) = kRng.Y();
rkBox.Extent(2) = kRng.Z();
}
bool c_CurveClustering::standardize(const c_Curve *_p_original_curve,
c_Curve *&_p_standard_curve)
{
/*!< create an oriented bounding box for sample points */
const t_PointSet samples = _p_original_curve->get_samples();
Box2<t_Real> box = ContOrientedBox(samples.size(), samples.data());
/*!< ensure that extends of the box are not too small */
if (box.Extent[0] < epsilon)
{
box.Extent[0] = 1;
}
if (box.Extent[1] < epsilon)
{
box.Extent[1] = 1;
}
/*!< set the affine matrix in the transform, using the box */
Matrix3<t_Real> affine_matrix;
c_Curve::t_Point const &first = samples.front();
__set_affine_matrix(box, Vector3<t_Real>(first.X(), first.Y(), 1),
affine_matrix);
m_affine_matrices.push_back(affine_matrix.Inverse());
/*!< calculate the new standard control points */
const t_PointSet old_controls = _p_original_curve->get_controls();
size_t n_controls = old_controls.size();
t_PointSet new_controls(n_controls);
for (size_t i = 0; i < n_controls; ++i)
{
Vector3<t_Real> temp = affine_matrix *
Vector3<t_Real>(old_controls[i].X(), old_controls[i].Y(), 1);
new_controls[i] = Vector2<t_Real>(temp.X(), temp.Y());
}
_p_standard_curve = new c_Curve(new_controls);
return true;
}
Vector2 CameraRenderNode::convertToWorldCoords(const Vector2& screenCoords) {
if(guiCamera) {
return screenCoords;
} else {
// TODO - this is inefficient as shit, but it works
Vector2 rotatedBounds = getCameraBounds().min;
switch(scene->getSettingsManager()->getRotation()) {
case ROTATION_PORTRAIT:
case ROTATION_PORTRAIT_UPSIDEDOWN:
break;
case ROTATION_LANDSCAPE_COUNTERCLOCKWISE:
case ROTATION_LANDSCAPE_CLOCKWISE:
Vector2 cameraBoundsMin = getCameraBounds().min;
rotatedBounds = Vector2(cameraBoundsMin.Y(), cameraBoundsMin.X());
break;
}
Vector3* pos = owner->getTransform()->getPosition();
return zoomFactor * screenCoords + rotatedBounds + Vector2(pos->X(), pos->Y());
}
}
// http://iphonedevelopment.blogspot.com/2008/10/circles-and-ellipses-in-opengl-es.html
void RenderUtils::drawEllipse(int segments, float width, float height, const Vector2& center, const Vector3& color, bool filled) {
glBindBuffer(GL_ARRAY_BUFFER, 0);
glEnableClientState(GL_VERTEX_ARRAY);
glDisable(GL_TEXTURE_2D);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glPushMatrix();
glTranslatef(center.X(), center.Y(), 0.0);
GLfloat vertices[segments*3];
int count=0;
for (GLfloat i = 0; i < (2*Wm5::Mathf::PI); i+=((2*Wm5::Mathf::PI)/segments))
{
vertices[count++] = (Wm5::Mathf::Cos(i)*width);
vertices[count++] = (Wm5::Mathf::Sin(i)*height);
vertices[count++] = 0.0f;
}
glColor4f (color.X(), color.Y(), color.Z(), 1.0f);
glVertexPointer (3, GL_FLOAT, 0, vertices);
glDrawArrays ((filled) ? GL_TRIANGLE_FAN : GL_LINE_LOOP, 0, segments);
glPopMatrix();
}
Real MinBox3<Real>::Volume (const Real* afAngle, void* pvData)
{
MinBox3& rkSelf = *(MinBox3*)pvData;
Real fCos0 = Math<Real>::Cos(afAngle[0]);
Real fSin0 = Math<Real>::Sin(afAngle[0]);
Real fCos1 = Math<Real>::Cos(afAngle[1]);
Real fSin1 = Math<Real>::Sin(afAngle[1]);
Vector3<Real> kAxis(fCos0*fSin1,fSin0*fSin1,fCos1);
Matrix3<Real> kRot(kAxis,afAngle[2]);
Vector3<Real> kMin = rkSelf.m_akPoint[0]*kRot, kMax = kMin;
for (int i = 1; i < rkSelf.m_iQuantity; i++)
{
Vector3<Real> kTest = rkSelf.m_akPoint[i]*kRot;
if ( kTest.X() < kMin.X() )
kMin.X() = kTest.X();
else if ( kTest.X() > kMax.X() )
kMax.X() = kTest.X();
if ( kTest.Y() < kMin.Y() )
kMin.Y() = kTest.Y();
else if ( kTest.Y() > kMax.Y() )
kMax.Y() = kTest.Y();
if ( kTest.Z() < kMin.Z() )
kMin.Z() = kTest.Z();
else if ( kTest.Z() > kMax.Z() )
kMax.Z() = kTest.Z();
}
Real fVolume = (kMax.X()-kMin.X()) * (kMax.Y()-kMin.Y()) *
(kMax.Z()-kMin.Z());
return fVolume;
}
bool CylinderIntersector<real>::Intersect( const Cylinder<real>* cylinder, const Ray<real>& ray, Intersection<real>& oIntersection )
{
real nearestDistance = std::numeric_limits<real>::max();
real distance = 0;
bool hasIntersection = false;
////////////////////////////////////////////
//////////////////IFT 3355//////////////////
////////////////////////////////////////////
//Ici, vous calculerez l'intersection entre
//le rayon "ray" et le cylindre "cylinder"
//Pensez à initialiser les quatre attributs
//de oIntersection (retourné par référence)
//correctement si une intersection est trouvée.
////////////////////////////////////////////
//////////////////IFT 3355//////////////////
////////////////////////////////////////////
real halfHeight = cylinder->GetHeight() / 2;
real radius = cylinder->GetRadius();
// Intersection with extremeties.
Vector3<real> extremeties[2] = {
Vector3<real>(0, halfHeight, 0),
Vector3<real>(0, -halfHeight, 0),
};
for (int k = 0; k < 2; ++k) {
Vector3<real> plane = extremeties[k];
real denom = ray.GetDirection() * plane;
bool intersectsPlane = fabs(denom) > EPS;
// Ray intersects with the extremety.
if (intersectsPlane) {
// Intersection position on the infinite plane.
real t = ((plane - ray.GetOrigin()) * plane) / denom;
Vector3<real> intersectionPos = ray.GetOrigin() + t * ray.GetDirection();
// Ray intersects in the window.
if ((plane - intersectionPos).Length() <= radius &&
ray.GetDirection() * plane < 0 &&
t > EPS && t <= nearestDistance) {
oIntersection.SetNormal(plane);
oIntersection.SetPosition(intersectionPos);
oIntersection.SetTextureCoordinates(intersectionPos);
oIntersection.IsInside(false);
nearestDistance = t;
hasIntersection = true;
}
}
}
// Intersection with main body
Vector3<real> o = Vector3<real>(ray.GetOrigin().X(), 0, ray.GetOrigin().Z());
Vector3<real> d = Vector3<real>(ray.GetDirection().X(), 0, ray.GetDirection().Z());
real a = d*d;
real b = 2 * d * o;
real c = o * o - (radius*radius);
real discr = b*b - 4*a*c;
if (discr < -EPS) {
return hasIntersection; // No intersection.
}
else {
real t1 = (-b - sqrt(discr)) / (2*a);
real t2 = (-b + sqrt(discr)) / (2*a);
real t = std::min<real>(t1, t2);
Vector3<real> intersectionPos = ray.GetOrigin() + t * ray.GetDirection();
if (t >= EPS && t < nearestDistance && fabs(intersectionPos.Y()) < halfHeight+EPS) {
oIntersection.SetNormal(intersectionPos - Vector3<real>(0, intersectionPos.Y(), 0));
oIntersection.SetPosition(intersectionPos);
oIntersection.SetTextureCoordinates(intersectionPos);
oIntersection.IsInside(false);
nearestDistance = t;
hasIntersection = true;
}
}
return hasIntersection;
}
