// Rotating sponge
void Anim()
{
static DWORD s_PrevTick = GetTickCount();
DWORD tick = GetTickCount(); // msec
float dt = float(tick - s_PrevTick) / 1000.0f; // sec
if (g_Animate && dt > 0 && dt < 0.2f)
{
Vector3 axis = Vector3::ZERO;
float angle = 0;
AxisAngleFromRotation(axis, angle, g_SpongeRotation);
if (Length(axis) < 1.0e-6f)
axis.v[1] = 1;
angle += g_AnimationSpeed * dt;
if (angle >= 2.0f*FLOAT_PI)
angle -= 2.0f*FLOAT_PI;
else if (angle <= 0)
angle += 2.0f*FLOAT_PI;
g_SpongeRotation = RotationFromAxisAngle(axis, angle);
}
s_PrevTick = tick;
}
void AtmosphereSample::Update(double CurrTime, double ElapsedTime)
{
SampleBase::Update(CurrTime, ElapsedTime);
m_fElapsedTime = static_cast<float>(ElapsedTime);
const auto& SCDesc = m_pSwapChain->GetDesc();
// Set world/view/proj matrices and global shader constants
float aspectRatio = (float)SCDesc.Width / SCDesc.Height;
float3 CamZ = normalize( m_f3CameraDir );
float3 CamX = normalize( cross( float3( 0, 1, 0 ), CamZ ) );
float3 CamY = normalize( cross( CamZ, CamX ) );
m_mCameraView =
translationMatrix( -m_f3CameraPos ) *
ViewMatrixFromBasis( CamX, CamY, CamZ );
// This projection matrix is only used to set up directions in view frustum
// Actual near and far planes are ignored
float FOV = (float)M_PI/4.f;
float4x4 mTmpProj = Projection(FOV, aspectRatio, 50.f, 500000.f, m_bIsDXDevice);
float fEarthRadius = AirScatteringAttribs().fEarthRadius;
float3 EarthCenter(0, -fEarthRadius, 0);
float fNearPlaneZ, fFarPlaneZ;
ComputeApproximateNearFarPlaneDist(m_f3CameraPos,
m_mCameraView,
mTmpProj,
EarthCenter,
fEarthRadius,
fEarthRadius + m_fMinElevation,
fEarthRadius + m_fMaxElevation,
fNearPlaneZ,
fFarPlaneZ);
fNearPlaneZ = std::max(fNearPlaneZ, 50.f);
fFarPlaneZ = std::max(fFarPlaneZ, fNearPlaneZ+100.f);
fFarPlaneZ = std::max(fFarPlaneZ, 1000.f);
m_mCameraProj = Projection(FOV, aspectRatio, fNearPlaneZ, fFarPlaneZ, m_bIsDXDevice);
#if 0
if( m_bAnimateSun )
{
auto &LightOrientationMatrix = *m_pDirLightOrienationCamera->GetParentMatrix();
float3 RotationAxis( 0.5f, 0.3f, 0.0f );
float3 LightDir = m_pDirLightOrienationCamera->GetLook() * -1;
float fRotationScaler = ( LightDir.y > +0.2f ) ? 50.f : 1.f;
float4x4 RotationMatrix = float4x4RotationAxis(RotationAxis, 0.02f * (float)deltaSeconds * fRotationScaler);
LightOrientationMatrix = LightOrientationMatrix * RotationMatrix;
m_pDirLightOrienationCamera->SetParentMatrix(LightOrientationMatrix);
}
float dt = (float)ElapsedTime;
if (m_Animate && dt > 0 && dt < 0.2f)
{
float3 axis;
float angle = 0;
AxisAngleFromRotation(axis, angle, m_SpongeRotation);
if (length(axis) < 1.0e-6f)
axis[1] = 1;
angle += m_AnimationSpeed * dt;
if (angle >= 2.0f*FLOAT_PI)
angle -= 2.0f*FLOAT_PI;
else if (angle <= 0)
angle += 2.0f*FLOAT_PI;
m_SpongeRotation = RotationFromAxisAngle(axis, angle);
}
#endif
UpdateGUI();
}
