//██████████████████████████████████████████████████████████████████████████████████
// reflection with normal
core::vector3df getReflected( core::vector3df vector, core::vector3df normal ) {
f32 length = (f32)vector.getLength();
vector.normalize();
normal.normalize();
return (vector - normal * 2.0f * (vector.dotProduct( normal))) * length;
}
// Copied from irrlicht
void calculateTangents(
core::vector3df& normal,
core::vector3df& tangent,
core::vector3df& binormal,
const core::vector3df& vt1, const core::vector3df& vt2, const core::vector3df& vt3, // vertices
const core::vector2df& tc1, const core::vector2df& tc2, const core::vector2df& tc3) // texture coords
{
core::vector3df v1 = vt1 - vt2;
core::vector3df v2 = vt3 - vt1;
normal = v2.crossProduct(v1);
normal.normalize();
// binormal
f32 deltaX1 = tc1.X - tc2.X;
f32 deltaX2 = tc3.X - tc1.X;
binormal = (v1 * deltaX2) - (v2 * deltaX1);
binormal.normalize();
// tangent
f32 deltaY1 = tc1.Y - tc2.Y;
f32 deltaY2 = tc3.Y - tc1.Y;
tangent = (v1 * deltaY2) - (v2 * deltaY1);
tangent.normalize();
// adjust
core::vector3df txb = tangent.crossProduct(binormal);
if (txb.dotProduct(normal) < 0.0f)
{
tangent *= -1.0f;
binormal *= -1.0f;
}
}
void CFreeCamera::Update(unsigned uDeltaTime)
{
scene::ICameraSceneNode *pCamera = m_pSceneNode;
// Check if dt is not 0 and we are animating active camera
if(!uDeltaTime || pCamera->getSceneManager()->getActiveCamera() != pCamera)
return;
// Calculate some useful vectors
core::vector3df vPos = pCamera->getPosition();
const core::vector3df vForward = (pCamera->getTarget() - pCamera->getPosition()).normalize();
const core::vector3df &vUp = pCamera->getUpVector();
const core::vector3df vRight = vForward.crossProduct(vUp);
float fSpeed = uDeltaTime / 100.0f;
// Shift makes camera faster
if(m_Controls[CTRL_FASTER])
fSpeed *= 5.0f;
// Calculate direction of movement
core::vector3df vMovement(0.0f, 0.0f, 0.0f);
if(m_Controls[CTRL_FORWARD])
vMovement += vForward * fSpeed;
if(m_Controls[CTRL_BACKWARD])
vMovement -= vForward * fSpeed;
if(m_Controls[CTRL_LEFT])
vMovement += vRight * fSpeed;
if(m_Controls[CTRL_RIGHT])
vMovement -= vRight * fSpeed;
// update camera velocity
float fFactor = min(uDeltaTime / 200.0f, 1.0f);
m_vVelocity = vMovement * fFactor + m_vVelocity * (1.0f - fFactor);
vPos += m_vVelocity;
pCamera->setPosition(vPos);
// Update pitch and yaw
if(m_vCursorPos != m_vCursorCenter)
{
core::vector2df vOffset = m_vCursorPos - m_vCursorCenter;
m_fYaw = fmod(m_fYaw + vOffset.X, 2.0f * M_PI);
const float fPitchMax = M_PI_2 - 0.1f;
m_fPitch -= vOffset.Y;
if(m_fPitch > fPitchMax)
m_fPitch = fPitchMax;
else if(m_fPitch < -fPitchMax)
m_fPitch = -fPitchMax;
m_pCursorCtrl->setPosition(0.5f, 0.5f);
m_vCursorCenter = m_pCursorCtrl->getRelativePosition();
}
// Set camera target
core::vector3df vTarget(sinf(m_fYaw) * cosf(m_fPitch), sinf(m_fPitch), cosf(m_fYaw) * cosf(m_fPitch));
vTarget += vPos;
pCamera->setTarget(vTarget);
}
void Vertex::clear()
{
position.set(0,0,0);
normal.set(0,0,0);
color.clear();
texCoords.set(0,0,0);
lmapCoords.set(0,0,0);
}
//! sets the look at target of the camera
//! \param pos: Look at target of the camera.
void CCameraSceneNode::setTarget(const core::vector3df& pos)
{
Target = pos;
if(TargetAndRotationAreBound)
{
const core::vector3df toTarget = Target - getAbsolutePosition();
ISceneNode::setRotation(toTarget.getHorizontalAngle());
}
}
void CBillboardGroupSceneNode::applyVertexShadows( const core::vector3df& lightDir, f32 intensity, f32 ambient )
{
for ( s32 i=0; i<Billboards.size(); i++ )
{
core::vector3df normal = Billboards[i].Position;
normal.normalize();
f32 light = -lightDir.dotProduct(normal)*intensity + ambient;
if ( light < 0 )
light = 0;
if ( light > 1 )
light = 1;
video::SColor color;
color.setRed( (u8)(Billboards[i].Color.getRed() * light) );
color.setGreen( (u8)(Billboards[i].Color.getGreen() * light) );
color.setBlue( (u8)(Billboards[i].Color.getBlue() * light) );
color.setAlpha( Billboards[i].Color.getAlpha() );
for ( s32 j=0; j<4; j++ )
{
MeshBuffer.Vertices[i*4+j].Color = color;
}
}
}
/** This only modifies the relative rotation of the node.
If the camera's target and rotation are bound ( @see bindTargetAndRotation() )
then calling this will also change the camera's target to match the rotation.
\param rotation New rotation of the node in degrees. */
void CCameraSceneNode::setRotation(const core::vector3df& rotation)
{
if(TargetAndRotationAreBound)
Target = getAbsolutePosition() + rotation.rotationToDirection();
ISceneNode::setRotation(rotation);
}
// Copied from irrlicht
static inline core::vector3df getAngleWeight(const core::vector3df& v1,
const core::vector3df& v2,
const core::vector3df& v3)
{
// Calculate this triangle's weight for each of its three vertices
// start by calculating the lengths of its sides
const f32 a = v2.getDistanceFromSQ(v3);
const f32 asqrt = sqrtf(a);
const f32 b = v1.getDistanceFromSQ(v3);
const f32 bsqrt = sqrtf(b);
const f32 c = v1.getDistanceFromSQ(v2);
const f32 csqrt = sqrtf(c);
// use them to find the angle at each vertex
return core::vector3df(
acosf((b + c - a) / (2.f * bsqrt * csqrt)),
acosf((-b + c + a) / (2.f * asqrt * csqrt)),
acosf((b - c + a) / (2.f * bsqrt * asqrt)));
}
void Mesh::clear()
{
flags = 0;
groupId = 0;
visgroupId = 0;
props = "";
color.clear();
position.set(0,0,0);
for(u32 s = 0; s < surfaces.size(); s++)
{
delete surfaces[s];
}
surfaces.clear();
}
core::vector3df RotatePositionByDirectionalVector(core::vector3df vPos, core::vector3df vNormal )
{
//OPTIMIZE Isn't there a much faster way to do this?
//calculate rotated z
core::vector3df vFinal = vNormal * vPos.Z;
//calculate rotation x
vFinal = vFinal + (vNormal.crossProduct(core::vector3df(0,1,0)) * vPos.X);
//y will just be up.. yeah, not really right
vFinal.Y += vPos.Y;
return vFinal;
}
void ShaderOnSetConstants(IShader *shader) override
{
shader->SetPixelConstant("rippleScroll", engine->GetRenderUpdater().GetVirtualTime() * 0.02);
// Are we looking in to the sun?
core::vector3df camVec = maths::rotation_to_direction( engine->GetWorld()->GetCamera()->GetRotation() );
sunDirection.normalize();
f32 dp = camVec.dotProduct(sunDirection);
//f32 brightness = 1.f + 0.5 * dp*dp*dp*dp*dp*dp*dp*dp*dp*dp*dp*dp*dp*dp*dp*dp;
f32 brightness = 1.f + 0.5 * dp*dp*dp*dp*dp*dp*dp*dp*dp*dp;
if (brightness < 1.f || camVec.getDistanceFrom(sunDirection) > 1.f)
brightness = 1.f;
brightness = core::lerp(lastBrightness, brightness,
core::clamp(engine->GetRenderUpdater().GetLastDeltaTime(), 0.f, 1.f));
lastBrightness = brightness;
shader->SetPixelConstant("brightness", brightness);
}
void CameraData::clear()
{
position.set(0,0,0);
pitch = 0;
yaw = 0;
}
/*------------------------------------------------------------------------------
|
| PROCEDURE LAMBERTUNIV
|
| This PROCEDURE solves the Lambert problem for orbit determination and returns
| the velocity vectors at each of two given position vectors. The solution
| uses Universal Variables for calculation and a bissection technique for
| updating psi.
|
| Algorithm : Setting the initial bounds:
| Using -8Pi and 4Pi2 will allow single rev solutions
| Using -4Pi2 and 8Pi2 will allow multi-rev solutions
| The farther apart the initial guess, the more iterations
| because of the iteration
| Inner loop is for special cases. Must be sure to exit both!
|
| Author : David Vallado 303-344-6037 1 Mar 2001
|
| Inputs Description Range / Units
| R1 - IJK Position vector 1 ER
| R2 - IJK Position vector 2 ER
| DM - direction of motion 'L','S'
| DtTU - Time between R1 and R2 TU
|
| OutPuts :
| V1 - IJK Velocity vector ER / TU
| V2 - IJK Velocity vector ER / TU
| Error - Error flag 'ok', ...
|
| Locals :
| VarA - Variable of the iteration,
| NOT the semi or axis!
| Y - Area between position vectors
| Upper - Upper bound for Z
| Lower - Lower bound for Z
| CosDeltaNu - Cosine of true anomaly change rad
| F - f expression
| G - g expression
| GDot - g DOT expression
| XOld - Old Universal Variable X
| XOldCubed - XOld cubed
| ZOld - Old value of z
| ZNew - New value of z
| C2New - C2(z) FUNCTION
| C3New - C3(z) FUNCTION
| TimeNew - New time TU
| Small - Tolerance for roundoff errors
| i, j - index
|
| Coupling
| MAG - Magnitude of a vector
| DOT - DOT product of two vectors
| FINDC2C3 - Find C2 and C3 functions
|
| References :
| Vallado 2001, 459-464, Alg 55, Ex 7-5
|
-----------------------------------------------------------------------------*/
void LambertUniv
(
core::vector3df Ro, core::vector3df R, char Dm, char OverRev, f64 DtTU,
core::vector3df& Vo, core::vector3df& V, char* Error)
{
const f64 TwoPi = 2.0 * core::PI64;
const f64 Small = 0.0000001;
const u32 NumIter = 40;
u32 Loops, i, YNegKtr;
f64 VarA, Y, Upper, Lower, CosDeltaNu, F, G, GDot, XOld, XOldCubed, FDot,
PsiOld, PsiNew, C2New, C3New, dtNew;
/* -------------------- Initialize values -------------------- */
strcpy(Error, "ok");
PsiNew = 0.0;
Vo = core::vector3df(0,0,0);
V = core::vector3df(0,0,0);
CosDeltaNu = Ro.dotProduct(R) / (Ro.getLength() * R.getLength());
if (Dm == 'L')
VarA = -sqrt(Ro.getLength() * R.getLength() * (1.0 + CosDeltaNu));
else
VarA = sqrt(Ro.getLength() * R.getLength() * (1.0 + CosDeltaNu));
/* ---------------- Form Initial guesses --------------------- */
PsiOld = 0.0;
PsiNew = 0.0;
XOld = 0.0;
C2New = 0.5;
C3New = 1.0 / 6.0;
/* -------- Set up initial bounds for the bissection ------------ */
if (OverRev == 'N')
{
Upper = TwoPi * TwoPi;
Lower = -4.0 * TwoPi;
}
else
{
Upper = -0.001 + 4.0 * TwoPi * TwoPi; // at 4, not alw work, 2.0, makes
Lower = 0.001+TwoPi*TwoPi; // orbit bigger, how about 2 revs??xx
}
/* -------- Determine IF the orbit is possible at all ---------- */
if (fabs(VarA) > Small)
{
Loops = 0;
YNegKtr = 1; // y neg ktr
while (1 == 1)
{
if (fabs(C2New) > Small)
Y = Ro.getLength() + R.getLength() - (VarA * (1.0 - PsiOld * C3New) / sqrt(C2New));
else
Y = Ro.getLength() + R.getLength();
/* ------- Check for negative values of y ------- */
if ((VarA > 0.0) && (Y < 0.0))
{
YNegKtr = 1;
while (1 == 1)
{
PsiNew = 0.8 * (1.0 / C3New) *
(1.0 - (Ro.getLength() + R.getLength()) * sqrt(C2New) / VarA);
/* ------ Find C2 and C3 functions ------ */
FindC2C3(PsiNew, C2New, C3New);
PsiOld = PsiNew;
Lower = PsiOld;
if (fabs(C2New) > Small)
Y = Ro.getLength() + R.getLength() -
(VarA * (1.0 - PsiOld * C3New) / sqrt(C2New));
else
Y = Ro.getLength() + R.getLength();
/*
if (Show == 'Y')
if (FileOut != NULL)
fprintf(FileOut, "%3d %10.5f %10.5f %10.5f %7.3f %9.5f %9.5f\n",
Loops, PsiOld, Y, XOld, dtNew, VarA, Upper, Lower);
*/
YNegKtr++;
if ((Y >= 0.0) || (YNegKtr >= 10))
break;
}
}
if (YNegKtr < 10)
{
if (fabs(C2New) > Small)
XOld = sqrt(Y / C2New);
else
XOld = 0.0;
XOldCubed = XOld * XOld * XOld;
dtNew = XOldCubed * C3New + VarA * sqrt(Y);
/* ---- Readjust upper and lower bounds ---- */
if (dtNew < DtTU)
Lower = PsiOld;
if (dtNew > DtTU)
Upper = PsiOld;
PsiNew = (Upper + Lower) * 0.5;
/*
if (Show == 'Y')
if (FileOut != NULL)
fprintf(FileOut, "%3d %10.5f %10.5f %10.5f %7.3f %9.5f %9.5f\n",
Loops, PsiOld, Y, XOld, dtNew, VarA, Upper, Lower);
*/
/* -------------- Find c2 and c3 functions ---------- */
FindC2C3(PsiNew, C2New, C3New);
PsiOld = PsiNew;
Loops++;
/* ---- Make sure the first guess isn't too close --- */
if ((fabs(dtNew - DtTU) < Small) && (Loops == 1))
dtNew = DtTU - 1.0;
}
if ((fabs(dtNew - DtTU) < Small) || (Loops > NumIter) || (YNegKtr > 10))
break;
}
if ((Loops >= NumIter) || (YNegKtr >= 10))
{
strcpy(Error, "GNotConv");
if (YNegKtr >= 10)
strcpy(Error, "Y negative");
}
else
{
/* ---- Use F and G series to find Velocity Vectors ----- */
F = 1.0 - Y / Ro.getLength();
GDot = 1.0 - Y / R.getLength();
G = 1.0 / (VarA * sqrt(Y)); // 1 over G
FDot = sqrt(Y) * (-R.getLength() - Ro.getLength() + Y) / (R.getLength() * Ro.getLength() * VarA);
/*
for (u32 i = 0; i <= 2; i++)
{
Vo[i] = (R[i] - F * Ro[i]) * G;
V[i] = (GDot * R[i] - Ro[i]) * G;
}
*/
Vo.X = (R.X - F * Ro.X) * G;
Vo.Y = (R.Y - F * Ro.Y) * G;
Vo.Z = (R.Z - F * Ro.Z) * G;
V.X = (GDot * R.X - Ro.X) * G;
V.Y = (GDot * R.Y - Ro.Y) * G;
V.Z = (GDot * R.Z - Ro.Z) * G;
}
}
else
strcpy(Error, "impos 180ø");
/*
---- For Fig 6-14 dev with testgau.pas ----
IF Error = 'ok' THEN Write( FileOut,PsiNew:14:7,DtTU*13.44685:14:7 )
ELSE Write( FileOut,' 9999.0 ':14,DtTU*13.44685:14:7 );
*/
}
/*------------------------------------------------------------------------------
|
| PROCEDURE LAMBERBATTIN
|
| This PROCEDURE solves Lambert's problem using Battins method. The method is
| developed in Battin (1987).
|
| Author : David Vallado 303-344-6037 1 Mar 2001
|
| Inputs Description Range / Units
| Ro - IJK Position vector 1 ER
| R - IJK Position vector 2 ER
| DM - direction of motion 'L','S'
| DtTU - Time between R1 and R2 TU
|
| OutPuts :
| Vo - IJK Velocity vector ER / TU
| V - IJK Velocity vector ER / TU
| Error - Error flag 'ok',...
|
| Locals :
| i - Index
| Loops -
| u -
| b -
| Sinv -
| Cosv -
| rp -
| x -
| xn -
| y -
| l -
| m -
| CosDeltaNu -
| SinDeltaNu -
| DNu -
| a -
| Tan2w -
| RoR -
| h1 -
| h2 -
| Tempx -
| eps -
| denom -
| chord -
| k2 -
| s -
| f -
| g -
| fDot -
| am -
| ae -
| be -
| tm -
| gDot -
| arg1 -
| arg2 -
| tc -
| AlpE -
| BetE -
| AlpH -
| BetH -
| DE -
| DH -
|
| Coupling :
| ARCSIN - Arc sine FUNCTION
| ARCCOS - Arc cosine FUNCTION
| MAG - Magnitude of a vector
| ARCSINH - Inverse hyperbolic sine
| ARCCOSH - Inverse hyperbolic cosine
| SINH - Hyperbolic sine
| POWER - Raise a base to a POWER
| ATAN2 - Arc tangent FUNCTION that resolves quadrants
|
| References :
| Vallado 2001, 464-467, Ex 7-5
|
-----------------------------------------------------------------------------*/
void LambertBattin
(
core::vector3df Ro, core::vector3df R, char dm, char OverRev, f64 DtTU,
core::vector3df* Vo, core::vector3df* V, char* Error
)
{
const f64 Small = 0.000001;
core::vector3df RCrossR;
s32 i, Loops;
f64 u, b, Sinv,Cosv, rp, x, xn, y, L, m, CosDeltaNu, SinDeltaNu,DNu, a,
tan2w, RoR, h1, h2, Tempx, eps, Denom, chord, k2, s, f, g, FDot, am,
ae, be, tm, GDot, arg1, arg2, tc, AlpE, BetE, AlpH, BetH, DE, DH;
strcpy(Error, "ok");
CosDeltaNu = Ro.dotProduct(R) / (Ro.getLength() * R.getLength());
RCrossR = Ro.crossProduct(R);
SinDeltaNu = RCrossR.getLength() / (Ro.getLength() * R.getLength());
DNu = atan2(SinDeltaNu, CosDeltaNu);
RoR = R.getLength() / Ro.getLength();
eps = RoR - 1.0;
tan2w = 0.25 * eps * eps / (sqrt(RoR) + RoR *(2.0 + sqrt(RoR)));
rp = sqrt(Ro.getLength()*R.getLength()) * (pow(cos(DNu * 0.25), 2) + tan2w);
if (DNu < core::PI64)
L = (pow(sin(DNu * 0.25), 2) + tan2w ) /
(pow(sin(DNu * 0.25), 2) + tan2w + cos(DNu * 0.5));
else
L = (pow(cos(DNu * 0.25), 2) + tan2w - cos(DNu * 0.5)) /
(pow(cos(DNu * 0.25), 2) + tan2w);
m = DtTU * DtTU / (8.0 * rp * rp * rp);
xn = 0.0; // 0 for par and hyp
chord = sqrt(Ro.getLength() * Ro.getLength() + R.getLength() * R.getLength() -
2.0 * Ro.getLength() * R.getLength() * cos(DNu));
s = (Ro.getLength() + R.getLength() + chord) * 0.5;
Loops = 1;
while (1 == 1)
{
x = xn;
Tempx = See(x);
Denom = 1.0 / ((1.0 + 2.0 * x + L) * (3.0 + x * (1.0 + 4.0 * Tempx)));
h1 = pow(L + x, 2) * ( 1.0 + (1.0 + 3.0 * x) * Tempx) * Denom;
h2 = m * ( 1.0 + (x - L) * Tempx) * Denom;
/* ------------------------ Evaluate CUBIC ------------------ */
b = 0.25 * 27.0 * h2 / pow(1.0 + h1, 3);
u = -0.5 * b / (1.0 + sqrt(1.0 + b));
k2 = k(u);
y = ((1.0 + h1) / 3.0) * (2.0 + sqrt(1.0 + b) /
(1.0 - 2.0 * u * k2 * k2));
xn = sqrt(pow((1.0 - L) * 0.5, 2) + m / (y * y)) - (1.0 + L) * 0.5;
Loops++;
if ((fabs(xn - x) < Small) || (Loops > 30))
break;
}
a = DtTU * DtTU / (16.0 * rp * rp * xn * y * y);
/* -------------------- Find Eccentric anomalies ---------------- */
/* -------------------------- Hyperbolic ------------------------ */
if (a < -Small)
{
arg1 = sqrt(s / (-2.0 * a));
arg2 = sqrt((s - chord) / (-2.0 * a));
/* -------- Evaluate f and g functions -------- */
//Visual Studio misses Hyperbolic Arc
/*
AlpH = 2.0 * asinh(arg1);
BetH = 2.0 * asinh(arg2);
*/
AlpH = 2.0 * log(arg1 + sqrt(arg1 * arg1 + 1.0));
BetH = 2.0 * log(arg2 + sqrt(arg2 * arg2 + 1.0));
DH = AlpH - BetH;
f = 1.0 - (a / Ro.getLength()) * (1.0 - cosh(DH));
GDot = 1.0 - (a / R.getLength()) * (1.0 - cosh(DH));
FDot = -sqrt(-a) * sinh(DH) / (Ro.getLength() * R.getLength());
}
else
{
/* ------------------------- Elliptical --------------------- */
if (a > Small)
{
arg1 = sqrt(s / (2.0 * a));
arg2 = sqrt((s - chord) / (2.0 * a));
Sinv = arg2;
Cosv = sqrt(1.0 - (Ro.getLength()+R.getLength() - chord) / (4.0 * a));
BetE = 2.0 * acos(Cosv);
BetE = 2.0 * asin(Sinv);
if (DNu > core::PI64)
BetE = -BetE;
Cosv = sqrt(1.0 - s / (2.0 * a));
Sinv = arg1;
am = s * 0.5;
ae = core::PI64;
be = 2.0 * asin(sqrt((s - chord) / s));
tm = sqrt(am * am * am) * (ae - (be - sin(be)));
if (DtTU > tm)
AlpE = 2.0 * core::PI64 - 2.0 * asin(Sinv);
else
AlpE = 2.0 * asin(Sinv);
DE = AlpE - BetE;
f = 1.0 - (a / Ro.getLength()) * (1.0 - cos(DE));
GDot = 1.0 - (a / R.getLength()) * (1.0 - cos(DE));
g = DtTU - sqrt(a * a * a) * (DE - sin(DE));
FDot = -sqrt(a) * sin(DE) / (Ro.getLength() * R.getLength());
}
else
{
/* ------------------------- Parabolic -------------------- */
arg1 = 0.0;
arg2 = 0.0;
strcpy(Error, "a = 0 ");
//if (FileOut != NULL)
//fprintf(FileOut, " a parabolic orbit \n");
}
}
/*
for (u32 i = 0; i <= 2; i++)
{
Vo[i] = (R[i] - f * Ro[i])/ g;
V[i] = (GDot * R[i] - Ro[i])/ g;
}
*/
Vo->X = (R.X - f * Ro.X)/ g;
Vo->Y = (R.Y - f * Ro.Y)/ g;
Vo->Z = (R.Z - f * Ro.Z)/ g;
V->X = (GDot * R.X - Ro.X)/ g;
V->Y = (GDot * R.Y - Ro.Y)/ g;
V->Z = (GDot * R.Z - Ro.Z)/ g;
/*
if (strcmp(Error, "ok") == 0)
Testamt = f * GDot - FDot * g;
else
Testamt = 2.0;
*/
//if (FileOut != NULL)
//fprintf(FileOut, "%8.5f %3d\n", Testamt, Loops);
//BigT = sqrt(8.0 / (s * s * s)) * DtTU;
}
/** Computes the delta-v's required to go from r0,v0 to rf,vf.
* @return Total delta-v (magnitude) required.
* @param dt Time of flight
* @param r0 Initial position vector.
* @param v0 Initial velocity vector.
* @param rf Desired final position vector.
* @param vf Desired final velocity vector.
* //pointers to return results
* @param deltaV0 computed Initial delta-V.
* @param deltaV1 computed Final delta-V.
* @param totalV0 computed Initial total-V.
* @param totalV0 computed Final total-V.
*/
void LambertCompute(f64 GM,
core::vector3df r0,
core::vector3df v0,
core::vector3df rf,
core::vector3df vf,
f64 dt,
core::vector3df* deltaV0,
core::vector3df* deltaV1,
core::vector3df* totalV0,
core::vector3df* totalV1)
{
s = 0.0;
c = 0.0;
aflag = false;
bflag = false;
debug_print=true;
f64 tp = 0.0;
f64 magr0 = r0.getLength();
f64 magrf = rf.getLength();
//GM is expected in km^3/s^2
mu = GM / 1000000000.0;
//time of flight expected in seconds
dt *= 86400;
tof = dt;
core::vector3df dr = r0 - (rf);
c = dr.getLength();
s = (magr0 + magrf + c) / 2.0;
f64 amin = s / 2.0;
if(debug_print)
printf("amin = %.9E\n", amin);
f64 dtheta = acos(r0.dotProduct(rf) / (magr0 * magrf));
//dtheta = 2.0 * core::PI64 - dtheta;
if(debug_print)
printf("dtheta = %.9E\n", dtheta);
if (dtheta < core::PI64)
{
tp = sqrt(2.0 / (mu)) * (pow(s, 1.5) - pow(s - c, 1.5)) / 3.0;
}
if (dtheta > core::PI64)
{
tp = sqrt(2.0 / (mu)) * (pow(s, 1.5) + pow(s - c, 1.5)) / 3.0;
bflag = true;
}
if(debug_print)
printf("tp = %.9f\n", tp);
f64 betam = getbeta(amin);
f64 tm = getdt(amin, core::PI64, betam);
if(debug_print)
printf("tm = %.9E\n", tm);
if (dtheta == core::PI64)
{
printf(" dtheta = 180.0. Do a Hohmann\n");
return;
}
f64 ahigh = 1000.0 * amin;
f64 npts = 3000.0;
if(debug_print)
printf("dt = %.9E seconds\n", dt);
if(debug_print)
printf("************************************************\n");
if (dt < tp)
{
printf(" No elliptical path possible \n");
return;
}
if (dt > tm)
{
aflag = true;
}
f64 fm = evaluate(amin);
f64 ftemp = evaluate(ahigh);
if ((fm * ftemp) >= 0.0)
{
printf(" initial guesses do not bound \n");
return;
}
//ZeroFinder regfalsi = new ZeroFinder(this, 10000, 1.0E-6, 1.0E-15);
f64 sma = regulaFalsi(amin, ahigh);
f64 alpha = getalpha(sma);
f64 beta = getbeta(sma);
f64 de = alpha - beta;
f64 f = 1.0 - (sma / magr0) * (1.0 - cos(de));
f64 g = dt - sqrt(sma * sma * sma / mu) * (de - sin(de));
core::vector3df newv0;
core::vector3df newvf;
newv0.X = (rf.X - f * r0.X) / g;
newv0.Y = (rf.Y - f * r0.Y) / g;
newv0.Z = (rf.Z - f * r0.Z) / g;
//if it wont work for you, take away the -1.0 multiplications
//I guess my coordinate system is little screwed...
*deltaV0 = (newv0 - (v0*-1.0))*-1.0;
*totalV0 = (newv0*-1.0);
if(debug_print)
printf("deltav-0 X=%.9f, Y=%.9f, Z=%.9f\n",deltaV0->X,deltaV0->Y,deltaV0->Z);
f64 dv0 = deltaV0->getLength();
f64 fdot = -1.0 * (sqrt(mu * sma) / (magr0 * magrf)) * sin(de);
f64 gdot = 1.0 - (sma / magrf) * (1.0 - cos(de));
newvf.X = fdot * r0.X + gdot * newv0.X;
newvf.Y = fdot * r0.Y + gdot * newv0.Y;
newvf.Z = fdot * r0.Z + gdot * newv0.Z;
//Same here:
//if it wont work for you, take away the -1.0 multiplications
//I guess my coordinate system is little screwed...
*deltaV1 = ((vf*-1.0) - newvf)*-1.0;
*totalV1 = (newvf*-1.0);
if(debug_print)
printf("deltav-f X=%.9f, Y=%.9f, Z=%.9f\n",deltaV1->X,deltaV1->Y,deltaV1->Z);
f64 dvf = deltaV1->getLength();
f64 totaldv = dv0 + dvf;
if(debug_print)
printf("\n\nInitial DeltaV dv0 = %.9f\nFinal DeltaV dvf = %.9f\nTotal DeltaV dv = %.9f\nSemi Major Axis = %.9f\n\n",dv0,dvf,totaldv,sma);
/*debug
printf("************************************************\n");
printf("alpha = %.9f\n",alpha);
printf("beta = %.9f\n",beta);
printf("de = %.9f\n",de);
printf("f = %.9f\n",f);
printf("g = %.9f\n",g);
printf("mu = %.9E\n",mu);
f64 firstPartOfG = sqrt(sma * sma * sma / mu);
f64 secondPartOfG = (de - sin(de));
printf("firstPart = %.9f\n",firstPartOfG);
printf("secondPart = %.9f\n",secondPartOfG);
f64 firstTimesSecond = firstPartOfG * secondPartOfG;
f64 timeMinusfirstTimesSecond = dt - test;
printf("firstTimesSecond = %.9E\n",firstTimesSecond);
printf("timeMinusfirstTimesSecond = %.9f\n",timeMinusfirstTimesSecond);
printf("start X=%.9f, Y=%.9f, Z=%.9f\n",r0.X,r0.Y,r0.Z);
printf("desti X=%.9f, Y=%.9f, Z=%.9f\n\n",rf.X,rf.Y,rf.Z);
printf("start Length: %.9Ef\n",r0.getLength());
printf("desti Length: %.9Ef\n\n",rf.getLength());
*/
}
core::vector3df collideWithWorld(s32 recursionDepth, SCollisionData &colData, core::vector3df pos, core::vector3df vel)
{
f32 veryCloseDistance = colData.slidingSpeed;
if (recursionDepth > 5)
return pos;
colData.velocity = vel;
colData.normalizedVelocity = vel;
colData.normalizedVelocity.normalize();
colData.basePoint = pos;
colData.foundCollision = false;
colData.nearestDistance = FLT_MAX;
double uhel_cos = 90 - acos(colData.normalizedVelocity.dotProduct(vector3df(0, -1, 0).normalize())) * 180.0 / PI;
if (recursionDepth > 0 && vel.getLength() > 0 && vel.Y < 0)
{
if (abs(uhel_cos) < 50)
return pos;
}
//------------------ collide with world
// get all triangles with which we might collide
core::aabbox3d<f32> box(colData.R3Position);
box.addInternalPoint(colData.R3Position + colData.R3Velocity);
box.MinEdge -= colData.eRadius;
box.MaxEdge += colData.eRadius;
s32 totalTriangleCnt = colData.selector->getTriangleCount();
Triangles.set_used(totalTriangleCnt);
core::matrix4 scaleMatrix;
scaleMatrix.setScale(
core::vector3df(1.0f / colData.eRadius.X,
1.0f / colData.eRadius.Y,
1.0f / colData.eRadius.Z));
s32 triangleCnt = 0;
colData.selector->getTriangles(Triangles.pointer(), totalTriangleCnt, triangleCnt, box, &scaleMatrix);
for (s32 i=0; i<triangleCnt; ++i)
if(testTriangleIntersection(&colData, Triangles[i]))
colData.triangleIndex = i;
//---------------- end collide with world
if (!colData.foundCollision)
return pos + vel;
// original destination point
const core::vector3df destinationPoint = pos + vel;
core::vector3df newBasePoint = pos;
if (colData.nearestDistance >= veryCloseDistance)
{
core::vector3df v = vel;
v.setLength( colData.nearestDistance - veryCloseDistance );
newBasePoint = colData.basePoint + v;
v.normalize();
colData.intersectionPoint -= (v * veryCloseDistance);
}
// calculate sliding plane
const core::vector3df slidePlaneOrigin = colData.intersectionPoint;
const core::vector3df slidePlaneNormal = (newBasePoint - colData.intersectionPoint).normalize();
core::plane3d<f32> slidingPlane(slidePlaneOrigin, slidePlaneNormal);
core::vector3df newDestinationPoint =
destinationPoint -
(slidePlaneNormal * slidingPlane.getDistanceTo(destinationPoint));
// generate slide vector
const core::vector3df newVelocityVector = newDestinationPoint -
colData.intersectionPoint;
if (newVelocityVector.getLength() < veryCloseDistance)
return newBasePoint;
//printf("Puvodni delka: %f | nova delka: %f\n", colData.velocity.getLength(), newVelocityVector.getLength());
return collideWithWorld(recursionDepth+1, colData,
newBasePoint, newVelocityVector);
}
void Entity::clear()
{
visgroupId = groupId = 0;
props = "";
position.set(0,0,0);
}
int main()
{
srand((u32)time(0)); // This is to generate random seeds.
IrrlichtDevice* device = createDevice(video::EDT_OPENGL);
CEventReceiver receiver;
device->setEventReceiver(&receiver);
manager = device->getSceneManager();
driver = device->getVideoDriver();
gui::IGUIEnvironment* guienv = device->getGUIEnvironment();
//
// Load tree designs
//
for (s32 i = 0; i<NUM_TREE_DESIGNS; i++)
{
treeDesigns[i].Generator = new CTreeGenerator(manager);
io::IXMLReader* xml = device->getFileSystem()->createXMLReader(treeDesignFiles[i].DesignFile);
treeDesigns[i].Generator->loadFromXML(xml);
xml->drop();
treeDesigns[i].TreeTexture = driver->getTexture(treeDesignFiles[i].TreeTextureFile);
treeDesigns[i].LeafTexture = driver->getTexture(treeDesignFiles[i].LeafTextureFile);
treeDesigns[i].BillTexture = driver->getTexture(treeDesignFiles[i].BillTextureFile);
}
//
// Load leaf shader
//
leafMaterialType = (video::E_MATERIAL_TYPE) driver->getGPUProgrammingServices()->addHighLevelShaderMaterialFromFiles(
"./shaders/leaves.vert",
"main",
EVST_VS_2_0,
"./shaders/leaves.frag",
"main",
EPST_PS_2_0,
0,
EMT_TRANSPARENT_ALPHA_CHANNEL,
0);
//
// Tree scene node
//
tree = new CTreeSceneNode(manager->getRootSceneNode(), manager);
tree->drop();
tree->setMaterialFlag(video::EMF_LIGHTING, lightsEnabled);
//
// Camera
//
scene::ICameraSceneNode* camera = manager->addCameraSceneNodeFPS(0, 100, 100);
camera->setPosition(core::vector3df(23.4f, 233.4f, -150.9f));
//
// Light
//
scene::ILightSceneNode* light = manager->addLightSceneNode(0, core::vector3df(100, 100, 100), video::SColorf(1, 1, 1, 1), 10000.0f);
light->getLightData().AmbientColor.set(0.25f, 0.25f, 0.25f, 0.25f);
lightDir = core::vector3df(-1, -1, -1);
lightDir.normalize();
generateNewTree();
//
// Interface
//
guienv->getSkin()->setColor(gui::EGDC_BUTTON_TEXT, video::SColor(255, 200, 255, 255));
guienv->addStaticText(L"By Asger Feldthaus", core::rect<s32>(10, 40, 100, 60));
guienv->addStaticText(L"F6: Toggle lighting", core::rect<s32>(10, 260, 100, 280));
guienv->addStaticText(L"F7: Previous tree design", core::rect<s32>(10, 280, 100, 300));
guienv->addStaticText(L"F8: Next tree design", core::rect<s32>(10, 300, 100, 320));
guienv->addStaticText(L"F9: Generate new tree", core::rect<s32>(10, 320, 100, 340));
//
// Run loop
//
while (device->run())
{
//
// Render
//
driver->beginScene(true, true, video::SColor(0, 40, 40, 40));
manager->drawAll();
guienv->drawAll();
driver->endScene();
//
// Window caption
//
wchar_t caption[60];
s32 tri = driver->getPrimitiveCountDrawn();
swprintf(&caption[0], 60, L"FPS: %i, Triangles: %i, Vertices: %i", driver->getFPS(), tri, tree->getVertexCount());
device->setWindowCaption(&caption[0]);
//
// Controls
//
if (receiver.TappedKeys[KEY_F6])
{
lightsEnabled = !lightsEnabled;
tree->setMaterialFlag(video::EMF_LIGHTING, lightsEnabled);
if (lightsEnabled)
tree->getLeafNode()->applyVertexShadows(lightDir, 1.0f, 0.25f);
else
tree->getLeafNode()->resetVertexShadows();
}
if (receiver.TappedKeys[KEY_F7])
{
currentTreeDesign--;
if (currentTreeDesign < 0)
currentTreeDesign += NUM_TREE_DESIGNS;
generateNewTree();
}
if (receiver.TappedKeys[KEY_F8])
{
currentTreeDesign = (currentTreeDesign + 1) % NUM_TREE_DESIGNS;
generateNewTree();
}
if (receiver.TappedKeys[KEY_F9])
{
seed = rand();
generateNewTree();
}
if (receiver.TappedKeys[KEY_ESCAPE])
{
device->closeDevice();
}
receiver.reset();
}
//
// Clean up
//
for (s32 i = 0; i<NUM_TREE_DESIGNS; i++)
{
treeDesigns[i].Generator->drop();
}
device->drop();
return 0;
}
